Question about Mitsubishi WS-55807 TV
So my 55807 won't turn on so i took the back piece off to see if I could find anything wrong with it. Anytime I go to plug it in all i do is here a click from inside the tv but nothing happens. Suggestions? Anything that I can do for like process of elimination?
I have the same problem with a ws55807. I started checking power to the unit with a voltmeter. For those intersted I have attached scematics: I verified that the PCB main fuse is good and there is 120V at point PT. From what I can tell is happening, the power button is pressed and the P-ON transistor is given a signal to conduct which causes K9A50 to close. K9A50 opens after about 3 seconds.
I am looking for other troubleshootinng steps. I have checked fuses F9A01 and F9A06, both are good. What are some other things to check for? Where does the P-ON signal come from.
In the switched supplies regulator circuitry I found fuses F9A04 and F9A05 blown. I jumpered around F9A04 and F9A05 with good 5A fuses and the TV powered on. However when the set was plugged into an outlet the was a huge power draw.
The TV stayed powered on for about 30 sec and then powered down.
I pulled the middle PCB whichs holds these circuits and I found the
D9A60 diode open and IC8C02, one of the convergence IC's fried. I don't know if these were like this before or after jumpering.
I replaced all bad components and I am back to square one. The K9A50 relay stays closed for 3 sec and the set does not power on any further.
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Posted on Jan 02, 2017
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