2 peltier units in one cabinet.
The lower unit lost thermostat control and on full whack continuously.
I disconected that one and run on the top unit only, but with display
panel and lower unit unpowered the top unit ran at half cock
continuously which was ok for the intended use as a non-freezer box low
power fridge.
Until , as no protection from dripping condensate , condensate drip from
the skyved heatsink physically corroded a pin of a small 78L08 100mA
volt reg., diode checking the whole board cold, main active devices
looked reasonable, fuses and low ohm Rs ok.
I had thought if that top control unit failed at any time I could swap
it for the bottom. Both are marked fanny.com.cn PCB100729K1, MP 011
Replaced the VR and no fan kick, green LED flashes on then off and red
LED on . I swapped control units and the identical green and red LED
function and no fan kick also.
No idea what to expect putting a DVM on both isolated peltier units,
top one on resistance each way was 12 ohm and -1 ohm presumably from the dissimilar metals in series , the lower one 13ohm and -4 ohm which as
far as it goes ,are presumably ok.
Before checking out the output side of the PS active devices AZ494AP and
LM358P , conventional DIP devices, something silly I've overlooked?
I will try the lower unit in isolation tomorrow.

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