Toshiba 26hl47 White screen

[CraigR]

I have a 26HL47 Toshiba and it turns on and backlights come on but that's it no picture. I can press the menu or input buttons and just nothing on the screen but a white picture. I'm not even sure what to start checking so if someone could guide me I would greatly appreciate it.

[Shinju]

Re: Toshiba 26hl47 White screen

Might be the Siene board, I know that on of the trouble shooting sites I read when I was working on the 37HL was a white or black screen on boot up could be a siene board issue.

How many amber blinks before it comes on?

[CraigR]

Re: Toshiba 26hl47 White screen

No amber blinks. The green light comes on and stays on.

[tom66]

Re: Toshiba 26hl47 White screen

Try and get sound from a source without a picture, like a DVD player by fiddling with the input buttons.

[CraigR]

Re: Toshiba 26hl47 White screen

Yes! I was able to get sound and could adjust it up and down with the buttons but nothing on the screen.

[tom66]

Re: Toshiba 26hl47 White screen

Any pin marked 12VLCD on that sub power board? Top middle.

[CraigR]

Re: Toshiba 26hl47 White screen

No nothing I see marked that.

[tom66]

Re: Toshiba 26hl47 White screen

OK, what about the POWER_LCD pin, can you check that, it's on the flexi-ribbon-metal thing.

[CraigR]

Re: Toshiba 26hl47 White screen

Hard to tell what pin it's for but looks like 3.28V

[tom66]

Re: Toshiba 26hl47 White screen

When you turn the TV on and off, does this change?
If so, we will need to look at the T-con board.

[CraigR]

Re: Toshiba 26hl47 White screen

Just goes to 0V when off and 3.28V on.

[bammbammfran]

Re: Toshiba 26hl47 White screen

try disconnecting the one metal plug that has all the blue wires and the small one that is next to it with the 4 gray wires and see if the white screen is still about the same brightness.
If it is about the same, see if you have any voltage on the gray wire plug pins on the board side (Wires look glued so you probably want to check those with the plug removed)
then check the far right group on the blue wires (probably easier to check these with that plug plugged in

[CraigR]

Re: Toshiba 26hl47 White screen

Ok, just went out to check that and I accidentally left the TV on from the last thing I check and here now I have video. I'm guessing that something needed to warm up before the video came in???? Now what direction do I go?

[budm]

Re: Toshiba 26hl47 White screen

What do you get on pin 14 of connector CN90A of the B board (the brown board)? Also monitor this test point.

http://www.shopjimmy.com/media/catal.../0/2/022_1.JPG
Picture is provided by SHOPJIMMY.

[bammbammfran]

Re: Toshiba 26hl47 White screen

well that was an easy fix !!! LOL
One of your voltages may have to had to build up ?? Hard to say which
but since it lit and was white, it probably had to do with power that leads to the buried T-con board which can't be seen and I think that the wires that I mentioned go to that board ? AGAIN "I think"
In a lot of cases, white screens means that the pixels are not getting power to activate them.
so , for reference, see if you can see what the voltages are there and then you'll have to shut it down, let it cool and see what happens when you fire it back up.

[CraigR]

Re: Toshiba 26hl47 White screen

What do you get on pin 14 of connector CN90A of the B board (the brown board)? Also monitor this test point.

http://www.shopjimmy.com/media/catal.../0/2/022_1.JPG
Picture is provided by SHOPJIMMY.

I get 5.17 volts

[CraigR]

Re: Toshiba 26hl47 White screen

I will let it sit unplugged an hour or so and check it again.

[CraigR]

Re: Toshiba 26hl47 White screen

Could a ribbon cable do this? I turned it back on and it seemed the picture was frozen compared to the sound and I did a little twist on the frame and the video started to work then let of and froze again.

[bammbammfran]

Re: Toshiba 26hl47 White screen

did you try a different input ?
Try to check that 5 volts when the picture freezes or doesn't come on
also loosen up as much of the rear assembly that holds the boards, to maybe, see if it is at the lcd panel side or in the boards.

[CraigR]

Re: Toshiba 26hl47 White screen

I will try that tomorrow and post back.