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diyer2018  
#1 Posted : Sunday, June 13, 2021 6:29:13 PM(UTC)
diyer2018

Rank: Member

Groups: Registered
Joined: 6/13/2021(UTC)
Posts: 0
United States

Hello,

The model number is: WM3987 HW
Hard reset didn't work (pressing the buttons on the display panel for 5 seconds and plugging back in).
I opened up the top panel and checked the noise filter input and output with a voltage tester pen and it seems ok.
Also opened up the main PCB and nothing seems to be burned. One of the terminals out of the Main PCB (with 3 wires - red, yellow and black) seems to have power when using the voltage tester pen. The red LED light is not turned on.

Should I try replacing the Main PCB?

Thank you.
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ThatGuy  
#2 Posted : Tuesday, June 15, 2021 12:26:28 PM(UTC)
ThatGuy

Rank: Advanced Member

Groups: Expert
Joined: 7/27/2010(UTC)
Posts: 1,395
United States
Location: near the middle of nowhere

Was thanked: 24 time(s) in 24 post(s)
I don't know much about the LGs, but looking at the pictures of the two boards, both seem to have fuses. I would check them first. Follow the power.

https://www.appliancepar...01ec1006t-ap5251356.html

https://www.appliancepar...r38163341-ap5193084.html
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