Question about Mitsubishi WS-55805 55" Rear Projection Television

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Sound but no picture

My 55805 has sound but no picture when it is turned on. I took off the front cover and looked for coolant leakage under the tubes per a suggestion to someone else's issue. I did not see any signs. Any suggestions? Thank you.

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Hello..the first thing I would troubleshoot is the lamp, check if it is burnt out or just not seated to the ballast correctly. It could also be your ballast is going bad too, may need to replace it. Or it could be your color wheel is going bad if it is not spinning. But if your color wheel is not spinning it could also be your DMD board (digital mirror display) has gone bad also. Wish I could be more specific but this could be one of many different things going bad.

Posted on Apr 18, 2008

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Television has sound but no picture.


The liquid is actually CRT coolant dripping down onto the circuits. It will need to be cleaned with denatured alcohol and then dried good. Then any components in the area where the liquid was will need to be resoldered as the coolant will destroy the solder and the circuit traces if left too long as its highly corrosive to solder.

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It sounds like the color wheel is beginning to fail. I would recommend calling a technician to repair this problem. You can call 1-800-samsung to find the closest service center.

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First thing I do on these is to disconnect power cord,pull off the front speaker grill and remove the small door covering the tubes. Get a bright light and look for coolant leaking down from the metal shields that cover the high voltage anode on the picture tubes. There is a chamber on each tube that contains ethylene glycol or antifreeze to keep the tubes from overheating. Sometimes the gaskets get a leak and coolant drips down onto the circuit board. Look very closely at the board to see if there are any drips below the tubes. If this is the case you may consider replacing the set but some can be saved by cleaning the board and sealing the leaks. Have a pro look at the tv if this doesn't help because all you can get online is a guess. Second thing that could cause this is a failure in the vertical or convergence circuit that would entail part replacement at a cost of 200-300. If you find no coolant on the circuit board that means the convergence circuit or the vertical circuit needs to be rebuilt. These sets are known for having bad capacitors on the boards that eventually have to be replaced when a failure occurs. Good luck, Russmann.

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usually the scenium tvs that rca produced had coolant leakage and small signal board issues.. call a tv service shop and have it looked at..

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that is not and easy problem U need experienced tech to take a look at your TV call a local TV shop

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If you are willing, remove the speaker grill and the rectangular board behind that and look very, very carefully underneath each of the three picture tubes for evidence of coolant drops on the printed circuit boards. These sets have been known to spill a few drops of coolant onto the boards and this causes intermittent problems such as yours. This is my first direction in your case. Let me know.

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OK WHEN A BORD GETS SHORTED OUT LIKE THIS IT MOST LIKLY CAUSES PROBLEMS WITH OTHER BORD'S AND COMPONETS BECAUSE I WOULD GUESS THAT IT SENT A SERG THROUGH MOST OF THE SYSTEM I HATE TO SAY IT BUT I THINK ITS REDY FOR THE TRASH UNLESS YOU WANT TO SPEND THE $ ON THE PROS

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call a tech to repair you tv it is having problem in the power supply or related circuit.good luck.

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