Question about Sony Grand WEGA KF50WE610 50" Rear Projection HDTV-Ready Television

6 Answers

White spots on DLP TV

I have a Mitsubishi WD-C657 which is less than one year old. This TV has a "constellation" of six bright white dots, each about 1/16", and if you look very closely, there seems to be a faint "smear" from the corner of each dot. The dots are present whenever the TV is turned on, regardless of the source, or even with no input at all (blue screen). They are always in the same location, and they are not on the surface of the screen, but are dots of light coming from within the TV. They are visible (and stationary) right through any image on the TV. I have tried "re-setting" the TV, to no avail. Any assistance would be greatly appreciated, thanks.

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  • Cirrus9 Mar 21, 2008

    Jaime,

    Thanks for your quick response. I\'ll check the light tonight when I get home. Would dust or contamination on the light cause bright white spots(which is what I have), or dark spots?

    Thanks again,

    Jon

  • Cirrus9 Mar 22, 2008

    Took the back off the TV, cleaned the light and the mirror. No change. I guess what I\'m looking for here is someone who has actually encountered and fixed this problem before, and actually knows what it is from experience. Anyone out there?
    Thanks, Jon

  • Cirrus9 Mar 26, 2008

    BTW, although the TV is less than a year old and I am the first owner, I bought it from a wholesaler, not Costco, and I do not have a Costco receipt; therefore Mitsubishi will not honor the warranty.
    Anyone have any experience with this problem?
    Jon

  • Cirrus9 Apr 07, 2008

    Thanks for your input. Here\'s an interesting development - some of the dots have disappeared on their own (?). Four of the dots are gone, but nothing has changed now in the last week, so I\'m assuming that I am stuck with the remainder. All I have done is play DVDs via the HDMI input. Does this add any useful information? What would cause these dots of bright white light to appear and then disappear on their own? The video is not really "distorted" if I understand your meaning - just bright pinpoints of light. I think you are narrowing it down correctly to the optical engine (color wheel?) although I don\'t know a lot about what makes this up. Something is allowing the lamp light to pass through, and yet blocking the "coloring" of that pixel - and it\'s something that can come and go. Does this information help to narrow it down further? Thank you, Jon

  • Cirrus9 Apr 07, 2008

    This is not a CRT TV with a tube, it is a DLP rear projection.

  • Cirrus9 Apr 07, 2008

    Thank you for your reply. The brightness setting is on "Natural", and I don\'t have small dark spots, I have small pinpoints of bright white light.

  • Cirrus9 Apr 07, 2008

    Thank you, I can see your logic, and I can understand why we might consider this; however, the same spots have appeared in the exact same locations when the TV has been located in three completely different buildings, with different setups. This is good creative thinking, though, and I appreciate your input. Jon

  • Cirrus9 Apr 15, 2008

    BDG,

    Thanks for your interest... this is really interesting. One by one, the dots of light have disappeared on their own over a period of a few weeks, all except for one. Last night I was watching a movie, and the last dot was gone. Then, ten minutes later, it was back again, and then gone, then back in randomly timed cycles. Clearly this is not physical particles but something electronic turning on and off. Oddly enough, I can\'t find one scrap of information on the web that tells me what\'s happening, and nobody on this site seems to have any experience with it. Mitsubishi seems like they might cover it even without the reciept, but I put that on pause when the dots started disappearing on their own. It\'s a mystery, but one that just might fix itself.

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6 Answers

Buy a new DMD Chip for your projector should fix the white dots problem. Find a new chip at http://goo.gl/MJInrG

Posted on Oct 07, 2013

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  • Master
  • 3,422 Answers

Hi,

It sounds like you are describing deal pixels in the screen.
These show up as small dark spots. You may want to get a magnefying glass and look closely at them. They can be a single spot or a group of them.

See if the brightness level that is below the default "Normal" setting.If the the brightness setting is too high please lower it.

If you still face the same problem then the only solution to fix this problem is to get it repaired.

Goodluck,
Please don't forget to rate the soution

Posted on Apr 06, 2008

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  • Sony Master
  • 8,617 Answers

Those chassis's have been plaqued with bad capacitors on all boards. however any distortion of video can be traced to the 1000uf@16 volt capacitors on the FMT board, However due to the fact that this is apparent even without video (blue screen) your problem is the optical engine or defective lens assemly. I have done alot of repairs to those DLPs and they are difficult to work on. I wouldnt attemp it without a good service manual and alot of patience. If you need further assistance please let me know.

Posted on Apr 06, 2008

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  • Sony Master
  • 19,396 Answers

If the spot stay always in same position, and it is like they are 'holes in the glass' from which the light from projector is passing by, then it is the screen of tv tube that is defective, in this case you will probably need to change the whole tube to fix the problem. In some unfrequent case the tube is fine and you need to replace the CRT board.
If you have blurred spots appearing on screen in different positions instead, you may need to replace one of convergency IC. If additionally tones in one color are fading you may need to refill the coolant, or to replace the crt board.

Regards

Posted on Apr 06, 2008

  • Ginko
    Ginko Apr 06, 2008

    I think Mitsubishi will honour 12 months warranty, providing that you have your model number available Contact them here and find out.

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  • Master
  • 3,037 Answers

This sounds like interference.

Could be some electrical interference or maybe from any distribution or amplification that you might have.
You need to work out a process of elimination, change old needs whenever practically possible and use RG6 quad shield leads and see what happens.

Please let me know if you need any further help

Thank you and good luck

Posted on Apr 06, 2008

  • Benjamin Patri
    Benjamin Patri Apr 07, 2008

    ok, sounds good, please keep us updated

  • Benjamin Patri
    Benjamin Patri Apr 13, 2008

    were you able to fix this problem at all? Please let me know how it all turned out.

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  • Master
  • 2,267 Answers

If your TV is less then a year old, I would suggest to call the manufacturers and ask them for an authorized service center to get it fixed.
If that is not possible, the spots could only come from the light itself. I would suggest to check the light for some dust or any other particles that could be blocking the light source. The light may also have that contamination internally, if that is your case the light will need to be replace or you can leave it that way until is time to change the light.
Let me know if you need further assistance.

Posted on Mar 21, 2008

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