Re: Whirlpool Refrigerator LED lights flickering

My 5 and half year old fridge LED started flashing.

This what I have done / observed,

Removed and visually inspected AC board. The only thing I noticed was that only one digit of R15's resistor code was visible, as the conformal coating was discoloured

Left the board outside the fridge, for a week, and then reinstalled. It worked properly, no flashing. Tried again, an hour latter and flashing returned.

Following day, decided to see how long the LEDs would flash for, and...

Re: Whirlpool Refrigerator LED lights flickering

Redwire, thanks for the response and information.

You confirmed my suspicions, I did not like the fact that the base of Q3 was shorted to ground.

R19 code is 78A, so looks like 634 Ohms.

I don't know how much credence to apply to the information in the video that indicated Q2 has the markings “ON P2F”, which a google search identifies as a PNP transistor. Since the PCB board markings for Q2 is “Q” I assume it is a transistor or possibly a MOSFET.

What type of pictures...

Re: Whirlpool Refrigerator LED lights flickering



Thanks for posting the link to the video.

I don't think the circuit diagram shown in the video is an accurate representation of the LED driver circuit. At the end of the video you can see that 123mA of current flowing out of the "AC Board". This amount of current a reasonable amount of current to drive 1/2 Watt LEDs, but excessive for R15 a 1/8 Watt resistor. The maximum current through R15 should be 30 mA....