I have an LG 50PC3D-UD which I am having problems with the power supply. The previous owner replaced the power supply with an alternate replacement board. I obtained the TV when the Y Buffer boards started to go out.
While I was troubleshooting the system with the back panel off two mosfets overheated and blew the secondary fuse on the power supply. The mosfets also shorted. I replaced both mosfets and the fuse but still no power up.
When I do a power up voltage test I'm not getting 3.4v from 2 connections which I should be. On the pictures those would be p801 2nd 3.4v from bottom, and p802 3.4v. All other voltages show what they should.
I have tested with the Y board disconnected, with the Z board disconnected and also with both boards disconnected.
I also noted that I get no change if I remove the secondary fuse and power on. I've tested the fuse and changed it 3 times just to be sure.
While I was troubleshooting the system with the back panel off two mosfets overheated and blew the secondary fuse on the power supply. The mosfets also shorted. I replaced both mosfets and the fuse but still no power up.
When I do a power up voltage test I'm not getting 3.4v from 2 connections which I should be. On the pictures those would be p801 2nd 3.4v from bottom, and p802 3.4v. All other voltages show what they should.
I have tested with the Y board disconnected, with the Z board disconnected and also with both boards disconnected.
I also noted that I get no change if I remove the secondary fuse and power on. I've tested the fuse and changed it 3 times just to be sure.
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