I took apart the television I've posted about and there is a fuse on the >power supply board and it's blown. It was blown (and the home circuit >breaker was tripped at the same time it iseems) when a helpful neighbor >plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power >supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It >gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an >extra time, but that's not so bad.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
We are 50 miles from nowhere down a rainy winding road.
Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won't have it, and real reapir stores are few
and far between. And I don't want to spend tomorrow night here. I want
to fix this and be done.
In alt.home.repair, on Sat, 12 Mar 2022 20:55:09 +0200, micky <NONONOmisc07@fmguy.com> wrote:
I took apart the television I've posted about and there is a fuse on the >power supply board and it's blown. It was blown (and the home circuit >breaker was tripped at the same time it iseems) when a helpful neighbor >plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power >supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
It seems to be 8 amps. I didn't think they used them that big, but
otoh it's 40amp led screen tv.
We are 50 miles from nowhere down a rainy winding road.
Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won't have it, and real reapir stores are few
and far between. And I don't want to spend tomorrow night here. I want
to fix this and be done.
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world, >supplied by a step-down transformer of limited amperage. 500 watts. (It >gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would >not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or >not, and leave here (where it is too cold for me and too rainy) and come >back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an >extra time, but that's not so bad.
I took apart the television I've posted about and there is a fuse on the power supply board and it's blown. It was blown (and the home circuit breaker was tripped at the same time it iseems) when a helpful neighbor plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an extra time, but that's not so bad.
micky <NONONOmisc07@fmguy.com> wrote
I took apart the television I've posted about and there is a fuse on the
power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
It seems to be 8 amps.
I didn't think they used them that big,
but otoh it's 40amp led screen tv.
We are 50 miles from nowhere down a rainy winding road.
Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won't have it, and real reapir stores are few
and far between. And I don't want to spend tomorrow night here. I want
to fix this and be done.
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that's not so bad.
I took apart the television I've posted about and there is a fuse on the power supply board and it's blown. It was blown (and the home circuit breaker was tripped at the same time it iseems) when a helpful neighbor plugged the 110v tv straight into 220.
What is the purpose of the fuse:
To keep a short circuit in the power supply (or other part of the tv)
from pulling too much current, melting the wire's insulation, and
starting a fire?
Or the opposite, to protect the TV from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts.(It
gives the same wattage for both directions.) Surely even a coldshort
in the tv when the maxiumum supplied power is I guess about5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) andcome
back after I buy the right fuse in a city.
What are the odds it will fail in the next 3 week?
That requires putting the tv back togehteran extra time, but that's not
so bad.
We are 50 miles from nowhere down a rainy winding road.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage.
I took apart the television I've posted about and there is a fuse on the power supply board and it's blown. It was blown (and the home circuit breaker was tripped at the same time it iseems) when a helpful neighbor plugged the 110v tv straight into 220.
What is the purpose of the fuse:
It will be hard to find another fuse. It's a small size ceramic fuse.
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
On 13/3/22 5:55 am, micky wrote:
I took apart the television I've posted about and there is a fuse on the power supply board and it's blown. It was blown (and the home circuit breaker was tripped at the same time it iseems) when a helpful neighbor plugged the 110v tv straight into 220.
What is the purpose of the fuse:To stop your house burning down.
The fuse will usually blow after something else in the TV has failed. If
you bridge the fuse, it will fail harder.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
The transformer has limited amperage because if you overload it, it will
burn out or catch fire.
Get a proper fuse. Buy two, because the first one will probably blow due
to the fault that blew the first one. Use the second after you've fixed
that fault.
I took apart the television I've posted about and there is a fuse on the >>> power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor >>> plugged the 110v tv straight into 220.
What is the purpose of the fuse:
To stop your house burning down.
** Plenty of homes have burned down due to TV set fires that did not blow the fuse.
The question is,
how many have *not* burnt down due to a TV set fire
that didn't happen because the fuse blew?
