LG 60PY3DF shuts off

[tom66]

Re: LG 60PY3DF shuts off

I want to make sure we are talking about the same thing. From the pic you can see the "buttons" from the flash of my camera. From what I see nothing can get stuck since the "buttons" are on a smooth surface so you cannot feel them. Without the flash that section looks like part of the bezel. Thanks

Yeah, I've seen those before - but I'm asking is there a board behind there with anything on them? If you can trace the wires, you could even try unplugging it and seeing if it comes on properly.

[brentkhack]

Re: LG 60PY3DF shuts off

Here is the back of the panel you were talking about. I do not see how to take that out to clean, sorry. I did reconnect the connectors and tried to power on again. Still the same.

[brentkhack]

Re: LG 60PY3DF shuts off

This is a 60" model? Is there only one PSU? I'm a little surprised at how small that is... it's smaller than the one in my 42" plasma!

Check the Vs and Va voltage using a multimeter. Set your meter to 500V, 600V or 1000V DC. Check it while it clicks on.

If it's zero or nearly zero.
- Disconnect mains power
- Unplug Y board (left hand side of TV, from back)
- Check again with mains power
- Disconnect mains power
- Unplug Z board (right hand side of TV, from back)
- Check again with mains power

I just installed a new main PSU and put the multimeter to 600 (highest setting). Unplugged the power connection (red, blue wires) and the multimeter showed 400 and then slowly went down. What would my next step be? Thanks

[tom66]

Re: LG 60PY3DF shuts off

400V is way too high - check the battery in your meter. It should be around 185-195V for LG plasmas.

[brentkhack]

Re: LG 60PY3DF shuts off

I changed battery with new and same results. I did notice when I plug in main power from wall to tv it shoots up to almost 400 then quickly goes down. When it gets to 160 it then very slowly goes down.

[tom66]

Re: LG 60PY3DF shuts off

Something is drastically wrong with the power supply. Does it do the same with either sustain board plugged in?

[brentkhack]

Re: LG 60PY3DF shuts off

I have everything plugged in except the blue/red wire going into main PSU which is where I am checking power. Do I need to unhooked something?

[tom66]

Re: LG 60PY3DF shuts off

I have everything plugged in except the blue/red wire going into main PSU which is where I am checking power. Do I need to unhooked something?

Ah! Sorry, my error. This seems okay - you are checking the mains input. 400V peak is fine during startup, 160V is normal in standby mode. 400V indicates the power-factor correction is working.

I thought you were checking the plasma panel Vs voltage. Have you checked Vs?

[brentkhack]

Re: LG 60PY3DF shuts off

Ah! Sorry, my error. This seems okay - you are checking the mains input. 400V peak is fine during startup, 160V is normal in standby mode. 400V indicates the power-factor correction is working.

I thought you were checking the plasma panel Vs voltage. Have you checked Vs?

I am very new to this and am learning so I am not sure exactly what I am doing, haa haa. But how exactly do I check the Vs voltage and to what board?

[tom66]

Re: LG 60PY3DF shuts off

Can you post a closer pic of the Y SUSTAIN board? It's on the left hand side of the screen looking from the back. It is the big board that connects to the buffers through the actual plasma panel.

[brentkhack]

Re: LG 60PY3DF shuts off

Can you post a closer pic of the Y SUSTAIN board? It's on the left hand side of the screen looking from the back. It is the big board that connects to the buffers through the actual plasma panel.

Let me know if you need more pics.

[tom66]

Re: LG 60PY3DF shuts off

Can you take a clearer pic (try some light in the room to focus better) around the connectors?

[brentkhack]

Re: LG 60PY3DF shuts off

Can you take a clearer pic (try some light in the room to focus better) around the connectors?

Let's see if these are better.

[tom66]

Re: LG 60PY3DF shuts off

Good... Check here.

Set meter to 500, 600 or 1000V DC. If you have an autoranging meter, just set it to V DC.

Connect the black probe to the chassis of the TV, such as a bare screw hole.

Use the red probe to probe one of the pins I've highlighted. Only one is necessary.

Record the voltage. It should be around 185V to 195V for LG plasma panels.

[brentkhack]

Re: LG 60PY3DF shuts off

I have multimeter set to 600 Vdc and when i plugged the main power cord in the multimeter didn't show anything. It was 0.00

[tom66]

Re: LG 60PY3DF shuts off

I have multimeter set to 600 Vdc and when i plugged the main power cord in the multimeter didn't show anything. It was 0.00

Was that when you tried to power it up? (Does it still power up then shut down, or has the fault developed?)

[brentkhack]

Re: LG 60PY3DF shuts off

I have multimeter set to 600 Vdc and when i plugged the main power cord in the multimeter didn't show anything. It was 0.00

I used the black probe to mounting screw hole and the red probe to the very right pin of what you highlighted in red.

[tom66]

Re: LG 60PY3DF shuts off

Just to make sure, are you probing a red wire? With the unit turned on with a picture (if only briefly?) I eventually fixed my LG 42PC1D. It had a similar issue, although it was worse, in that it would shut down within about half a second, with the plasma panel only briefly flickering. It turned out to be an AC detect fault, which was an easy fix, but it took me ages to find it! (It should have been one of the first things I checked, but I missed it somehow.)

I'm trying to figure out if the Vs voltage is dropping, and the unit is shutting down because of this (I've got a Pioneer plasma which does this), or if the AC detect or some fault detect mechanism is interfering.

[brentkhack]

Re: LG 60PY3DF shuts off

Sorry what I checked was the pin on the board which showed 0. I just checked the red wire on the connector itself and it showed 189.

[tom66]

Re: LG 60PY3DF shuts off

Seems good... Does it stay the same when it shuts off?