Question about LG 50PX5D 50 in. Plasma HDTV

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Hi there I have a lg 50pc3d plasma. It does not turn on. When I power it up it clicks and then clicks again and Turns off. Could that be the power supply? Thanks

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Unplug power cord- safety first!
open backcover
check powersupply- top center right is p.s.
top left side of powersupply you'll see 5 capacitor 3300uF 10V.
see any pop up on top? replace it All with same rate or 16v is O.K.
do not use temperature rate 75c. Use 105C.
if you know how to solder. you save $300 least!

Posted on Mar 15, 2009

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I have an LG 50PC3D. When I'd turn it on, it would power up, then immediately shut off, with a 'pop'. If I tried to turn it back on, it would stay on, but the sound was intermittent for several minutes, then all would be fine. After reading many stories about problems with the capacitors on this TV, I decided to take a look. After you unplug it and remove the back, the power supply board is in the center, with several cable strips plugged into it. You will notice several heat sinks running vertically on the board. On the left side of the board, there are several capacitors, NINE of them are 3300uf 10v 105c, four near the bottom, and five about halfway up, two of them under one of the heatsinks. ALL of them were either domed or split. None of the other caps showed issues. I ordered them from Digikey.com for $1.43 a piece, and got them in two days. After removing 8 screws and the cables, set the board on a pad and removed and replaced each of the nine caps. You have to be careful soldering them back in, the circuits on this board were pretty close, so be neat. Put it all back together, and was thrilled to see it turn right on, no pop, stayed on, sound problem fixed, even the picture seems brighter. After 4 hours on, still fine.... Ordering 18 caps (got a second set) with shipping, $31, three hours playing with a power screwdriver and a soldering iron, tedious, seeing that behemoth power up, priceless.......glad I tried it. Thanks everybody for the information. I'm gonna take my wife out to eat for helping me, thanks to saving $400. By the way, I am a paramedic, not an electronics tech, but somewhat comfortable with the iron. Just a little skill and care and you can do this yourself

Posted on Feb 24, 2012

  • medic511386
    medic511386 Feb 24, 2012

    Oh, yeah, I replaced them with 3300uf 16v 105c 10,000 hour rated.

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How do you know if the capacitors are blown. I have the same poblem and I can't tell.

Posted on Nov 16, 2009

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SOURCE: LG 50PC3D not turning on

Without seeing the unit itself and opening it up/running tests I couldn't tell you exactly what is happening, however I can offer some suggestions as to what it could be.
1) your power supply is bad. That clicking sound is the power relay coming on and going off. 
2) your main board is bad. It handles a lot of your signals for powering on your set. If it's bad, the tv won't turn on correctly as it doesn't recieve all the right signals.
3) your Y or Z boards are bad. These could cause the power supply to go into shutdown if the voltages on these things are too far out of whack. 

Easiest way to tell if you're going to go into your tv is to try to unplug your Y and Z boards and turn it on. If it turns on and stays on chances are one of those two boards are bad. 

Posted on Feb 21, 2009

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The problem is associated with the power supply or the main board since these two parts are responsible in communicating in order to turn the unit on sequentially.
To find which one is the culprit:
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Without seeing the unit itself and opening it up/running tests I couldn't tell you exactly what is happening, however I can offer some suggestions as to what it could be.
1) your power supply is bad. That clicking sound is the power relay coming on and going off. 
2) your main board is bad. It handles a lot of your signals for powering on your set. If it's bad, the tv won't turn on correctly as it doesn't recieve all the right signals.
3) your Y or Z boards are bad. These could cause the power supply to go into shutdown if the voltages on these things are too far out of whack. 

Easiest way to tell if you're going to go into your tv is to try to unplug your Y and Z boards and turn it on. If it turns on and stays on chances are one of those two boards are bad. 

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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.



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Unplug power cord- safety first!
open backcover
check powersupply- top center right is p.s.
top left side of powersupply you'll see 5 capacitor 3300uF 10V.
see any pop up on top? replace it All with same rate or 16v is O.K.
do not use temperature rate 75c. Use 105C.
if you know how to solder. you could save $300 at least! Mahalo!

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