Samsung RS21DGRS – PCB fault

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    refcol
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    I am working on a RS21DGRS and There is a PCB fault, the powercool switches on and off intermittently causing overcooling and annoying beeping. It stops when I activate the childlock feature but now cant unlock childlock.
    I am thinking it is the main PCB control module at fault, but i have doubts about the display PCB, could someone please advise.

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