LG Plasma TV 50PA6500 vertical lines

[Jever2000]

Hello Guys,
i have a TV that has max 40h of usage (Office Monitor).
The next day, it has well defined vertical lines.
I doubt, it's the logic board (or T-con).
Can anybody confirm this ?

Sound comes nicely, and channels are switchable, only the lines remain.
Even entering the menu doesn't change the picture.

Please find attached some pictures.

Any help is highly appreciated.

Thanks, Jan

PS: In case... can i use a Rev. 1.1 board instead of the mounted Rev. 1.0 ? (same LG part no. for both)

[dcapper]

Re: LG Plasma TV 50PA6500 vertical lines

Can you take the back off and take some pictures of the boards for us?

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Thanks for the quick reply!
Yes, i can do so tomorrow.

However, i think it's such a distinct failure,
someone might know what's the cause.

I'll post pics tomorrow.

Thanks, Jan

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Ok, with a little delay, here's the picture.
IThe logoc board is the small one in the middle.

For LG spare parts, what is the relevant number, EBR or EAX ?

Thanks, Jan

[Malachi]

Re: LG Plasma TV 50PA6500 vertical lines

I have a t-con board for a 50pn6550. And the main board.

[ReeceyBurger123]

Re: LG Plasma TV 50PA6500 vertical lines

Look up on how to run the test patterns on Lg plasmas. I would say mobo at fault here.

[Malachi]

Re: LG Plasma TV 50PA6500 vertical lines

I made a mistake. The tcon and main board I have are from a 60pA6500ua

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Look up on how to run the test patterns on Lg plasmas. I would say mobo at fault here.

I disconnected the Mainboard and shortened the ext_auto_gen pins on the logic board.
The stripes remain, or better appear, when the pins are shortened.

So i suspect, the Mainboard is OK.

What about the Y-SUS ?

Regards, Jan

PS: i just measured some Voltages:

Y-SUS:
VY=190V
VSC=150,7 V

Power Supply:
VS=205,4 V
VA=55,6 V

VZB=149,9 V

[Alastair E]

Re: LG Plasma TV 50PA6500 vertical lines

Control-board fault.

[tw2005]

Re: LG Plasma TV 50PA6500 vertical lines

Control-board fault.

Ditto, I'd be thinking logic ctrl board especially if it remains with the mainboard isolated and the auto-gen enabled

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Ok, i think i'll replace it.
I have an EAX, an EBR and a revision on the board.

Do all three have to match ?

Thanks.

[tw2005]

Re: LG Plasma TV 50PA6500 vertical lines

most likely the EBR number, the EAX could be just the PCB number, the white sticker would be the one I'd go with.

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Ok, guys!
I finally ordered a new logic board for .... 6$ (18$ postage to Germany), and ......
IT WORKED

The pattern is still a bit visably when the screen is black, but i hope this will disappear over time.

THX to all supporting!
Jan

[mmartell]

Re: LG Plasma TV 50PA6500 vertical lines

Yes you may have some retention (hopefully not burn in!) Running it for a while should cure it.

[ReeceyBurger123]

Re: LG Plasma TV 50PA6500 vertical lines

Awesome, just a little IR wont take long to clear

[Jever2000]

Re: LG Plasma TV 50PA6500 vertical lines

Stripes are gone after letting my wife watch Downton Abbey