LG Plasma 60pk950-UA no picture or sound

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

I am having a similar issue with my 50PZ570. when I short out the 2 holes as in this post, the screen goes completely white. should there be different colours?

Yes after a few seconds it should cycle thru some coloirs

[jt.]

Re: LG Plasma 60pk950-UA no picture or sound

OK, that's good.

See attachment.

With TV OFF and UNPLUGGED:
- Disconnect the blue highlighted cable, by pressing each clip gently and pulling backwards with minimal force.
- Place a wire link between the two holes marked in red.

Then plug TV in and turn on if it is in standby.

You may or may not see test patterns, but if you do, it indicates the main board is bad (not this board... the board with HDMI etc.)

I am having a similar issue with my 50PZ570. when I short out the 2 holes as in this post, the screen goes completely white. should there be different colours?

[crabn]

Re: LG Plasma 60pk950-UA no picture or sound

Received Y up buffer and put it in. TV is working perfectly now.

[crabn]

Re: LG Plasma 60pk950-UA no picture or sound

I don't mean to piggy back on anybody's thread but I am pretty new to this and can't figure out how to post my own thread so sorry but I have a lg 60pk 750 has no picture or sound any help would be great thanks

I have the same model which has no sound or picture. Followed the troubleshoot by Tom66 and I found the Y-sus is bad first. Replaced Y-sus and found the Y low buffer is bad. Replaced Y low buffer, got perfect picture at lower part of screen and found the Y up buffer is bad as well. Ordered the Y up buffer. It should fix my TV for sure.

[Ad9360]

Re: LG Plasma 60pk950-UA no picture or sound

If that board is bad like you said, will it affect the whole functionality of the TV?

[Ad9360]

Re: LG Plasma 60pk950-UA no picture or sound

OK, that's good.

See attachment.

With TV OFF and UNPLUGGED:
- Disconnect the blue highlighted cable, by pressing each clip gently and pulling backwards with minimal force.
- Place a wire link between the two holes marked in red.

Then plug TV in and turn on if it is in standby.

You may or may not see test patterns, but if you do, it indicates the main board is bad (not this board... the board with HDMI etc.)

So I did this on my girlfriends TV and I got the test patterns. So I know its not the power supply because the tv stays on, and if you say test patterns mean that the main board is good and the board with all the Inputs on it is bad. Why when I his the volume button or inout button I still get nothing on the screen?

[Hawkp123]

Re: LG Plasma 60pk950-UA no picture or sound

I don't mean to piggy back on anybody's thread but I am pretty new to this and can't figure out how to post my own thread so sorry but I have a lg 60pk 750 has no picture or sound any help would be great thanks

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

OK, Thanks again for your help.

[newtothis]

Re: LG Plasma 60pk950-UA no picture or sound

Since there are test patterns and with the possibility it was hit with a power surge.. Mainboard failure

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

Reseated both ends of LVDS. As far as a power sure I don't know. A while back the HDMI port on my DirecTV DVR burnt out and they assumed it was a power surge.

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

Before you rule main board out make sure LVDS (cable between main and control) is seated properly both ends. Did the TV experience a power surge of some kind? It could have damaged the main board then taken out the Y-buffer, but that is quite rare.

Note: Main board is the one with HDMI on it.

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

OK, that's good.

See attachment.

With TV OFF and UNPLUGGED:
- Disconnect the blue highlighted cable, by pressing each clip gently and pulling backwards with minimal force.
- Place a wire link between the two holes marked in red.

Then plug TV in and turn on if it is in standby.

You may or may not see test patterns, but if you do, it indicates the main board is bad (not this board... the board with HDMI etc.)

Ok, I did this again and my screen starts changing colors. So I assume the main board is bad too?

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

Got my buffer board today and intalled it. -Vy,Vsc voltages good now. Still no picture. Any ideas?

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

Hi, my lg 50pg20d has same problem still not fixed yet but i can offer some info. Not so expert technician said it was a fault on z sus and changed 2 transisters which made the tv worse then i got no green/red switch on light..... Told him to put back original ones this was not the problem.
Hope this helps

Please post in a separate thread. You have an entirely different model of TV.

[CHOOKY]

Re: LG Plasma 60pk950-UA no picture or sound

Hi, my lg 50pg20d has same problem still not fixed yet but i can offer some info. Not so expert technician said it was a fault on z sus and changed 2 transisters which made the tv worse then i got no green/red switch on light..... Told him to put back original ones this was not the problem.
Hope this helps

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

Great, replace the lower Y-buffer and your TV should be fixed. You could donate a few bucks to the service manual's site in my signature (http://www.toms-service-manuals.com/) or buy some capacitors from badcaps.net for your next project. I don't know if topcat takes donations directly, but you could PM him to ask...

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

The Vsc and -Vy are written on the plasma panel, see the documentation previously linked for how to read the PDP60R1 label.

If the Vsc and -Vy measure correctly with the buffers in place and all connections correct, you should be able to see a little glow from the screen.

Ok, its the lower buffer. With it unhooked the voltages are good and the top half of the screen has a faint white glow. Thanks a million for your help. Also is there a way to donate to the forum or to you for the great service provided?

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

The Vsc and -Vy are written on the plasma panel, see the documentation previously linked for how to read the PDP60R1 label.

If the Vsc and -Vy measure correctly with the buffers in place and all connections correct, you should be able to see a little glow from the screen.

[clubberlange]

Re: LG Plasma 60pk950-UA no picture or sound

OK, something strange going on. I unplugged the white wire going between the buffers. Uhooked p104 and tested voltage and it was good. Hooked p104 and unhooked p105, tested and voltage was good. Hooked everything back up and voltage was good? Also I guess I need to know what voltage you want checked. Also what should I see for voltage on Vsc and -Vy?

[tom66]

Re: LG Plasma 60pk950-UA no picture or sound

Is that the small white wire connection between them? If so, yes. Isolate that at the same time.