Hello everyone.

I'm currently building my first projector.
While arranging everything inside the box, I encountered a problem - the picture has a strange noise between colors.
Noise I didn't notice when the LCD screen was assembled.

The panel is after a relatively successful AG removal process with soak towel.

Parts:
HP 1502 - 15" LCD
Philips 400W MH bulb
15" Standard fresnel lenses

(The picture I took is one of XP's sample pictures)


The original:




Things I have tried but didn't help:

• Tightening the board's FFCs.
• Replacing to 3 different Video cards + reinstalling the drivers.
• Changing the color depth from 32Bit to 16Bit.

What else can I try ?
Thanks guys.

May be a grounding issue between the LCD panel and the controller. Usually there are thin copper strips on the LCD's PCB that tied in with the LCD frame or controller. Do you have pics of what was connected where? Test leads with alligator clips on both ends makes it easy to test.

Also be sure your cable connection from your controller to the LCD is firmly seated.

I do NOT advise connecting the ballast ground to the controller or LCD ground. I fried my controller that way.

To me, it looks like it is only displaying 256 colors. I may be wrong though, its been known to happen.

bevo77, thanks for the tips, I'll check that.

daveoxide, it seems to me too that this is a 256 colors display, but I don't have another color depth option (except 16\32Bit) to select.

It does really look like colour dithering for a low colour pallette.

I didn't have quite that problem, but I did need to enclose my control board in a grounded metal case in order to get a clean image from my LCD.

Seriously though that looks like iot's colour depth issues. Check with a different computer?

Haven't tried with different computer as this is my only (relatively) mobile computer.
I have checked the computer with another monitor, though. Works flawlessly.

Why could it be the computer ? If at all it's the video card fault, isn't it ?

Need to find some alligator clips for the grounding issue ..