Question about Mitsubishi WS-55807 TV

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TV POWER ws55807

Guru sent me a solution, but that does not help. This TV does not power-up, therefore I cannot try the "input/device and menu" front panel diagnostic. There is absolutely no power indication (green light) at the front of the TV, thus it does not shut down.
The input fuse is okay.

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  • bajangolfer1 Oct 05, 2008

    Big Irish sent me a solution, but that did not help. I checked D9A31 for short and R9A33 for open on the power board. I noticed however, that there is no +5, no +12 and no 24 volts. The only voltage I was able to get was 220 and 136 at D9A21. I do hear a faint sound similar to that of high voltage when I turn the TV on and OFF.

    Again there is no power light at the front of the TV and the TV does not come ON. Thanks for helping.

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GOOD DAY; TRY THESE CAUSES: Cause #1 1. CHECK IC7A00 PIN 53 FOR LOW LOGIC (0 VOLTS), IF HIGH (3.3 VDC) CHECK FOR SHORTED D9A31 PART # 264P045050 AND OPEN R9A33 220 OHM 1/4 WATT ON THE POWER PCB. Cause #22. More than likely your TV has "COOLANT" (ethylene glycol) on the circuit boards. This fluid comes from the CRT's (picture tube) this fluid is used to keep the CRT's cool, such the name. This fluid from the CRT's leak when TV is on for long periods of time, the chamber expands and the seals leak.

One can remove this fluid by using "acetone" & small brush. The fluid is hard to see, use bright light, they spots can be smaller then a DIME. Also, the fluid can corrode the parts and traces on the boards. To protect the TV in future place heavy plastic or thick cardboard over affective area, make sure TV has proper air flow around TV.

If after the fluid has been removed and TV still does not work, call an Authorized Service Center to come out and repair TV after giving you an Written Estimate. The boards are not available.

Always try resetting the TV by unplugging it for one minute then plug back into A/C outlet and ALWAYS UNPLUG TV BEFORE ATTEMPTING ANY REPAIR ON THE TV.

Good Luck, big IRISH.

Posted on Sep 28, 2008

  • Tim Sep 10, 2011

    Is there any way to get an IC7A00 (p/n 275P497050) or the whole main board (p/n 930B866007)?

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