Appliances Daewoo FRS 2021 fridge shutdown fault

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The discussion centers on a refrigerator/freezer experiencing random shutdowns and a blank display, with power cycling proving ineffective. Users suggest that replacing the motherboard is a common recommendation, but it can be costly and hard to find. A key observation was made when the unit shut down, revealing that the 12V, 16V, and 5V power rails were fluctuating, indicating a faulty power supply. The main issue identified is the inadequately heat-sinked switching controller STR G6352. The solution involves replacing this component and applying heat-sink compound to improve performance and prevent future failures. A full service manual is provided for reference.
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An apparently common fault where the fridge shuts down randomly. I couldn’t find a solution online, so am posting here for others.
Symptoms: Random shutdown of entire fridge/freezer, blank display. Restarts after a variable interval. Power cycling doesn’t seem to help.

Forums etc., suggest ‘replacing motherboard’ (on top) but this is often expensive and may not be available.

I managed to catch it in shutdown, and found the 12V, 16V and 5V rails were pulsing up and down (chirping power supply). When it was running, these rails would sag if lots of fans were running.

The full service manual is here: http://www.de-direct.co.uk/downloadb2b/smref/FRS2021.pdf

The fault is in the power supply:
7CB477AB-FA77-4692-BC94-63E8C72F75CA.png


The switching controller STR G6352 is inadequately heat-sinked. Replace it, and add some heat-sink compound.
 
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