A fuse in your TV isn't going to stop a meteorite hitting your house either.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
Get a proper fuse. Buy two, because the first one will probably blow due >> to the fault that blew the first one. Use the second after you've fixed
that fault.
** You did see how the "110V" set had been somehow connected to "220V" ??
Massive over voltage on the PSU, electros become voltage clamps and MOSFETs go phufft.
Yep, exactly why I told him not to hope a replacement fuse would fix it.
This seems very important. If there is one that's shorted, it will just
blow the fuse over and over,
and if I've bypassed the fuse....would that
allow enough current to start a fire?
On 3/12/2022 10:55 AM, micky wrote:
I took apart the television I've posted about and there is a fuse on the
power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that's not so bad.
There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the
TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.
On 13/3/22 5:55 am, micky wrote:
I took apart the television I've posted about and there is a fuse on the >>> power supply board and it's blown. It was blown (and the home circuitTo stop your house burning down.
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.
What is the purpose of the fuse:
** Plenty of homes have burned down due to TV set fires that did not blow the fuse.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
The transformer has limited amperage because if you overload it, it will
burn out or catch fire.
** Most have a thermal fuse inside them.
Get a proper fuse. Buy two, because the first one will probably blow due** You did see how the "110V" set had been somehow connected to "220V" ??
to the fault that blew the first one. Use the second after you've fixed
that fault.
Massive over voltage on the PSU, electros become voltage clamps and MOSFETs go phufft.
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F <bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
This seems very important. If there is one that's shorted, it will just
blow the fuse over and over, and if I've bypassed the fuse....would that allow enough current to start a fire?
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo : https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
I took apart the television I've posted about and there is a fuse on the >power supply board and it's blown. It was blown (and the home circuit >breaker was tripped at the same time it iseems) when a helpful neighbor >plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power >supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It >gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an >extra time, but that's not so bad.
We are 50 miles from nowhere down a rainy winding road.
Did you not read the warning above the fuse on that PCB?
"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse". I don't think it could be any clearer.
Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?
--
On 13/03/2022 05:52, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
(snip)
This seems very important. If there is one that's shorted, it will just
blow the fuse over and over, and if I've bypassed the fuse....would that
allow enough current to start a fire?
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
(what url did you forget to insert?!)
Did you not read the warning above the fuse on that PCB?
"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse". I don't think it could be any clearer.
Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?
In alt.home.repair, on Sun, 13 Mar 2022 09:35:12 +0000, Jeff Layman <jmlayman@invalid.invalid> wrote:
On 13/03/2022 05:52, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
(snip)
This seems very important. If there is one that's shorted, it will just >>> blow the fuse over and over, and if I've bypassed the fuse....would that >>> allow enough current to start a fire?
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
(what url did you forget to insert?!)
Who knows! With all the radiation I've gotten ever since I used that off-brand fuse, I can't tell my right hand from my right hand.
Did you not read the warning above the fuse on that PCB?
No. Warnings are for grown-ups.
"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse". I don't think it could be any clearer. >>
Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?
Most fuses go up to 250, don't they?
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
(what url did you forget to insert?!)
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F <bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
I took apart the television I've posted about and there is a fuse on the >>> power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It >>> gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would >>> not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or >>> not, and leave here (where it is too cold for me and too rainy) and come >>> back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an >>> extra time, but that's not so bad.
There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the
TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.
This seems very important. If there is one that's shorted, it will just
blow the fuse over and over, and if I've bypassed the fuse....would that allow enough current to start a fire?
The board has a fee parts that might be a MOV.
They are labeled CY101..., TH101..., UA101 and CP101. There is only
one of the last two.
Are any of these usual abbreviation for a MOV? I've been looking
online for a list of abbreviations that includes these, no luck so far, quicker to ask you, Bob (and others).
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo : https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
I'm the second or third person she's had look at it. It's too big and
heavy to take to a shop, so if I bypass the fuse and fail to note a
shorted MOV and it gets worse, I think she will just take her loss and
buy one.
