LG 60PK550 Plasma TV - Bad Picture

[g-man70]

Looking for advise on my 2.5 year old LG Plasma TV (60PK550). Not sure how to best describe the picture issue so I've attached an image. If I turn it off and then back on, the issue remains. However, if I unplug the unit for awhile, plug it back in and turn it on, the picture is normal but only for a few minutes. This issue happens on all inputs. Any ideas as to what component could be the culprit? Prior to this, we would periodically see a white vertical line (about an inch wide) on the right side of the screen.

Thanks,
G

[Cnypitbulls]

Re: LG 60PK550 Plasma TV - Bad Picture

Am no expert but it could be the y sus board

[capkid]

Re: LG 60PK550 Plasma TV - Bad Picture

That doesn't appear to be a Y-Sus issue to me. I'd lean more towards the control board. The vertical bands appear to be evenly sized, which is often a sign of a bad control board.

[tom66]

Re: LG 60PK550 Plasma TV - Bad Picture

I'd agree. You can try to eliminate the main board by using the EXT AUTO GEN feature. Simply short the two points marked EXT AUTO GEN, unplug main board LVDS and turn the TV on.

[g-man70]

Re: LG 60PK550 Plasma TV - Bad Picture

Thanks for the feedback guys. I will perform the test in the next day or so. If the issue does not happen during the EXT AUTO GEN test, would that indicate that the control board is good?

[tom66]

Re: LG 60PK550 Plasma TV - Bad Picture

Generally, yes.

[g-man70]

Re: LG 60PK550 Plasma TV - Bad Picture

The control board was bad. I found a used one on eBay for $15. TV is working great now. Thanks to everyone who had input on this! It's very much appreciated!

[capkid]

Re: LG 60PK550 Plasma TV - Bad Picture

That was fast. I'm glad it worked out for you.

[tom66]

Re: LG 60PK550 Plasma TV - Bad Picture

Thanks for the repair feedback.

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

I would still need all other cables except the LVDS cable in order too do an auto gen test correct? One of the HDMI's on the main board burned a hole through the PCB, so I don't believe I should leave it connect. Weird thing however is that on this model you don't need the main board installed for screen to (Prime) then fully illuminate when plugged in?

[Hamie]

Re: LG 60PK550 Plasma TV - Bad Picture

Why not remove Ic701 and test the mainboard?
Might get lucky.

[freakaftr8]

Re: LG 60PK550 Plasma TV - Bad Picture

Agreed. Ic701 is most likely scrambling the HDMI codec in turn messing up the processor. Remove ic701. Bored should work without it

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

I removed ic and cut a line through the HDMI traces and made sure they were not making contact with one another, but the board started getting really hot when I plugged it in. I am currently waiting for a board in the mail.

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

Second pic. It won't let me upload more then one in manage attachments?

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

Sorry I meant I removed the Diode at D7002 as it was burned aswell. I am currently removing the IC you suggested and will let you know how it goes. Thanks for your advice it is much appreciated.

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

Same result a before, the board became very hot around the eprom and another heatsink on the board was also to hot.

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

Ok I found a donor tv it is an LG 60PX950. I removed the Z Sus, upper & lower Y Buffers, Y Sus, and the power board and put them in my LG 60PK550 that would turn on with no sound or picture and now it works perfect. The image was a little grainy but once I went through the picture wizard it looks impeccable.

[Logen1]

Re: LG 60PK550 Plasma TV - Bad Picture

Edited.