benq mx711 overheating and colour distorts - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 11 Old 11-29-2019, 06:18 AM - Thread Starter
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benq mx711 overheating and colour distorts

We replaced the bulb on our benq mx711 projector about 6 months ago. Quite recently the unit has started overheating when trying to use it. After a few minutes the image also starts to suffer from discolouration and eventually it goes a green and purple colour. Any ideas how we can fix this please?
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post #2 of 11 Old 11-29-2019, 08:01 AM
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The color problems are the color wheel misbehaving. Did you replace the lamp with the manufactures original lamp? Cheap knockoff lamps have been known to run hot. Dust or a failing fan may also be the culprit. Don't blow compressed air of any kind into a projector as this will push dust into the optics. You need to disassemble and clean the dust out carefully.

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post #3 of 11 Old 11-30-2019, 02:40 AM - Thread Starter
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Originally Posted by rekbones View Post
The color problems are the color wheel misbehaving. Did you replace the lamp with the manufactures original lamp? Cheap knockoff lamps have been known to run hot. Dust or a failing fan may also be the culprit. Don't blow compressed air of any kind into a projector as this will push dust into the optics. You need to disassemble and clean the dust out carefully.
I'm pretty sure the bulb wasn't one that came from the manufacturer. I think they stopped making this type of projector back in 2013. I've taken the projector apart and cleaned it as much as possible but the problem persists. Do you think replacing the lamp again will solve the problem?
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post #4 of 11 Old 11-30-2019, 03:34 AM
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Quote:
Originally Posted by patrickyoung View Post
I'm pretty sure the bulb wasn't one that came from the manufacturer. I think they stopped making this type of projector back in 2013. I've taken the projector apart and cleaned it as much as possible but the problem persists. Do you think replacing the lamp again will solve the problem?
Original lamps are still being sold.
The part number is 5J.J3V05.001
https://www.projectorcentral.com/pdf..._spec_5859.pdf

The lamp is not that expensive, but instead of changing the lamp, why not change the projector?
Who knows what else might be wrong with the projector.
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post #5 of 11 Old 11-30-2019, 04:39 AM
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The discoloration is color wheel related.
Either the color wheel is shot and can't keep up, or the little IR rotation sensor needs cleaning.
These are the main culprits in most cases.

The IR sensor cleaning would be the first thing I would do.
Many times it just fixes the issue and saves you lots of time and money.

If you do clean it and the problem persists, then I would replace the color wheel.

An original bulb (not necessarily with the whole lamp assembly) is a must though.
Avoid knock offs they will give you problems.
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post #6 of 11 Old 11-30-2019, 05:57 AM - Thread Starter
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Originally Posted by evonimos View Post
The discoloration is color wheel related.
Either the color wheel is shot and can't keep up, or the little IR rotation sensor needs cleaning.
These are the main culprits in most cases.

The IR sensor cleaning would be the first thing I would do.
Many times it just fixes the issue and saves you lots of time and money.

If you do clean it and the problem persists, then I would replace the color wheel.

An original bulb (not necessarily with the whole lamp assembly) is a must though.
Avoid knock offs they will give you problems.

I'll give cleaning the IR sensor a shot as that seems the most immediate thing I can go. Can you give me an idea where the rotation sensor is located in the projector?
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post #7 of 11 Old 11-30-2019, 06:03 AM - Thread Starter
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Originally Posted by noob00224 View Post
Original lamps are still being sold.
The part number is 5J.J3V05.001
https://www.projectorcentral.com/pdf..._spec_5859.pdf

The lamp is not that expensive, but instead of changing the lamp, why not change the projector?
Who knows what else might be wrong with the projector.
It's been a really reliable projector since I've had it. So a bit reluctant to get rid of it. The lamps (on ebay) seem to range from £40 to £90. Am I right in thinking that I should avoid replacement lamps from China and Hong Kong? I think the one I bought six months ago cost around £40.00.
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post #8 of 11 Old 11-30-2019, 06:05 AM - Thread Starter
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Quote:
Originally Posted by evonimos View Post
The discoloration is color wheel related.
Either the color wheel is shot and can't keep up, or the little IR rotation sensor needs cleaning.
These are the main culprits in most cases.

The IR sensor cleaning would be the first thing I would do.
Many times it just fixes the issue and saves you lots of time and money.

If you do clean it and the problem persists, then I would replace the color wheel.

An original bulb (not necessarily with the whole lamp assembly) is a must though.
Avoid knock offs they will give you problems.
Also wanted to ask: where would you suggest I buy the bulb from as ebay seems to have a lot of knock offs advertised.
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post #9 of 11 Old 11-30-2019, 09:20 AM
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Originally Posted by patrickyoung View Post
Also wanted to ask: where would you suggest I buy the bulb from as ebay seems to have a lot of knock offs advertised.
Depends where you are located.
Look at the original bulb (inside the lamp assembly) and it will have written model number on its back.
Usually it will be an Osram PVIP or a Philips Top UHP.

Search it like that in the web and buy it from an online retailer with a legit address.
However, keep in mind that all these are made in China anyway, so in many cases you can find the same part from a Chinese seller on auction sites for less.
But it carries a risk being counterfeit.
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post #10 of 11 Old 11-30-2019, 09:22 AM
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Originally Posted by patrickyoung View Post
I'll give cleaning the IR sensor a shot as that seems the most immediate thing I can go. Can you give me an idea where the rotation sensor is located in the projector?
Right next to the color wheel.
On the side of the actual color wheel assembly.

Do an image search and you will get the idea.
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post #11 of 11 Old 12-01-2019, 02:33 AM - Thread Starter
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Originally Posted by evonimos View Post
Right next to the color wheel.
On the side of the actual color wheel assembly.

Do an image search and you will get the idea.

Brilliant. Thanks.
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