Fault on panasonic veira th-58pz800b

[1967tux]

Hi all i am new to the forum and was hoping to find some help repairing a Panasonic th-58pz800b. The tv does not have a red flashing light problem and starts up ok. my problem is the screen only shows about 1/3 of the full screen on the right hand side and the part that does show is very distorted and has a red tinge to it , the remote seems to work and scroll through the menu ok (from what i can make out). On the test screen It shows some of the different test patterns but only on the same 1/3rd of the screen and again very distorted and with a red tinge. I have also disconnected the main board and i do not get the white screen. i am not sure which board is at fault when i got the tv it had a red flashing light issue and i traced this out to a blown chip on the d board, i replaced the d board and that is where i am at the moment, any help would be greatly appreciated. is the d board still at fault as it is a second hand one from ebay? or should i be looking for another issue? i have included some pictures of the screen.

[tom66]

Re: Fault on panasonic veira th-58pz800b

Could you supply a picture of the fault?

[1967tux]

Re: Fault on panasonic veira th-58pz800b

Hi Tom have posted some pics of the screen.

[tom66]

Re: Fault on panasonic veira th-58pz800b

I would suggest you re-seat the LVDS cable. I had a vaguely similar fault:
https://www.youtube.com/watch?v=4gL_...c&noredirect=1

caused by a loose LVDS cable

[dj_ricoh]

Re: Fault on panasonic veira th-58pz800b

I would suggest you re-seat the LVDS cable. I had a vaguely similar fault:
https://www.youtube.com/watch?v=4gL_...c&noredirect=1

caused by a loose LVDS cable

that`s your channel?

saw your videos way way back !

[tom66]

Re: Fault on panasonic veira th-58pz800b

Yes that's my channel...

[dj_ricoh]

Re: Fault on panasonic veira th-58pz800b

Yes that's my channel...

Cool!

[1967tux]

Re: Fault on panasonic veira th-58pz800b

hi tom thanks for your suggestion i already watched your video very good and informative. I have tried the lvds cable and it has no effect. i also watched the one on how to test rest of the tv with the main board disconnected i am not able to get the white screen. I dont think the screen is bad as the side that is not working seems to be primed, i am wondering if the fault still lies with the d board or some where else.

[1967tux]

Re: Fault on panasonic veira th-58pz800b

just a quick up date i have now fitted a replacement ss board as one of the chips was also blown on that. the tv now has a good picture but only on 1/3rd of the screen. am i right in thinking that this is the c2 and c3 buffer boards ? is there any way i can test to confirm this or is there something else that can be causing this. any help or advice would be greatly appreciated.

[1967tux]

Re: Fault on panasonic veira th-58pz800b

have attached photos of how the screen looks now

[freakaftr8]

Re: Fault on panasonic veira th-58pz800b

I'm thinking something is wrong with the control board. Or logic board as its also called.

[freakaftr8]

Re: Fault on panasonic veira th-58pz800b

Usually whatever xontrolls the C buffers. Try reseating cables first. Especially if someone else has been into it before. They sometimes are a trick to reseat them and someone could have not seated them correctly

[1967tux]

Re: Fault on panasonic veira th-58pz800b

have tried reseating cables no change, tried replacing c2 and c3 no change the original logic board had a fault and i replaced this how ever the board i replaced it with was the same number tnpa4439 but it was from a 42" tv could this be the problem? the board looks identical but im wondering if this could be a software type issue ??

[nomoresonys]

Re: Fault on panasonic veira th-58pz800b

wonder if a firmware update would put it right?

[Shinju]

Re: Fault on panasonic veira th-58pz800b

have tried reseating cables no change, tried replacing c2 and c3 no change the original logic board had a fault and i replaced this how ever the board i replaced it with was the same number tnpa4439 but it was from a 42" tv could this be the problem? the board looks identical but im wondering if this could be a software type issue ??

Does this new logic board have a suffix at the end of the TNPA4439? The 58PZ800B Logic board does not. These suffix are very important to follow, if you got a logic board out of a 42 chances are its not compatible.

With my experience with Panasonic plasma's it is very important to replace parts with the exact same number and suffix.

[1967tux]

Re: Fault on panasonic veira th-58pz800b

Yes the original had no suffix the new has bf so would you say this is the probable cause? and would it be possible to update the firmware to rectify this or just get a board with no suffix?

[Shinju]

Re: Fault on panasonic veira th-58pz800b

Yes the original had no suffix the new has bf so would you say this is the probable cause? and would it be possible to update the firmware to rectify this or just get a board with no suffix?

Hard to say to be honest, is there a FW update available? Also when you use a smaller panel spec control board the screen is usually whole but fitted to the size it was intended for for example it would be 42" on your 58" screen.

To me you have more wrong if you are only getting 1/3 of the screen before and after then you have issues elsewhere too.

when you changed your C buffers did you try them with the old damaged control board or your new one?

[tw2005]

Re: Fault on panasonic veira th-58pz800b

have tried reseating cables no change, tried replacing c2 and c3 no change the original logic board had a fault and i replaced this how ever the board i replaced it with was the same number tnpa4439 but it was from a 42" tv could this be the problem? the board looks identical but im wondering if this could be a software type issue ??

I think you may have to try and source the correct D board. The 42 only has 2 c buffers, yours has 3 so it may be an addressing issue.



Tom may have a better idea

[Shinju]

Re: Fault on panasonic veira th-58pz800b

I think you may have to try and source the correct D board. The 42 only has 2 c buffers, yours has 3 so it may be an addressing issue.



Tom may have a better idea

This as well.

[tw2005]

Re: Fault on panasonic veira th-58pz800b

longshot but only other thing to suggest is swap ic9303 and ic9001 across from the old board but either of those eeprom / flash IC is corrupt then you may transfer whatever problem the original had.

ic9303 is 48 pins, 9001 is 8