panasonic viera 42" rolling lines down screen

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

ok so is it just worth changing the A board for another one, rather than trying to fix it?
when you say heat, you mean like a heat gun on the undeside where its soldered?

and sorry but A board is the main one on the right hand side bottom, with the hdmi and other sockets on it?,

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

where eould be a good place to get a replacement board,
someone mentioned johns parts or something like that?

[tw2005]

Re: panasonic viera 42" rolling lines down screen

I Can't really say but first thing would be to identify the correct board and revision, then google away

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

i do that by the codes on the board itself i presume ?

[tw2005]

Re: panasonic viera 42" rolling lines down screen

i do that by the codes on the board itself i presume ?

varies from region to region but either it will be the board number TNPHxxxx Rev xx as per a legend on the board or it may be stamped or white sticker could start with TXN/xxxxxxxx

Looks like Shopjimmy in the US has some.

http://www.shopjimmy.com/panasonic/tx-p42s20b


TNPH0845LB

TXN/A1LHUB

Certainly weird how this has a separate tuner board.

[tom66]

Re: panasonic viera 42" rolling lines down screen

Separate tuner is probably for Freeview HD, which is OTA HD tuner. Pretty nice feature to have, probably a bit of a last minute thought.

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

When I post depends entirely on when I have the time...... Tw will probably chip in later with additional info... I reckon this is an A board fault, you should access the service menu and use the test patterns feature.

Not sure what it is for this 2010 model but 2008 is this:

Hold VOL- on TV and press 0 on remote three times.
Wait for menu to appear (takes a few seconds)
Press "red" on remote a few times to select different patterns, note which, if any, are affected.

Ok did this and every step/ colour/ pattern are affected by the rolling lines Dow the screen, they do not go away at all!!
Does this help any?

[tom66]

Re: panasonic viera 42" rolling lines down screen

Well, it doesn't eliminate anything unfortunately, it could be the main board or something else, going by the symptoms alone it looks a lot like a main board fault, difficult to determine exactly where.

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

So it's probably best just to change it completely?

[Neelix]

Re: panasonic viera 42" rolling lines down screen

Could you check the monitor out picture? If the lines appear in the monitor out picture also, then it confirms the A board is faulty. Would you be able to get the correct service manual and do you have equipment to replace BGAs or know somebody that does? If not, then getting another A board would probably be your best choice

[tom66]

Re: panasonic viera 42" rolling lines down screen

Most TVs supporting "monitor out" (unless they directly support DTV or HDMI out) aren't reprocessing the signal, they're just re-routing the signal internally, so it's hard to say if that would confirm any particular issue.

[Bikemech]

Re: panasonic viera 42" rolling lines down screen

Sorry no I don't think it has monitor out, and I have no way of doing ball grid array re work or replacement, (googled BGA lol), is it possible it is just one bad IC on the A board causing the problems? A mean is there one main one or a few?