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White dots on screen

post #1 of 13
Thread Starter 
We have a Benq MP777 projector installed at our church and it has developed a ton of white dots at the top of the screen. We just replaced the bulb this morning but the dots remained. Anyone know what is causing this and if it is repairable or do we need to purchase a new projector?

post #2 of 13
Looks like a failure of the DLP chip. A ton of stuck mirrors.

Depending on the price/quality of the original projector, it likely is a 'replacement' scenario. I would expect $500 or so possibly more for repair.

A lamp will NEVER cause that type of issue. Lamps make light for the entire projector, not small sections, so replacing a lamp will never impact the projector in such a localized manner like that.

There are several projectors under $1,000 which are comparable replacement alternatives:
http://www.projectorcentral.com/projectors.cfm?g=1&hide=0&st=1&mfg=&p=700-1000&w=&r=&br=4000&br=40000&ll=&ltg=&t=&db=&dt=&c=&ar=&dvi=&wr=&pjl=&pjw=&pjh=&td=&i=d&is=&sort=pop
post #3 of 13
Thread Starter 
Thx AV. That's what I was finding online too. Most were pointing to a failing chip. We paid $1300 for it in 2014. It gets used for 3 hrs per week (1hr Sunday morning, Sunday Night and Wednesday Night). Sad that the bulb has less than 750 hrs on it and it's failing. Definitely seems these are becoming disposable units like most so many other electronic devices being made today. Appreciate the help.
post #4 of 13
Quote:
Originally Posted by youthman View Post

Thx AV. That's what I was finding online too. Most were pointing to a failing chip. We paid $1300 for it in 2014. It gets used for 3 hrs per week (1hr Sunday morning, Sunday Night and Wednesday Night). Sad that the bulb has less than 750 hrs on it and it's failing. Definitely seems these are becoming disposable units like most so many other electronic devices being made today. Appreciate the help.


If it was purchased in 2014 wouldn't it still be under warranty?

post #5 of 13
Thread Starter 
Sorry that was a typo. We bought it in 2010
post #6 of 13
Quote:
Originally Posted by youthman View Post

Sorry that was a typo. We bought it in 2010


ahh...I see...I really did scratch my head the first time I read your original post...lol.

post #7 of 13
Thread Starter 
Lol was just typing and not thinking. It's way past warranty
post #8 of 13
Looks like a chip failure as mentioned before. It will only get worse. I am a fan of LCD technology however In all fairness there were a several batches of defective DLP chips that made their way to market a while ago and your model projector could have one. Samsung had a huge problem with this while back . The chances of DLP's chips failing at such a low level of use is NOT typical. I would check to see if there is any kind of extended warranty on your model. Sometimes companies do this as part of consumer action settlements. Bohanna
post #9 of 13
Thread Starter 
Thanks, I'll give Benq a call on Monday. Never hurts to ask.
post #10 of 13
Second time this month. Why do people think replacing the bulb will fix white dots on the screen!!!
post #11 of 13
Thread Starter 
I didn't think that, our music pastor did. He wanted to try what he thought was the least expensive option.
post #12 of 13

Had the same issue on my Samsung 67" LED DLP (HL67A750A1FXZC).  SoI had to buy a new DLP chip (4719-001997) for just under $200 and replace it myself.  Worked like a charm.

 

Samsung refused to acknowledge that there was an issue with my model.  So they just lost a loyal customer (4 tvs, washer, dryer) for a $180 part that is failing at a high rate in market.

post #13 of 13
Quote:
Originally Posted by Jaxhog View Post

Had the same issue on my Samsung 67" LED DLP (HL67A750A1FXZC).  SoI had to buy a new DLP chip (4719-001997) for just under $200 and replace it myself.  Worked like a charm.

Samsung refused to acknowledge that there was an issue with my model.  So they just lost a loyal customer (4 tvs, washer, dryer) for a $180 part that is failing at a high rate in market.

I just did the same dmd replacement back last fall...worked like a charm.

To op:
Here's a little info on changing one in a projector. It's an NEC pj so yours will be different but you can kinda see what's involved if you can find the correct dmd and decide to give it a go. http://www.perfectbuys.net/nec-np210-np215-white-dots-on-screen-fix/

The dmd is actually a fairly small device/chip that drops into a pc board...kinda like a cpu chip in a computer. Here's a more detailed install on a rear projection dlp tv...again very similar premise as a front projection unit : http://www.fixyourdlp.com/2012/08/22/eliminate-white-dots-on-your-mitsubishi-wd-65733-with-a-new-4719-001997-dlp-chip/
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