Toshiba 26HL37 : backlight on, sound on, no picture (white screen)

[vizi0n]

Hi!

I'm trying to fix a Toshiba LCD tv that has a randomly working display.

Most of the time when I turn it on it will flash once as it usually does, then instead of coming up to the current source display I get a white image that will after a few seconds/minutes display very lightly colored vertical thin stripes. Once in a while it does work normally when I power it on, but next time I turn it on again, the gamble starts over.

I have tried changing the t-con for a new one, same thing. I have actually tried 2 t-con (other than that first one that was in the tv when the problem appeared).

What are my options about this? Main board? Panel? Is there any way for me to test this kind of problem with a regular multimeter or does this matter gets more serious and requires an oscilloscope?

Here's a video of the startup sequence (volume was low, but you can hear it)

https://www.youtube.com/watch?v=sv3jfWBw_bA

Thanks for your help!
Frank

[budm]

Re: Toshiba 26HL37 : backlight on, sound on, no picture (white screen)

When the pictures disappear, do the backligts still stay on?

[vizi0n]

Re: Toshiba 26HL37 : backlight on, sound on, no picture (white screen)

The picture never shows when I power it on, only whiteish image. It will sometime power on and work normally, but thats like 1/50 chances. I've added a link to a video on Youtube showing the behavior in my first post.

The backlight/inverter are working fine

EDIT: I just recalled that once my son called me up a few weeks ago and said "dad, the tv's picture is frozen" and it was actually frozen on a frame and gradually becoming whitish. The sound kept running like usual.