Friends Sharp LC-32SH2OU Fades to White

[Phydoux]

I was at a friends house yesterday and he had this 32" Flat screen sitting on the floor in his spare bedroom. I asked him what was wrong with it and he said when he first turns it on the picture is beautiful but then it fades to white after about a minute of it being on. I'm assuming it might be a capacitor going bad or maybe just a loose video cable. Something is happening when it warms up.

What could it possibly be? Am I correct with a capacitor going bad?

[aaronwt6]

Re: Friends Sharp LC-32SH2OU Fades to White

Most likely it's going to be the t-con board. That would certainly be my first guess. Post some pictures of the TV with the back off so we can see what all the boards look like.

[budm]

Re: Friends Sharp LC-32SH2OU Fades to White

Need Screen shot of what is showing on the screen too.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

I will go pick it up tomorrow after work. He's agreed to let me have it.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

OK, Here's what I got.

Whole back:

P1020080-sm by Alan Mars, on Flickr

Left Side Board:

P1020082-sm by Alan Mars, on Flickr

Right Side Board:

P1020077-sm by Alan Mars, on Flickr

Found one resistor that didn't Ohm out:

P1020077-No Ohms by Alan Mars, on Flickr

Found another Resistor that had no Ohms...:

P1020077-No Ohms 2 by Alan Mars, on Flickr

So, I'm assuming that is what's wrong with this. I'm not getting any Ohms through these resistors.

[budm]

Re: Friends Sharp LC-32SH2OU Fades to White

That is 100K (Brown Black Yellow) resistor, what scale on your meter you set it to?
T eh T-CON is hidden under all those sheet metal.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

I'm using a Fluke 114. I had it set to audible. When I set it to regular Ohms I get 82.4 on the first one and 99.9 on the second one.

I guess I'll need to put the TV on the floor to get to the T-Con. That metal is connected to the base stand.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

Here's a photo of the T-Con board.


P1020085sm by Alan Mars, on Flickr

And the underside...


P1020086-sm by Alan Mars, on Flickr

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

An update on the symptom also since I have it in my possession. I plugged the DVD player into it and started watching a DVD. After about 3 minutes the fading was actually lines disappearing until there were only a few lines of picture left. So I'm assuming it's the video board.

[budm]

Re: Friends Sharp LC-32SH2OU Fades to White

When you check the resistance of the resistor, always put it on the Ohm mode.
Can you show us the screen shot so we can see what the pictures look like on the screen?

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

I will do that when I get home from work. But basically it looks like the screen disappears line by line. First really fast then it slows down a little bit until they are all gone. The lines are horizontal (left to right).

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

OK, well... I put it back together and have been watching Mad Max Fury Road for about 30 minutes. Must have had a bad connection on the T-Con board...

Friend said I can keep the TV because he replaced it since he thought it was messed up. Happy Me... Merry Christmas to me!

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

Hmmm. I looked at it again and the screen was totally black while the movie was playing. About an hour and a half into it. Totally missed how it went out. Probably the same way it did last night. I guess I'll let it cool down and try again tomorrow after work.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

Tried turning the TV on this morning and all I get is a blank screen. The power light comes on when I turn the TV on, the screen lights up but stays black. There is no flashing code or anything to indicate what the problem might be. The power light just stays on green steady. When the TV is powered off the power LED turns orange as it has since I've been troubleshooting it. I don't even see the "PLEASE WAIT" message anymore like I saw the first couple times I turned it on.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

A quick glance over the boards this morning didn't reveal any popped caps or anything else out of the ordinary. I guess my next question would be should I buy a new T-Con board or could it be the video board?

I doubt it's the power supply. When I plug the TV in the power light is orange and when I turn it on the light turns green. I'm guessing that the power is correct. I'm just not getting a picture.

The screen lights up but it's black. Nothing else goes on with the screen. I'm thinking the lamps are OK too in this regard.

What's my next step?

[budm]

Re: Friends Sharp LC-32SH2OU Fades to White

You will need to find out if the T-CON is getting 5 or 12Vdc to run or not.

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

Can you tell me where to put the Meter to find that info?

[budm]

Re: Friends Sharp LC-32SH2OU Fades to White

Service manual:

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

Thanks!

[Phydoux]

Re: Friends Sharp LC-32SH2OU Fades to White

I put the new (used) Scaler board in yesterday and everything seems to be OK. I haven't really tested the TV yet with a movie. Maybe I'll get around to that today or tomorrow. Seeing the "PLEASE WAIT" message was a huge relief!