Lg 42pc1d

[kazzy]

Hi all i have got an LG 42PC1D that I have been having problems with for the past year and a half ish, The problem it's self started by the picture being distorted when the TV is first switched on, after a couple of minutes the picture restores it's self to full color. Now last week the TV stopped putting out any picture/really dark. I took the back off the TV and I noticed that 2 caps are swollen on the main power board. any idea's if this would be my problem as I'm a bit of a noob when it comes to TV diagnostics.

Any help would be greatly appreciated.
Cheers Greig

[tom66]

Re: Lg 42pc1d

It's a good idea to replace the capacitors if they are failed. While they may not cause the current issue, they give you a baseline to work from.

Can we see a picture of the current fault... and any chance you took a photo of the fault it had previously?

[kazzy]

Re: Lg 42pc1d

Unfortunately I didn't take a picture of it previously and I have replaced the capacitors this morning and plugged it all back in to no avail :/ just a black screen

[tom66]

Re: Lg 42pc1d

Really dark, so you can see an image, but it is faint?

[kazzy]

Re: Lg 42pc1d

no nothing anymore tried menu and everything but nothing is visible :/

[tom66]

Re: Lg 42pc1d

Do you have a digital multimeter?

[kazzy]

Re: Lg 42pc1d

yes a snap on one

[tom66]

Re: Lg 42pc1d

OK, let's see some pictures of the chassis layout then. Long time since I worked on one of these.

[kazzy]

Re: Lg 42pc1d

[tom66]

Re: Lg 42pc1d

OK, so in the middle of the chassis, you have the power board.

On the left, from your photo, you have the Y-sustain and Y-buffer.

On the right, you have the Z-sustain.

Can you get a close up shot of the power leads going to the Y-sustain from the power supply?

[kazzy]

Re: Lg 42pc1d


Power Board side of the cables

[tom66]

Re: Lg 42pc1d

So, get your meter out, set it on the HIGHEST volt DC scale, probe one of the pins marked V-S (red probe on the pin, black probe on the chassis) and report the reading. Note, the connection to the Y-SUS and Z-SUS must be left in place.

[kazzy]

Re: Lg 42pc1d

will i plug it in and switch it on?

[kazzy]

Re: Lg 42pc1d

189V on both terminals with tv powered on

[JonathanAnon]

Re: Lg 42pc1d

What values are printed on the back of the panel.. ?

[tom66]

Re: Lg 42pc1d

189V is fine for this generation of PDP.

[kazzy]

Re: Lg 42pc1d

any ideas of what I could do now? :/

[tom66]

Re: Lg 42pc1d

You have two fuses on each board, right? See what voltage you get on each end of each fuse.

[kazzy]

Re: Lg 42pc1d

one fuse on each board reads 190V the other reads 60v on each board.

[tom66]

Re: Lg 42pc1d

Both ends?