Electronics > Repair
Fridge Freezer Board Repair - Transistor
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floobydust:
High failure rate parts on these kind of boards are the capacitive dropper cap, the filter cap and the zener diode.
What do you have for test equipment- something that can read capacitance or DCV? Borrow a friend's multimeter etc.

Check the big blue boxed cap for going low value. Same for the 470uF black electrolytic cap.
ozcar:
I'm sort-of wondering if the compressor is OK.

I see that there are two LEDs on the board, "DL1" (green) and "DL2" (yellow). What do those normally indicate, and what do they show when the fridge is misbehaving?

Uncle Google suggests that the green one might simply indicate that the power is on, in which case you'd expect it to be on steady, not flickering or dim. As for the yellow one, well. who knows, perhaps that means "too darn hot" (and compressor should be running) but still not having the fridge model number makes it hard for us.

Floobydust deserves an award for figuring out that the larger triac is a BT137 - I certainly can't read that in your photo (nor in any other photo I could find). I get tantalisingly close to be able to read the markings on U1, but no cigar there either. Clear photos of both sides of the board please.
factory:
I'm thinking U1 is a custom part. The board has what looks to be a thermistor, this goes to the IC.

The interior lighting switch is external to the board in this model (hence the extra pins on the connector), the video found last night has reed switch fitted to the board instead.

Maybe the LEDs are for fault codes? No way of knowing without full model number & a manual, if they are even mentioned in the customer manual.

David
ozcar:

--- Quote from: factory on August 16, 2024, 08:53:14 pm ---I'm thinking U1 is a custom part. The board has what looks to be a thermistor, this goes to the IC.

--- End quote ---

You could be right about U1, and then the numbers on it probably won't help. Perhaps eagle eyed floobydust could see that already, but I'd still like to know.

I turned up a variant of the board where the incandescent lamp was replaced by a daughter board with LEDs on it, and where U1 is not visible (perhaps changed to an smd on the other side of the board?). That board was marked "www.erselettronica.it" and what could be a part number, but that did not yield anything useful.
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