Lg plasma 60pa5500 picture issues

[Nrollins04]

I have an lg plasma 60pa5500 that the y sustain board burnt up in. I just replaced the y sus board. A picture now comes on but it's not clear and now the tv cuts off shortly after cutting the tv on. When I unplug the power to the y sus board the tv will come on and stay on with sound. Any help is appreciated.

[Shinju]

Re: Lg plasma 60pa5500 picture issues

Check all your voltages as per spec on the sticker inside your panel.

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

I have the gauge to test with and I found the sticker u were referring to but I'm not sure where I touch the gauge to test.

[tom66]

Re: Lg plasma 60pa5500 picture issues

Can you post a picture of your "gauge" (multimeter I presume)

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Here is the meter

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Here is one of the back of the tv.. Having trouble uploading more than one pic at a time

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Bump

[tom66]

Re: Lg plasma 60pa5500 picture issues

Ok for these tests you'll need to set your meter to DC volts (DCV) 1000V scale.

Red lead in Volt/mA jack, black in COM.

Place leads across Vsc and -Vy resistors on Y-sustain. These will be marked usually. The Y-sustain is the large left hand board (looking from the back).

Tell us what you measure.

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

164 hv with the com on the -vy and the volt/ma on the vsc

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Bump

[mmartell]

Re: Lg plasma 60pa5500 picture issues

Tom is looking for two readings. Touch each leg of the SAME resistor for each reading - once for the resistor marked Vsc and again for the resistor marked -Vy.

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

not sure what the little plastic screws that go in to the vac and -vy do but I turned them all the way counter clock wise and it came on and stayed on. But he screen was still not right. Pixels were showing rainbow and still had a big black spot In one corner. Thinking there are two more plastic screws on the y-sis board what can it hurt to turns those as well and the picture appears to be fixed. Can someone tell me what those plastic screws do ? Thanks in advance

[tom66]

Re: Lg plasma 60pa5500 picture issues

It is a bad idea to adjust those controls without knowing what they are supposed to be set to. I hope you remember the original position. Put them back in to that position and test Vsc and -Vy as mmartell suggests.

[MagicSmoke]

Re: Lg plasma 60pa5500 picture issues

Better pics of each board will us help you figure out where to test each voltage.

PSU usually has test points for the VS and VA voltages. Top of board clearly marked. If these are not to spec then other voltages will be off. The value is on the sticker on the panel. Vsc and -Vy are on Y sus, VE is on X sus.

These voltages can be enough to KILL so be careful when testing.

When testing volts on the boards ground lead goes to the metal chassis of TV positive lead to the various test points.

The plastic screws are potentiometers for fine tuning each voltage to spec.

If the volts get too high the panel will be damaged beyond repair.

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Ok thanks. I'll put a pic of y sus board up. When I installed the new y-sus board I turned the plastic screws all he way right thinking I was tighting everything up. I turn them all the way left and everything started working correctly wish I had know what they were from the get go. Glad I came back here to see what u guys said.

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Y-sus

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Main power board

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

X-sus

[Nrollins04]

Re: Lg plasma 60pa5500 picture issues

Voltage settings. If I'm testing correctly VS 216 VA 58 Found the proper test points for those. Vsc is 67 -VY is 63 this is touching one of the legs where the plastic adjustment screw is.

[MagicSmoke]

Re: Lg plasma 60pa5500 picture issues

VS is high adjust vs pot to bring it down to spec. Vsc and -Vy is very low, -Vy looks like it should be -185v .

I'm not familiar enough with the IPM boards to be more helpful but there are people here that will.