LG 50PC3D shuts off... bad caps?

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Hey guys, I swapped out the power board with another one and that fixed the problem. I prefer not to use it since it was pretty expensive, but i will try and run the tests you mentioned. What's the fix for it though? Would it be worth or possible to fix the old board or should i not even bother.

Possibly a cold solder joint or intermittent component - could be tricky. Glad you found the fix...

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Hey guys, I swapped out the power board with another one and that fixed the problem. I prefer not to use it since it was pretty expensive, but i will try and run the tests you mentioned. What's the fix for it though? Would it be worth or possible to fix the old board or should i not even bother.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Alright sounds good.. I'll test out what you told me to on Thursday and hope I can get this thing working by the weekend. Will keep you posted. Thanks!

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Uh oh.. that doesn't sound too promising haha. But, would replacing the whole PSU board do the trick though? Thanks

Possibly. I couldn't guarantee it. I do have a spare main board for the 42PC1D; that's probably the only other cause, and likely to be compatible.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Uh oh.. that doesn't sound too promising haha. But, would replacing the whole PSU board do the trick though? Thanks

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Oh okay I'll take a look and post back on Thursday. I am away till then. Lets hope that's the problem? or the fix is hard for it? Let me know. Thanks!

It's a very difficult problem - not one I'm well experienced with. I hope you can fix it.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Oh okay I'll take a look and post back on Thursday. I am away till then. Lets hope that's the problem? or the fix is hard for it? Let me know. Thanks!

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Sure, where exactly should I be sticking the meter? Thanks.

On the thick multi-way power connector which goes to either sustain board - the boards on the left and right of the TV. There should be a pin marked Vs. Post a pic if unsure.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Sure, where exactly should I be sticking the meter? Thanks.

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Alright it shut off real quick.. so it's something with the PSU for sure?

It certainly sounds like it. With your meter, can you check the high voltage Vs (should be around 190V when running.) If it starts falling THEN the TV clicks off (you should hear a relay click or two) it sounds like a cold joint or controller shut down to me.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Alright it shut off real quick.. so it's something with the PSU for sure?

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Oh its going to be in there. I thought i checked but didnt see it. Ill give it a try. What should i be looking for or doing once in that mode. Let me know. Thanks!

If it shuts off real quick when you turn that on, then somehow the PSU is incapable of supplying all the power, or something is overheating. Possibly a cold solder joint somewhere.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Oh its going to be in there. I thought i checked but didnt see it. Ill give it a try. What should i be looking for or doing once in that mode. Let me know. Thanks!

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Hdmi clicks right off as well... coax stays on for a bit then does the same...

Have you found the White Wash option yet?

Look under MENU -> OPTION -> ISM METHOD -> WHITE WASH

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Yeah i can. I tried that last night and still nothing.

[selldoor]

Re: LG 50PC3D shuts off... bad caps?

If you can now get the menu to stay on can you find a factory reset option?

[akk944]

Re: LG 50PC3D shuts off... bad caps?

Hdmi clicks right off as well... coax stays on for a bit then does the same...

[tom66]

Re: LG 50PC3D shuts off... bad caps?

I didnt notice it either until last night...but no i played around with the menu for a while and nothing happenend.

Do you have a HDMI source? It could be a firmware bug causing it to crash with some video inputs.

[akk944]

Re: LG 50PC3D shuts off... bad caps?

I didnt notice it either until last night...but no i played around with the menu for a while and nothing happenend.

[tom66]

Re: LG 50PC3D shuts off... bad caps?

Okay so I ripped out that board you guys were talking about and a number I got off the board is 68709M0734b. So I know I've been bouncing around a lot, but this sums up most of it.

TV shuts off after a short period of time when there is a active signal.
The TV didn't turn off by itself for over an hour when there was no active signal.
There doesn't seem to be any bad caps on the power board.
Creating a bridge as mentioned earlier on the power board did not fix the problem.
I still have no idea which board is causing the problem!

Let me know if you guys need any more information. Thanks

I didn't realise it didn't shut down with no active signal. If you press MENU with no active signal (to get up the control panel) does it shut down quicker?