Benq MP 721 projector purple colour when it projects.

Black spots are more likely to indicate a partial failure of the DLP chip. The lamp cannot produce such a symptom sadly.

Repair will be quite expensive...

White spots on the screen are generally caused by a bad DMD chip.Multiple elements of the chip remain continuously on causing these spots.Solution is replacement of DMD chip.
Samr

Hi,

It's a DLP model with a colour wheel. It's an unusual problem.

I would start with a basic check and rule out the source material / cables / inputs by swapping them round. You might find that the problem is helped a bit by replacing the lamp but given the fact that this is an old model, with out of date specs and it's out of warranty then I'd be looking at replacing the projector before I spent any money on it.

Try calling Benq Support UK or International to see who their local repair agent is. Usually there is a charge to look at any out of warranty projector before they even begin to diagnose faults.

Good luck!

Please check the input selection some times it goes to y,pb,r mode.
Mahesh
M.R.Corporation
Mumbai -India

I I may have you try a simple test first, I have seen several no red problems fixed by changing or wiggling the vga lead to the computer. Also look for bent gold pins on the vga lead. I would do that first. Also go through the menu system and see if there is red in one of the icons on the screen to see if it is showing correct colour.
Good Luck!

I have found that vertical lines that suddenly appear from projectors are due to poorly connected cables. Sut off your projector and wait for the fan to go off. Then unplug the connectors from the computer to the projector and secure them again, making sure to go all the way. Hope this helps.

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OK , then this is positively a Mainboard problem.

Check if this unit is still under warranty as the BenQ MP Series came out with a standard 3 year warranty and in which case will cover the replacement of this part.

Hi there

This is unfortunatelly not possible at all on the PB Series Projectors. I'm a ASP Technician for BenQ Projectors and know then like the palm of my hand.

Hi guys

You will have to replace the LCD's .

Must warn you that it is very expensive