Question about Mitsubishi WS-55809 55" Rear Projection Television

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Blue Screen/Waviness I recently received a Mitsubishi WS-55809 55" rear projection big screen. After one day of use, the screen had a pale blue tint and then shut off. Now it has a blue screen with intermitant waviness and shows no picture (audio is fine). Occassionally after the TV has been off for a few hours, the picture will return with the blue tint and sporadically work. Any suggestions?

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Re: Blue Screen/Waviness

Sounds like convergance ic's mits is also know for bad caps
1000uf @ 16v check for bulges on top of the cap

Posted on Jan 05, 2008

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Mits. rear projection tv ws65905 picture has blue color tint

Your blue picture tube is failing. Invest in a new TV. "If" you can find a new set of tubes(you have to replace all 3 red blue and green) they are around $800-1000. Not cost effective. Run the TV into the ground if you want to wait but do not invest any repair money in my opinion.

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I'm not clear on this. When does it show a blue screen? When you have it in HDTV mode? A Blue Screen means it's not getting a signal (or the signal is very weak, resulting in more static than picture). If it is a blue screen for HDTV, how are you sure the HDTV receiver is working? If you can answer those questions for me, I should be able to track down the problem. I'm not sure which direction to go yet.

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10 yo mitsubishi big screen rear projection has blue lines rainbow shape top to bottom in the middle the rest of the screen is tinted and dark

A little more information would be helpful but take a look at some photos and see if they look ANYTHING LIKE your problem,

If they do you have a convergence problem and an exact model number would allow me to assist here more.


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Good Day;
From what you say it sounds like the Convergence IC's have failed. Part number 267P150010, STK392-570, replace both IC's. They are on the middle board secured to a large heat sink.
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This model is known for the tubes leaking fluid, glucose, on the PCB. Check the front of the chassis for said fluid, it may be only a drop, so look closely.
To fix, after TV has no power, try cleaning the board with cleaner and brush, let dry. I suspect this because of multi unrelated problems.

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Good Day;
Blue screen that has gotten worse over the past few days, I would suspect fluid on your signal board.
The three CRT's in the TV has coolant that tries to keep them cool but they have a problem with the 'glycol' leaking out of it's chamber.
Take speaker grill off, remove panel and look on the right side of opening. Look for fluid on the board, shinny substance, it's hard to see so look closely. That is the most common problem.
2&3 are the CRT's or the CRT's drive circuit.
Good Luck, Day,let me know, Big Irish.

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