Red spot spreading out on 3 lcd projection - diyAudio
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Old 5th November 2013, 11:33 AM   #1
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Join Date: Jul 2003
Location: Dona paula, Goa
Default Red spot spreading out on 3 lcd projection

This problem must have started when the water condensed in the 3 LCD projector due to air conditioner being switched off when the projector was off all the time.

The projector now shows a red (big) spot which goes on spreading to a circle. I have opened it but there are no optic issues. Also at power on, the condition is better.

I suspect two things,
1) One of the HTPS panel has absorbed water. Don't have any idea this can happen.
2) There are two chips with ball grid- I suspect the water below the chips is responsible.

Can I clean the pcb with deionised water and then dry it in an oven.

Anyone can guess what could be the problem...

Gajanan Phadte
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Old 5th November 2013, 03:07 PM   #2
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Neither is responsible. I would go for the blue LCD burning due to excessive heat from an old lamp or dirty filters/fans.
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