I need the shematics to install A DMD chip in my Mitsubishi Model WD-C657

Bad DMD chip
call Mitsubishi, they will send one to a servicer at no cost, you will only pay for labor

After years of usage, the Mitsubishi WD-60735 starts to show some white dots, they begin to increase day by day all over the screen.
The problem is related to the DMD chip Part# 276P595010.
The part is about $200 you may find it used and cheaper on ebay.

Good luck
www.aaatvservice.com

The DLP chip is failing. There is no way to fix this except to replace the DMD (digital mirror device) chip. Contact Mitsubishi for repair centers.

Home IPS LaserExpress

Mitsubishi is replacing these DMD IC chips nationwide under an unannounced kind of recall for model #'s WD60C9, WD73733, WD57734, WDY657, WD73734, WD65735, WD60735, WD65C9, WD73840, WD65833, WD65733, WD73735, WD73833, WD57733, WD65734 and others. Call them @ 800-332-2119 and give them your model, serial # and date of purchase, tell them you have the white spots, they will set up a workorder with a local Mitsubishi servicer to come to your home and replace the DMD chip. Mitsubishi will supply the part (part # 276P595010) for free, but you must pay $200 in labor. BUT...if you ask for Shantell Hebert when you call Mitsubishi, and really push the issue, she will also pay half of the $200 labor fee, so you go from $400 to repair to only $100. Once that chip is replaced, the unit works great again!!

White dots on your RPTV television are the result of the DLP chip being worn out. You can replace it very easily by buying a new DLP chip for just under $190 and installing the new chip. There is a very good forum over at fixyourDLP that offers tutorials for replacing the DLP.
http://www.fixyourdlp.com/2012/10/11/banish-white-dots-from-the-samsung-hl56a650c1-with-a-new-4719-001997-dlp-chip/
or for Mitsubishi
http://www.fixyourdlp.com/2012/10/02/install-a-new-4719-001997-dlp-chip-and-banish-white-dots-on-the-mitsubishi-wd-82737/

This is something of an urban myth....The "DMD chip" is actually the LCD display IC for the set; yes I have seen some listed on EBAY---still a myth----they are replaced (when a light engine is rebuilt in a space age lab or environment) under exacting conditions----if positioned a micron off in any direction picture will be tilted in some way---this is also not like changing spark plugs in a car, if you have a optical engine issue like spots etc, either get a rebuilt engine from Mitsubishi or buy a new set.

They usually require some parts for old engine (mounting brackets etc) be installed on new or rebuilt engine.

I did see the "chip" for another model listed on ebay today.(100.00 PLUS)

I understand the engine is expensive, I replaced a lot of them when the sets were in warranty---more Mitsubishi than any other brand with Samsung a distant second.

I am sure Mitsubishi does not offer the part for sale--they want to sell a tested rebuilt engine only.

I wish you luck but have little hope you will find a "part" other than the whole engine.


SD TECH

This unit uses a DLP (digital light processor) chip and if this starts to fail then you will get spots appearing on the screen. The DLP chip will need to be replaced.

try to replaced the DMD chip.

I have the same tv with the same problem and have found it to be the dmd chip which controls the mirrors. Once the chip begins to go it just gets worse and eventually will have to be replaced. Unfortunately you can't just go out and buy one and replace it yourself. It is mounted on the light engine circuit board and I got an estimate on the light engine from an authorized service representative and the cost for the part alone is about $900.00. The white spots are when the mirrors get stuck in the on position and if they get stuck in the off position they display a black dot, which I also have some of them. In a month's time my tv has gone from no dots to over 100 now. I have been searching to see if there is anyone who repairs the light engines instead of buying a new one, as this would surely be cheaper and I found a company that does this, but they will not do business with consumers only repair services. They are Hong Video Technologies, so if anyone out there knows how to get these engines refurbished and what it would cost, we both would be very appreciative.
Thanks

If you get White or black dots all over the screen (DMD symptom)
If you get a pixilated picture (DMD Board)