LG 60PG3000-ZA faulty, mal discharge?

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Little update on this T.V. Recently got round to replacing the Y-SUS, Z-SUS, and main logic board (did it all in one go) and the problem still persists. Just wondering if those of you experienced with plasma repair would at this stage be assuming the panel itself is bad?

Cheers, Davie.

Did you replace the control board? (Was the main logic the one with the AV inputs)

How are the fuses on the sustain boards?

What about the Vs and Va voltages?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Hi Tom66, cheers for the reply.

1. Yes replaced the main logic control board. The AV board with inputs is separate.

2. Fuses on the sustain boards are good.

3. Vs was reading 229 and Va 85. Tried to adjust them down but the Vs pot wont go any lower than 209 (fully turned) and the Va pot no lower than 70 (the Va causes the telly to shutdown anything below that).

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

What does the ratings sticker say? 229V sounds very high for a plasma, but it is a 60", so it might be necessary for a larger screen.

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Ratings sticker is Va 60 and Vs 192. The original readings I took before replacing the boards where pretty much spot on.

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Ratings sticker is Va 60 and Vs 192. The original readings I took before replacing the boards where pretty much spot on.

I'm guessing this is a 60" from the model?

Do you have exactly the same problem as before?

Careful running it for extended periods of time with a 229V Vs, as that is too high. It could damage the boards as they are rated to 200V max.

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Yes it's the 60".

Problem is the exact same as before.

I am with you there! lol.

Just don't really know where to go from here. Plasma's are not my forte and this unit has me bamboozled with what I want to be doing next. If it where an LCD, laptop, or games console I would have concluded by now whether or not I should continue or cut my losses, just wish there was a decisive way of knowing if the panel is bad.

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Yes it's the 60".

Problem is the exact same as before.

I am with you there! lol.

Just don't really know where to go from here. Plasma's are not my forte and this unit has me bamboozled with what I want to be doing next. If it where an LCD, laptop, or games console I would have concluded by now whether or not I should continue or cut my losses, just wish there was a decisive way of knowing if the panel is bad.

I can tell you as long as you have discharge in the panel and do not have any black bars, it is good.

If you disconnect the cable from the AV board to the control board, do you get no image or the same image?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Disregard those readings previous readings. Half asleep and had meter on wrong setting. It's reading Vs 190 and Va 60, so all the same there.

Don't know if this is much help but if I disconnect the main AV board it doesn't turn itself back off again. still displays mal-discharge on screen but unit stays on.

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

With the cable disconnected I get no image on screen. Unit stays on (green LED on front stays light).

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

With the cable disconnected I get no image on screen. Unit stays on (green LED on front stays light).

Okay I'm thinking it's a problem with the AV board, do you get sound?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Yes, it has sound.

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Yes, it has sound.

Can you post a close up picture of the control board (not the AV board)?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Not tonight but I can get one sorted, keep in mind this is a replacement control board and it still shows the same symptoms as before.

Got a question for you. If the AV board is bad would you get mal-discharge on the screen like in my case, purely discharge with no image present behind it? You have got me wondering what you would expect to see on screen if the AV board was completely kaput on the video end, as everything you read on discharge always blames one of the SUS boards.

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Not tonight but I can get one sorted, keep in mind this is a replacement control board and it still shows the same symptoms as before.

Got a question for you. If the AV board is bad would you get mal-discharge on the screen like in my case, purely discharge with no image present behind it? You have got me wondering what you would expect to see on screen if the AV board was completely kaput on the video end, as everything you read on discharge always blames one of the SUS boards.

I'd expect either no display or corrupted display, not what you are seeing.

I'm hoping there's a test generator on the logic board, place a jumper to enter test mode or similar.

It could also be a buffers issue... does this TV have one or two buffers?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Pretty sure it has three. Left, center, right.

I tried to enter test mode with the previous logic board. Test mode didn't display.

[tom66]

Re: LG 60PG3000-ZA faulty, mal discharge?

Pretty sure it has three. Left, center, right.

I tried to enter test mode with the previous logic board. Test mode didn't display.

Buffers on the right of the screen connected to Y-sus. Someone on this forum had a problem with them causing similar symptoms on an LG.

I was hoping there would be a test mode option but looks like you tried that already?

[cellphonebooster]

Re: LG 60PG3000-ZA faulty, mal discharge?

ahaa !!!

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

Buffers on the right of the screen connected to Y-sus. Someone on this forum had a problem with them causing similar symptoms on an LG.

I was hoping there would be a test mode option but looks like you tried that already?

Cheers Tom. I will look into it!

Yeah, I tried putting it into test mode previously and it didn't work, nothing appeared on screen. That along with what we had been discussing really had me starting to think that you were right about the AV board/SSB board. was beginning to think it could be similar to an LCD problem solving wishful thinking probably! this is plasma! hahaha.

if your interested here is a link to the LG service manual for this T.V.

http://elektrotanya.com/lg_60pg3000.pdf/download.html

If you have a look at the repair flow charts and you can decipher the broken English! it refers to replacing the VSC board for symptoms similar to mine. An internet search was showing what they were referring to as the "VSC board" was the AV board/SSB board. but then it just gets confusing as there seems to be five buffer boards on this T.V but LG call the two connected to the Y-SUS - scan drive boards, and the bottom three are buffers. Plasma terminology is brutal! The manual has me even more confused problem solving wise.

You wouldn't have a link to the guy that had similar problems with his LG would you?

[py3m4n]

Re: LG 60PG3000-ZA faulty, mal discharge?

@Tom.

With both of the Y-SUS buffers disconnected from the Y-SUS the same symptoms are present and the Vsc and Vy test points on the Y-SUS still read as unstable like I had mentioned earlier to rayrod. What I am wondering is what should I expect from the Vsc and Vy with both the Y-SUS buffers disconnected? should I get a stable reading or an unstable one because they are not connected. If it is unstable connected or not, and the symptoms are the same, would this not rule them out as the problem? or am I over simplifying it and confusing myself? hahahahaha!!