DMD chip for Optoma HD80/HD81 or Benq W5000 / W20000 projector - AVS Forum
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post #1 of 12 Old 06-15-2012, 03:31 AM - Thread Starter
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Hello,

I want to buy a DMD chip present in Optoma HD80 Hd81 or Benq W5000/W20000 DLP projector. The type is 1910-911a or 1910-9028.

Payment through paypal

Thanks.
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post #2 of 12 Old 06-26-2012, 02:30 PM - Thread Starter
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post #3 of 12 Old 05-08-2014, 06:08 AM
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I have exactly the same request.

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post #4 of 12 Old 05-08-2014, 08:51 AM - Thread Starter
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Hello,

What problem do you have on your DMD chip and in what projector make/model is it fitted?
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post #5 of 12 Old 05-08-2014, 09:56 AM
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My BENQ w5000 has half the screen working and half the screen showing a white screen with black horizontal stripes/points which vary from 20 pixels till 1 pixel wide and one pixel in height.

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post #6 of 12 Old 05-08-2014, 11:57 AM - Thread Starter
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I suspected just that:) There are many posts on forums that point this to DMD chip, but it's all wrong. I even saw repair kits on eBay. According to them, DMD doesn't make contact with the board but in reality the fault is somewhere else. I revived about 10 w5000/20000 with this problem.

In this case your DMD chip is all right. The common problem on this projector is a fault on DLP formatter board. The image is processed by 2 identical chips (1 for half screen). The cause is a fault on a poorly designed power supply. If you have luck you need only to change a transistor, if not a RLDRAM chip must be replaced.

Mircea
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post #7 of 12 Old 05-09-2014, 02:56 AM
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Ooh thank you for your help! What would be the best steps to fixing it then?

 

I live in the Netherlands

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post #8 of 12 Old 06-05-2014, 02:39 PM
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Quote:
Originally Posted by cream View Post

I suspected just that:) There are many posts on forums that point this to DMD chip, but it's all wrong. I even saw repair kits on eBay. According to them, DMD doesn't make contact with the board but in reality the fault is somewhere else. I revived about 10 w5000/20000 with this problem.

In this case your DMD chip is all right. The common problem on this projector is a fault on DLP formatter board. The image is processed by 2 identical chips (1 for half screen). The cause is a fault on a poorly designed power supply. If you have luck you need only to change a transistor, if not a RLDRAM chip must be replaced.

Mircea

I too have the same problem as David, only mine has progressed to half the screen being completely black. Does this still sound like an easy transistor fix, or has my DMD chip indeed gone bad?
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post #9 of 12 Old 06-05-2014, 02:51 PM - Thread Starter
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Hello,

DMD chip is out of the question. Usually the DMD fails by suffering pixel failure.

In your case, the worst that could happen is for the RLDRAM chip to fail (a voltage supply is feed through the transistor that fails first). A replacement memory is about 5-8usd but the installation is difficult because the package is BGA and you need special rework tools in order to do that.

Mircea
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post #10 of 12 Old 11-10-2014, 01:15 PM
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Mircea,


Are you able to provide more information on the transistor repair? Would welcome details of replaced part, tools required and some pictures would be ideal.


Thanks for your help,
Nick
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post #11 of 12 Old 11-29-2014, 01:06 PM
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Quote:
Originally Posted by cream View Post
Hello,

DMD chip is out of the question. Usually the DMD fails by suffering pixel failure.

In your case, the worst that could happen is for the RLDRAM chip to fail (a voltage supply is feed through the transistor that fails first). A replacement memory is about 5-8usd but the installation is difficult because the package is BGA and you need special rework tools in order to do that.

Mircea
Mircea,
Please PM me, I have a Benq W20000 that i'm looking at option for repair.
Thanks,
Troy
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post #12 of 12 Old 11-29-2014, 03:55 PM - Thread Starter
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