LG Plasma Model 60PK550-UD has sound but no picture

[jlbarsness]

I have a plasma LG model #60PK550-UD, I had a problem that I would have sound but no picture, it would take me between 2-5 times of powering on and off before I would get picture. Once I had picture it would stay on. Now I cannot get any picture at all, still have sound. Everything looks ok inside and I have replaced the ysus with no change.

Also before the whole no picture problem started I would get between 1-3 thin vertical lines at different places on the tv, they would come and go and move to different places.

Thanks

[sordids999]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Posting pictures of the back of your tv showing the boards with clear pictures may help you more with fixing your problem

[ljintexas]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Checking the label on the panel and checking Vs, VE, Vscan, and Vset voltages compared to the label will give a much better idea of where to start looking.

[jlbarsness]

Re: LG Plasma Model 60PK550-UD has sound but no picture

I can't take pictures of the lines since i can't get the picture to turn on. Here are photos of the entire back, and close ups of the boards. Hope that helps.

I only know basics about electronics so I don't know how to check the voltages, I do own an digital multimeter I just don't know how to use it.

[jlbarsness]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Anyone have any suggestions, I have already changed out one board that might not have even been bad, I hate to keep buying boards that I may not need.

[jlbarsness]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Well I have replaced the power supply board now also and I still cannot get a picture, only sound.

[Alastair E]

Re: LG Plasma Model 60PK550-UD has sound but no picture

You'll need to check the Vs, Va, VSC and other voltages when set is turned on....

There's various tutorials on the web on how to use a DVM, check those out then when confident--check the supplies in the set.
--Be aware though, Plasma sets have High Voltages combined with High Current--A Lethal Combination.....
--Word of advice when measuring voltages--Keep one hand in yer pocket.....

[PowerAmpFreak]

Re: LG Plasma Model 60PK550-UD has sound but no picture

I had one of those, bad logic board.

[Hamie]

Re: LG Plasma Model 60PK550-UD has sound but no picture

I had one of those, bad logic board.

I'll second that.

[jlbarsness]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Is the logic board the same as the control board?

[PowerAmpFreak]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Yes, the smallest board with the fastest brain

[jlbarsness]

Re: LG Plasma Model 60PK550-UD has sound but no picture

Well some good news, I replaced the control board and I have picture again so that issue is fixed. I still have the random green vertical lines, there is only one now it is on the left side of the screen near the middle.