samsung ln32a330j1d picture troubleshooting

[jcyow]

Trying to troubleshoot this tv. It's been working fine since last year when I had the no power/ replace the caps and everything's fine incident. However, the picture has started to go. It looks like a faded negative with odd color which is present using both component and coax inputs. No odd colored lines, no distinct solarization.
I've done both factory resets without resolution to the problem. But when I pull up the onscreen menu, the menu itself looks fine. Back of the input board does have some odd light tan color to it here and there but visually the boards look fine and there is no dust inside.
The picture doesn't look as bad as some of the the posts which required a tcon board replacement, but then again, I can't be sure what exactly happens when a tcon goes/is going.Thought?

[budm]

Re: samsung ln32a330j1d picture troubleshooting

Take the screen shot of the screen and the T-CON board, it sounds like Gamma problem.

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

..as requested:

[budm]

Re: samsung ln32a330j1d picture troubleshooting

Does the small square IC with lots of pins just below the right ribbon connector on the T-con board as AS15 printed on top?

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

yes. AS15 -G

[tom66]

Re: samsung ln32a330j1d picture troubleshooting

Can you post a closer pic of this IC? There are usually test points near it.

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

as req:

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

is the thought that the tcon is shot or just the ic? and which would be more intelligent to change?

[budm]

Re: samsung ln32a330j1d picture troubleshooting

I would say it is the AS15G IC Gamma voltage reference is bad, you can report the readings as TOM requested.

[tom66]

Re: samsung ln32a330j1d picture troubleshooting

You can try checking each point marked GM1, GM2, GM3 up to about GM20 (may be a few less) and report the voltage measured on each, which will definitively confirm if the gamma voltages are bad and if the chip or t-con needs replacement. You can replace either, but the chip is much cheaper, just a few dollars.

Note: GM# not just plain number. The chip acts as a voltage buffer. It has inputs 1-20 and outputs GM1-20, you should check GM1-20.

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

Apologies, TOM, I didn't realize you had asked for numbers. will get them up as soon as i figure out how to do it. Much thanks.

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

Think i might just get the tcon board since nobody in my area will solder a new ic. Thoughts on where? Or does everyone just roll the dice on ebay?

[tom66]

Re: samsung ln32a330j1d picture troubleshooting

First, I think it's a good idea to check those voltages: if they are bad, order a new board. And yes you will be rolling dice I'm afraid. I know there's someone on ebay doing repairs to similar boards - maybe they can help.

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

ordered the new board for my 32", installed and all is well. However, my samsung 46" is now starting to do about the same thing including the picture sometimes shrinks into the corner. if i turn it off and on it corrects itself but i think it's just trouble starting to happen! What's with this company? I think it's time to seriously take a look at sony!

[jcyow]

Re: samsung ln32a330j1d picture troubleshooting

And i would be remiss if i didn't say thanks to all for the valuable input!