References to previous thread. The TV has HDMI input (3 interfaces!),
but when she lived in Baltimore she was streaming from Amazon, and I
think that was her current plan. Although I don't understand how. The manual says "INPUT — Repeatedly press to change the source you are
viewing (ANT/CABLE, VIDEO 1, VIDEO 2, ColorStream
HD1, ColorStream HD2, HDMI 1, HDMI 2, HDMI 3, PC)."
Colorstream is their name for separate red, blue, whatever color input. Component! That's it. She can't use that.
Video1 AND 2 are composite, she can't use that.
PC IN — For use when connecting a personal computer. When she lived in Baltimore her PC was in another room and I don't think there was a wire connecting them. I've written her son to try to find out what she is talking about.
Ok, guys, I jumpered the fuse holder with a store-bought 10" jumper wire
and got a big spark (even before I tried to turn the tv on. I guess I
should have anticipated that.)
I thought that was bad until I thought, Well, it uses almost 8 amps and
maybe the alligator clips didn't make a good connection.
So used all three jumper wires and this time no spark, just smoke. :-)
From one of the diodes, based on the brown spot next to it and the
swollen diode.
Plus the alligator clips at one end of two of the jumper wires fell off!
So now it's on to a new board.
The board is discontinued of course, but there are lots for sale at
various places, all about 40 dollars. Whether they are new,
"reconditioned" or used, it's okay by me.
The part number is Toshiba PK101V0830I
But what would be great is to find the 220v version of this. So how
would I find what the part number is for the 220 volt version of this.
I wrote Toshiba to ask what the partnumber would be for 220v, but I
think I wrote Toshiba USA. I can call Toshiba in the US Monday at
8AM. Will they know or should I call some European repairman? I
haven't found a tech support page for anywhere in Europe yet. It looks
like I have but then the page is about all of Toshiba, not just tvs, not
just consumer goods,
Would Toshiba use the same tv model# 40RV525U for its 220volt model? I
doubt it, and I can't guess what it would be.
What should I do next? (Helpful answers only, please.)
In alt.home.repair, on Sat, 12 Mar 2022 20:55:09 +0200, micky <NONONOmisc07@fmguy.com> wrote:
I took apart the television I've posted about and there is a fuse on the
power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that's not so bad.
We are 50 miles from nowhere down a rainy winding road.
On 3/13/2022 7:46 AM, micky wrote:
In alt.home.repair, on Sun, 13 Mar 2022 09:35:12 +0000, Jeff Layman <jmlayman@invalid.invalid> wrote:
On 13/03/2022 05:52, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
(snip)
This seems very important. If there is one that's shorted, it will just >>> blow the fuse over and over, and if I've bypassed the fuse....would that >>> allow enough current to start a fire?
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had >>> found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
(what url did you forget to insert?!)
Who knows! With all the radiation I've gotten ever since I used that off-brand fuse, I can't tell my right hand from my right hand.
Did you not read the warning above the fuse on that PCB?
No. Warnings are for grown-ups.
"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse". I don't think it could be any clearer. >>
Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?
Most fuses go up to 250, don't they?
I can't remember ever seeing a "120V" fuse. The basic configuration of
old fashioned fuses will handle 250V fine. How/why would they make them "120V" fuses.
On 3/12/2022 9:52 PM, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
I took apart the television I've posted about and there is a fuse on the >>>> power supply board and it's blown. It was blown (and the home circuit >>>> breaker was tripped at the same time it iseems) when a helpful neighbor >>>> plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power >>>> supply (or other part of the tv) from pulling too much current, melting >>>> the wire's insulation, and starting a fire?
Or the opposite, to protect the TV >>>> from surges.
It will be hard to find another fuse. It's a small size ceramic fuse. >>>> I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It >>>> gives the same wattage for both directions.) Surely even a cold short >>>> in the tv when the maxiumum supplied power is I guess about 5 amps would >>>> not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or >>>> not, and leave here (where it is too cold for me and too rainy) and come >>>> back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an >>>> extra time, but that's not so bad.
There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the
TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.
