How to troubleshoot ifb washing machine dler in pcb

I took out the MCU of IFB Serena wx front load washing machine because it had some problem in the PCB. I want to troubleshoot the problem but am not able to check the circuitry. Can anyone help? I am not able to upload the image here.

by Andersonboss
January 05, 2021

90% of the failures (after some time of working) come from electrolytic capacitors. Check if one, close to the power plug, is now with a deformation looking like a hemi-sphere on its top. If possible, check its ESR, which should be relatively high. If so, replace it with a new one, same or better voltage, roughly same capacitance. In fact, place the new one in parallel, keeping the same polarity since it is an electrolytic, with the old one, and check if that solves the problem. If so, make the new cap with a permanent connection and then, remove the old one. As usual, keep in mind that playing with 120 volt AC (if not 240) is really dangerous and that capacitors may retain a dangerous voltage for a long long time.

by vanderghast
January 06, 2021
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