Question about Mitsubishi WS-55857 55" Rear Projection Television

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Mitsubishi WS-55857 55 Turns off

My rear projection TV turns off after 30 or so minutes. I have run a fan on the boards trying to cool it down, but it does not seem to take a difference. Any help?

Oh, I am not sure if its related, but the picture kinda pulses a little bit. I don't think there is a time correlation between when that happens and the TV turns off.

Thanks for any help,

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Re: Mitsubishi WS-55857 55 Turns off

I have the same problem and it is costing me $300 to fix it. Not that big of a deal but a pain none-the-less. I'm sure we aren't the only ones that have found defects with this television set.

Posted on Feb 13, 2008

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Let me know as I can look for this---the set has a keyboard lockout that is cleared by holding the menu or another front button for more than 5-10 seconds with set on---I can find the service manual and check if needed.

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This can be due to poor solder joints that develop over a period of time with constant heating and cooling thereby the solder becomes DRY and so non conductive. So if you can make a good observation and when the set starts up if the TV is tapped on the board then this is confirmed. Use a good soldering iron to carefully solder such dry solder joints, take precaution not to bridge the connection.
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You can simulate and confirm by heating with a hair dryer.

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Hello There, Its seems that the circuit board has problems. You'll have to get it replaced ASAP before the board is ruined completely.
The same thing also happened to me 2-3 weeks ago. the techs came in and had to replace the board since 1 circuit was damaged.
It will cost around $100
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Probable four bad caps in DM module = 1000mf/25v
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