panasonic viera red half screen

[tom66]

Re: panasonic viera red half screen

Test patterns are generated on these sets by BOTH the A and D board. Each has different test patterns. The white AGING test, which is slightly tinted, is generated by the A board, as are a few others. The gradient, colour bar, solid colour, 10% fill/50% fill patterns and the scrolling bar are generated by the D board.

This is different to most TVs. I'm glad Panasonic did it this way as it makes diagnosing the board easy.

Refer to this document for more information.


If that board is from the PZ85, it should fix it. If it's a PZ80, no guarantees. Remember to match the part suffix to your current D board as well. Part suffix printed near part number e.g. TNPA9999 AW. You must match both TNPA9999 and AW.

[wreksta]

Re: panasonic viera red half screen

im lost now so with test patterns on I thought this was generated from main av board im wrong arnt I

so a 22 quid board in there and she will live you rekon this is the board your referring to isn't it
http://www.ebay.co.uk/itm/1811548629...84.m1423.l2649

[wreksta]

Re: panasonic viera red half screen

im confused tom so its not my main hdmi scart etc input board just the ldvs /tcon board underneath

[tom66]

Re: panasonic viera red half screen

The D board. I think that's what you mean by LVDS. It's marked "D". Refer to service manual for diagram of boards.

[wreksta]

Re: panasonic viera red half screen

which one of mine is faulty ldvs under main av or the av board

[tom66]

Re: panasonic viera red half screen

Panasonic have always referred to the D board as the D board, as far as I'm aware.

[wreksta]

Re: panasonic viera red half screen

tom service manual referring to d board as ldvs

[wreksta]

Re: panasonic viera red half screen

think im going to examine d board before buying one nothing to look for or heat up to isolate the affected part

[tom66]

Re: panasonic viera red half screen

85 is different panel, better black level and motion performance. Maybe will work but cannot be certain. Seem to remember there being a surplus of '80 boards as they rarely fail. Generally quite reliable sets too.

[wreksta]

Re: panasonic viera red half screen

will this one work its for the 80 not the 85 but cant seem to find a 85 anywhere in uk

[wreksta]

Re: panasonic viera red half screen

nothing to fix then no reflow of solder points diode checks mosfets etc

[tom66]

Re: panasonic viera red half screen

The D board generates most of the patterns internally, so if the noise affected ALL the patterns, then the D board is definitely faulty.

[wreksta]

Re: panasonic viera red half screen

any info on the d board checks etc tests could the ldvs stil cause this or defo bad d board

[tom66]

Re: panasonic viera red half screen

Check them by all means, but don't adjust them unless you have to.
High Vsus typically causes overblown image (too white) or blue sparkles. Low Vsus causes pink discolouring. On these panels at least.

[wreksta]

Re: panasonic viera red half screen

If you got those lines with the D board tests, the D board is bad.

The Vs and Vda(=Va) would not cause this. Whatever you do, do NOT touch Vda or you can kill the panel! The -Vad, Vscn and Ve cannot cause this either. Neither can buffer boards SU/SD or sustain/scan board SC or sustain SS. It's between A & D and given you isolated A, by doing testpatterns (and all showed noise right?) the D is bad.

and I wont touch them just with that electrical surge lazer noise from ymain
though maybe vs va to high


I seen that behaviour before on old goodmans gtv when you messed with vs the panel would flick and click then switch off

[wreksta]

Re: panasonic viera red half screen

so replace dboard or fix is there anything obvious to test mate is the d board the main av

cant I heat parts up to see if affected area can be mended

[tom66]

Re: panasonic viera red half screen

If you got those lines with the D board tests, the D board is bad.

The Vs and Vda(=Va) would not cause this. Whatever you do, do NOT touch Vda or you can kill the panel! The -Vad, Vscn and Ve cannot cause this either. Neither can buffer boards SU/SD or sustain/scan board SC or sustain SS. It's between A & D and given you isolated A, by doing testpatterns (and all showed noise right?) the D is bad.

[wreksta]

Re: panasonic viera red half screen

I got a sneaky feeling the vs va and other voltages are not correct haven't tested these yet that ymain noise is quite alrarming but ill bite the bullet if you say I should

[wreksta]

Re: panasonic viera red half screen

hi tom just did above test problem is still there
these are not lines like pixel lines they are flashes of different colours etc

do you think vid board is naffed can you test this at all

[tom66]

Re: panasonic viera red half screen

You can:
Hold VOL- on set and press 0 three times on remote. Release VOL-.
Wait some seconds... screen should flicker and service menu should pop up.
Press RED twice to get initial pattern then RED for each subsequent pattern. Note some patterns are generated by A board, but most by D board.