LG Plasma 50PA5500

[capkid]

Re: LG Plasma 50PA5500

Which meter are you using? Can you post a link or pic of it?

[dyel]

Re: LG Plasma 50PA5500

There you go.

[capkid]

Re: LG Plasma 50PA5500

Ok, you need to set it to the 200V or 1000V range. VS is usually around 200V, while VA is around 60V. Check the label near the top of your panel for the exact spec.

[Dabbi]

Re: LG Plasma 50PA5500

well I guess I need a new control board. That didn't seem to help at all. No menu would come up :/ I look again at the board and I still couldn't find anything.

[dyel]

Re: LG Plasma 50PA5500

Ok, you need to set it to the 200V or 1000V range. VS is usually around 200V, while VA is around 60V. Check the label near the top of your panel for the exact spec.

Set up to 200V:
- VS: 5.4-6.3
- VA: 0
VA can be seen (5.0-6.5) only when set up 200mV.

[tom66]

Re: LG Plasma 50PA5500

Is that with the Y-sus connected or not?

[dyel]

Re: LG Plasma 50PA5500

Yes, everything is connected.

[capkid]

Re: LG Plasma 50PA5500

Try disconnecting your sustains to see if the voltage comes up on the PSU.

[dyel]

Re: LG Plasma 50PA5500

So, the following happened:
1. Disconnected Z-sus from the power supply - VS - 0, VA - 0 (200V is set up);
2. Disconnected Z-sus from Z-sus board - VS around 3.0, VA - 0;
3. Connected Z-sus, disconnected Y-sus from Y-sus bourd - VS around 3.0, VA - 0;
4. Z-sus and Y-sus connected, the control board is disconnected - VS around 3.0, VA - 0;
After I connected everything back, the TV stopped clicking and VS around 3.0 (versus 5-6 before).

[capkid]

Re: LG Plasma 50PA5500

So, the following happened:
1. Disconnected Z-sus from the power supply - VS - 0, VA - 0 (200V is set up);
2. Disconnected Z-sus from Z-sus board - VS around 3.0, VA - 0;
3. Connected Z-sus, disconnected Y-sus from Y-sus bourd - VS around 3.0, VA - 0;
4. Z-sus and Y-sus connected, the control board is disconnected - VS around 3.0, VA - 0;
After I connected everything back, the TV stopped clicking and VS around 3.0 (versus 5-6 before).

I'm not sure I understand what you did in steps 2 & 3. If you meant to say the following, it appears that your power supply is faulty:

2. Disconnected Z-sus from Y-sus board - VS around 3.0, VA - 0;
3. Connected Z-sus, disconnected Y-sus from power bourd - VS around 3.0, VA - 0;

You can try to repair the power supply or just replace it. It looks like there are quite a few available on eBay for under $25.

[dyel]

Re: LG Plasma 50PA5500

Thanks! Will try to buy a new power supply.
Hope the picture provides more details.

[tom66]

Re: LG Plasma 50PA5500

Those tests with the resistor jumpers in place? If so, bad PSU is likely the cause.

[dyel]

Re: LG Plasma 50PA5500

Hi All! I bought a new (used) power supply, set it and...my TV WORKS!!!! Thanks everybody for your help! It was interesting.

[capkid]

Re: LG Plasma 50PA5500

Cool. I'm glad it worked out for you. If you really want get adventurous, you can try to figure out what's wrong with the original power supply

[dyel]

Re: LG Plasma 50PA5500

It's like an challenge! So, what about some instruction, what should i start with?

[Dabbi]

Re: LG Plasma 50PA5500

good news the new control board fixed it!

[tom66]

Re: LG Plasma 50PA5500

Glad to hear! Thanks for the repair feedback.

[Dabbi]

Re: LG Plasma 50PA5500

Thank you guys for all your help and tips! very much appreciated!

[Fletch]

Re: LG Plasma 50PA5500

Thought I might chime in here on this near dead thread...
I have the same tv and have no picture but do have sound. I updated my lg blu-ray player as i went to shut it off and had no picture the next day when i went to watch tv.
I've gotten as far as applying the jumper to the control board with the ribbon from the main board disconnected and had no test pattern.
What I have noticed is the green led on the control board is flashing long-short-long-short-pause.
Is this a useful indicator?

[tom66]

Re: LG Plasma 50PA5500

Do you have a voltmeter? Maybe a good idea to open your own thread.