Samsung LA32R81B Washout pictures

[mikecarel]

Hi,

I've got problem with my samsung LCD with model number LA32R81B, Its now having a washout pictures when powered on and normalized after 2 minutes. Tried to check everything on its power supply (even change all capacitors)and found no faults on it. Please refer to link below for the clearer view of the problem.

http://i1210.photobucket.com/albums/...627_205034.jpg

Hope someone clearly guide me to identify the root cause of this problem.

Tnx,

Mike

[tom66]

Re: Samsung LA32R81B Washout pictures

This is possibly an incorrect setting on the main board. Have you tried a factory reset? If not, it may be AS15G gamma chip failure.

[mikecarel]

Re: Samsung LA32R81B Washout pictures

Hi Tom,

I've tried reseting it to factory settings via Service Mode, but still the problem persists. It seems that when the TV get's hotter the pictures went back to normal, but when you powered off the TV for 30mins the problem goes back again.

Tnx,

Mike

[tom66]

Re: Samsung LA32R81B Washout pictures

That does sound like AS15G chip. Please post a picture of the T-con.

[mikecarel]

Re: Samsung LA32R81B Washout pictures

Hi tom,

You are right that the problem was in the t-con, using a x10 magnification lens I found a cold solder around the as15g chip. This was the cause of washout picture at cold start.

Thank you for pointing out where to start troubleshoting this problem. Its now ok after resoldering the cold areas.

Tnx,

Mike

[tom66]

Re: Samsung LA32R81B Washout pictures

Usually it's not just cold solder - the actual chip fails. If the problem comes back, you will need to replace that chip. It's available for around $5.

[GadgetmaNZ]

Re: Samsung LA32R81B Washout pictures

Usually it's not just cold solder - the actual chip fails. If the problem comes back, you will need to replace that chip. It's available for around $5.

I diagnosed it by using cold spray.
What I might try is to make a small heat sink to make it run cooler. At least for testing purposes until I get a new chip.