This seems very important. If there is one that's shorted, it will just
blow the fuse over and over, and if I've bypassed the fuse....would that
allow enough current to start a fire?
The board has a fee parts that might be a MOV.
They are labeled CY101..., TH101..., UA101 and CP101. There is only
one of the last two.
Are any of these usual abbreviation for a MOV? I've been looking
online for a list of abbreviations that includes these, no luck so far,
quicker to ask you, Bob (and others).
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
I'm the second or third person she's had look at it. It's too big and
heavy to take to a shop, so if I bypass the fuse and fail to note a
shorted MOV and it gets worse, I think she will just take her loss and
buy one.
If the fuse did its job fast enough, the MOV, if any, may be fine.
A little light reading
https://www.homemade-circuits.com/how-to-select-mov/
References to previous thread. The TV has HDMI input (3 interfaces!),
but when she lived in Baltimore she was streaming from Amazon, and I
think that was her current plan. Although I don't understand how. The
manual says "INPUT — Repeatedly press to change the source you are
viewing (ANT/CABLE, VIDEO 1, VIDEO 2, ColorStream
HD1, ColorStream HD2, HDMI 1, HDMI 2, HDMI 3, PC)."
Colorstream is their name for separate red, blue, whatever color input.
Component! That's it. She can't use that.
Video1 AND 2 are composite, she can't use that.
Smart TVs can stream directly through their WiFi or ethernet cable
connector. A streaming box, like an Amazon Fire TV, can be plugged into
any HDMI input of older TVs to do the same.
Used 50" TV's are easy to find these days for $50, or often free in my
local Craigslist. I picked up a 55" 4K TV with just a little screen burn
for $75 a few weeks ago.
PC IN — For use when connecting a personal computer. When she lived in
Baltimore her PC was in another room and I don't think there was a wire
connecting them. I've written her son to try to find out what she is
talking about.
In article <5esp2hpfn7o6snpjv8fr9tr1b01v6jvk0l@4ax.com>, NONONOmisc07 >@fmguy.com says...
You cannot mean 40 amps, surely? Even at only 110 volts that is still
quite a powerful heater! 40 inches, perhaps?
In alt.home.repair, on Sun, 13 Mar 2022 09:07:50 -0700, Bob F <bobnospam@gmail.com> wrote:
On 3/12/2022 9:52 PM, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:
On 3/12/2022 10:55 AM, micky wrote:
I took apart the television I've posted about and there is a fuse on the >>>>> power supply board and it's blown. It was blown (and the home circuit >>>>> breaker was tripped at the same time it iseems) when a helpful neighbor >>>>> plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power >>>>> supply (or other part of the tv) from pulling too much current, melting >>>>> the wire's insulation, and starting a fire?
Or the opposite, to protect the TV >>>>> from surges.
It will be hard to find another fuse. It's a small size ceramic fuse. >>>>> I can post the size after I f ind a lamp and a magnifying glass, but >>>>> it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?) >>>>>
If the purpose of the fuse is only to protect the tv, I'm willing to >>>>> take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world, >>>>> supplied by a step-down transformer of limited amperage. 500 watts. (It >>>>> gives the same wattage for both directions.) Surely even a cold short >>>>> in the tv when the maxiumum supplied power is I guess about 5 amps would >>>>> not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or >>>>> not, and leave here (where it is too cold for me and too rainy) and come >>>>> back after I buy the right fuse in a city. What are the odds it will >>>>> fail in the next 3 week? That requires putting the tv back togehter an >>>>> extra time, but that's not so bad.
There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the >>>> TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.
This seems very important. If there is one that's shorted, it will just >>> blow the fuse over and over, and if I've bypassed the fuse....would that >>> allow enough current to start a fire?
The board has a fee parts that might be a MOV.
They are labeled CY101..., TH101..., UA101 and CP101. There is only
one of the last two.
Are any of these usual abbreviation for a MOV? I've been looking
online for a list of abbreviations that includes these, no luck so far,
quicker to ask you, Bob (and others).
Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]
I'm the second or third person she's had look at it. It's too big and
heavy to take to a shop, so if I bypass the fuse and fail to note a
shorted MOV and it gets worse, I think she will just take her loss and
buy one.
If the fuse did its job fast enough, the MOV, if any, may be fine.
I guess it didn't. I might not have said this because I distrust some
of the reports I've gotten but did I mention that the whole house went
dark when this first happened? So I guess it wasn't fast enough.
A little light reading
https://www.homemade-circuits.com/how-to-select-mov/
Bedtime.
References to previous thread. The TV has HDMI input (3 interfaces!),
but when she lived in Baltimore she was streaming from Amazon, and I
think that was her current plan. Although I don't understand how. The >>> manual says "INPUT — Repeatedly press to change the source you are
viewing (ANT/CABLE, VIDEO 1, VIDEO 2, ColorStream
HD1, ColorStream HD2, HDMI 1, HDMI 2, HDMI 3, PC)."
Colorstream is their name for separate red, blue, whatever color input.
Component! That's it. She can't use that.
Video1 AND 2 are composite, she can't use that.
Smart TVs can stream directly through their WiFi or ethernet cable
connector. A streaming box, like an Amazon Fire TV, can be plugged into
any HDMI input of older TVs to do the same.
She claimed she needed no box. I'll ask her son.
Used 50" TV's are easy to find these days for $50, or often free in my
local Craigslist. I picked up a 55" 4K TV with just a little screen burn
for $75 a few weeks ago.
I looked for thrift shops but I haven't looked on Craiglist. That's
where I got an apartment one year, but this year the closest roommates
wanted were 100's of miles away. Maybe covid is responsible somehow.
PC IN — For use when connecting a personal computer. When she lived in >>> Baltimore her PC was in another room and I don't think there was a wire
connecting them. I've written her son to try to find out what she is
talking about.
In alt.home.repair, on Sat, 12 Mar 2022 19:58:22 -0000, Mike Coon <gravity@mjcoon.plus.com> wrote:
In article <5esp2hpfn7o6snpjv8fr9tr1b01v6jvk0l@4ax.com>, NONONOmisc07
@fmguy.com says...
You cannot mean 40 amps, surely? Even at only 110 volts that is still
quite a powerful heater! 40 inches, perhaps?
yes 40 inches!!
Hi Micky,
Twice the voltage in something not prepared for it is a crap shoot to
fix.
And sounds like you have taken a US television abroad?
Used 50" TV's are easy to find these days for $50, or often free in my
local Craigslist. I picked up a 55" 4K TV with just a little screen burn
for $75 a few weeks ago.
Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?
I think 'Micky' uses a random generator to bring up all these questions.
He doesn't even want an answer. He just wants to roil up the newsgroups.
This isn't the only newsgroup he does this random question generation on.
I think he does it for fun but we'd have to ask him why he does it.
I think 'Micky' uses a random generator to bring up all these questions.
He doesn't even want an answer. He just wants to roil up the newsgroups.
This isn't the only newsgroup he does this random question generation on.
I think he does it for fun but we'd have to ask him why he does it.
I took apart the television I've posted about and there is a fuse on the power supply board and it's blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor plugged the 110v tv straight into 220.
What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire's insulation, and starting a fire?
Or the opposite, to protect the TV
from surges.
It will be hard to find another fuse. It's a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it's probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)
If the purpose of the fuse is only to protect the tv, I'm willing to
take the risk, wrap the fuse in tinfoil and put it back together.
If it's to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.
Right?
The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that's not so bad.
We are 50 miles from nowhere down a rainy winding road.
The purpose of a fuse is for protection of the consumer (or consumer's house)
in the event of any electrical failure beyond the comprehension of the consumer.
The fuse is designed to open up even with the slightest of problems. Safety first.
The circuits start out as AC (alternating current) power and have to go through
a few power conversions. There is AC to DC conversion and AC to AC conversion.
In your case, it sounds like you had an over-voltage
condition (a form of overload on the input power, or a form of a power surge).
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