Question about LG 50PC3D 50 in. Plasma Television

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My lg 50pc3d has sound but no picture. There is a loud buzz that seems to be coming from the plasma panel itself from everywhere. i checked the 3 fuses and tested the voltage on the power supply board, proper voltages and fuses good including the surface mount one. The buzz is like an oscillating sound. when I turn on the monitor I see the leds on the board kinda flashing with the oscillating buzz. any help would be great

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

jerryg50
  • 1667 Answers

SOURCE: 50 in LG turns on and then clicks and turns back off

The power supply is going in to protect mode. Most often this is a power supply failure, or a failure on one of the circuit boards that is causing the power supply to go in to protect.

If the power supply fault is not too complicated an experienced tech may be able to service it without changing the compete circuit board.

The tech will service this by substituting boards to determine where the failure is occuring. Then he will change the board to fix the fault.


Jerry G.



Posted on Feb 10, 2009

  • 1 Answer

SOURCE: LG 42PX4MVH PLASMA TV - Sound but no picture.

I have the same issue with my LG 42PC3DVA and I narrowed it down to the Y SUS board. After a little research there are a few items that are prone to go. The ceramic fuses (as you found), sometimes the capacitors on the Y SUS, Z SUS, and power supply go along with them You can tell because thy will be bulged at the top instead of flat. I replaced a few of my capacitors - they are only $0.89 each so it was MUCH cheaper than a board.

The other thing that is common on the Y SUS in particular are the FETs (also called MOSFET). They can be replaced if you are good with a soldering gun but they are static sensitive so be grounded. They are also a bit tricky to test so you may want to do some research on how to determine if this is the issue... or you can just replace the whole board.

Posted on Oct 28, 2009

  • 380 Answers

SOURCE: to make a long story short originally bought the

Sounds like the y sus was blown out but what cause it. Were you careful when you were checking voltages? As long as you didn't short 2 components together, your y sus should be fine. Unless the y buffer up and/or down blew them out. Even the panel could blow it.

Basically you need a scope to adjust the ramps and everything. You can adjust VA and VS with a meter. If you don't have access to a scope, then just start changing the ramps etc by eye. It might take a little bit to get but eventually you'll get it.

Posted on Mar 14, 2010

  • 1 Answer

SOURCE: LG RT-42PX10 plasma - No Display

Power supply on left hand side module. check if heatsinks are cold. possible faulty. fuses and input voltages first check.

Posted on Apr 07, 2010

SOURCE: while checking Vscan voltages on my LG du-42px12x picture died.

I have the same problem the pic went out but have sound. where do i go to get the Yboard? do i need a special number off of it or something? I took it to repair shop and he said it would be like 500 dollarss to repair. but i see all kind of yboards on ebay for like 150?? how do I know what one to buy?

Posted on Aug 08, 2010

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