Toshiba Regza 32AV635D LCD vertical lines

[Nightwalker]

Hello everyone and Happy New Year!

First problem of the set was the PSU went dead after a power surge. Toshiba service center says that new PSU will cost too much and the owner bring it to me(we have a common friend). I order from Ebay(trustworthy seller) a exactly the same replacement PSU board(SRV2169WW-I) and now tv is powering on as it should be. BUT..
Second problem is the image on LCD. The only thing that appears is a faint square with two vertical lines at the center.
So i wondering..
1)New psu has a problem(small chance for that)
2)TCON board went off as well
3)Tab bonds screwed from the transportation
4)Main board problem

From your experience, what is the most possible cause?

Thanks for your time

[jbfr_54]

Re: Toshiba Regza 32AV635D LCD vertical lines

I would try to clean and reset all flat ribbon cables from Tcon to panel and LVDS cable too (from Main board to Tcon). If not satisfying, small chance for the Tcon failing, more probably a panel tab bonds failure. Good luck

[jasonr2000]

Re: Toshiba Regza 32AV635D LCD vertical lines

its more than likely a bad t-con as it gets its power from the PSU and when the PSU went out it could have taken the t-con

let us know what happens after cleaning the flat flex cables and the LVDS cable

[Nightwalker]

Re: Toshiba Regza 32AV635D LCD vertical lines

Thank you both for replies

Forgot to mention that, was the first thing i tried, cleaning both of them with IPA, apply gentle pressure to LVDS and TCON connectors and ribbons, even on timing ic of TCON to see if something change, with negative results.

@jbfr_54 My concern is that when i open menu, nothing change on screen, on other lcds i had repair with tab bonding problems, when menu key is pressed, you see a change in colors or shapes.
I am not sure if same pattern exist on all tabs bonding problems ;/

@jasonr2000 I'll check tomorrow if 12v voltage goes to TCON is the same line of the 12v output of PSU. Must be the same, i guess, but resistance on both psu's at 12V line is the same.

Im planning to take some basic measurements on TCON board (filters/fuses, voltages etc) and if nothing is the answer, i have already inform the onwer, and agreed, to go for a TCON replacement. If even after that, problem is still there, next step is panel disassembly to check the tabs. I hope MAIN board to be ok..

Any other thoughts and ideas are welcomed
Also schematic attached

[Nightwalker]

Re: Toshiba Regza 32AV635D LCD vertical lines

Hello again

Just receive the Tcon replacement board, problem is exactly the same..
So not a Tcon problem..panel or mainbord left for checking..
Connecting an external RCA source, sound is ok, image appears 100% correct only 1cm on the top of lcd, rest of the area has problem..
As you can see from the pictures..any ideas to isolate the problem?