Question about Mitsubishi Diamond WD-65831 65" Projection HDTV

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Mitsubishi Diamond WD-65831 65 in. HDTV...The picture seems clear and sharp and the colors accurate but the over all tone of the picture is slightly washed out. Like fog on the mirror, a kind of lightness or whiteness that permeates the picture. This was not there when new. Perhaps the colors lack saturation but maybe not. When you actually look at a given color it seems close. It's just this gray or light cast to the picture. It's getting to be irritating.

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First thing that you could do is to try replacing the lamp because old lamp affects the overall picture quality :))

Posted on Apr 14, 2009

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There is process to clean inside the unit the dust already in the refexion area, This is not a really deep process (electronic) because is actually "external" (inside the projection area) but extremely care has tobe taken when open the unit to get inside the projection area (the screen has tobe release, and any damage to this part can drives you to buy an extremely expensive part). I hardly recommend to ask for a cleaning to a technician. after cleaning you wont recognize the tv color live back.

Posted on Apr 14, 2009

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1 Answer

I have a WD 65831 Mitsubishi television. I love it and have had NO problems so far with it. The picture and letters on the screen seem slightly fuzzy (out of focus). I had the bulb burn out and I replaced...


Projection TV sets have two very common problems oulined below.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • No Audio/Video - TV Makes Chirping Sound
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc

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you have either a defcetive signal pwb, FMT pwb or light engine. Does the menus appear clear when you press menu?

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Mitsubishi Diamond Series T.V.


When a tv (Rear proyection) shows this coloration is the meanning that the red color is not there (the red color is generated by a red CRT). Now it can be really bad not having the tube working but before conclution make sure of this: (and if the red color gets back then the tube is ok)
  • is this condition the same in all inputs? or the picture looks ok with a different video source (VCR, DVD other)
  • are the menu letters same as the picture looks or are they fine?
If we cannot see any red color back with this testing, still chances that a technician find an electronic problem that make the tube to be off. so don't rush conclusions and get to the end to save the tv with out replacing the red tube, but if all was done and nothing then the tv needs the tube replacing.

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one the whole screen,if not that,I have heard mold growing on and the inside of the blue bulb because it runs the coolest out of the three.

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Had the same problem. Service replaced the lamp engine. It did help.

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Good Day;

Try resetting both devices TV & BOX, unplugg power for 2 to 5 minutes then plug back in.

good Luck, big IRISH.

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Good Day;

More then likely your 2005 MODEL has a bad "LIGHT ENGINE". Call an Authorized Service Center and have them give you an estimate, then call MIT's and try to get them to give you a "CONCESSION". It's costly. Good Luck, big IRISH.

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Sounds like one of your colors are missing. make sure all colors are lit, Blue, Red, Green

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