Question about Mitsubishi WS-55807 TV

1 Answer

Won't turn on

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.

Posted by on

  • TV_ITGuy Dec 20, 2007

    I replaced both of the convergence IC's. I bought 2 Sanyo IC's from Audio Labs of Georgia STK392-570's for $ 20 each.

  • TV_ITGuy Dec 20, 2007

    Thanks I will check the items mentioned.

    Also, do yu know the circuit logic behind the K9A50 relay opeing and closing. Is there a way to determine what the control unit is not seeing that tells it to shut down the P-ON signal?

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  • Master
  • 1,694 Answers

The five amp fuses are very fast acting pico fuses, by design.
You say you replaced both convergence IC's or not?
Let me know....T.

PS What quality,price and part # IC's.....?

Posted on Dec 19, 2007

  • Vista Electronics Dec 20, 2007

    You chose well ! Now you are probably going to isolate.......

    How about checking each active component in power supply...

    then check electrolytic caps....You no doubt already checked

    all the other fuses...Then check every component that the B+

    and minus voltage sources that drew hard current touches...any

    peaking coils,resistors,etc .....one part open will shut you down................................................T.

  • Vista Electronics Dec 20, 2007

    Re-check your own soldering of IC's and re-check IC's pin for pin

    comparison for shorts.............................................................

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To get a service manual see link
Download Mitsubishi WS-55807, WS-65807, WT-46807, WS-55857, WS-65857, WS-55907, WS-65907, WS-73907 Service Manuallockmanualsdnw_en.gif
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Check for voltage at the end of your power cord. If you find voltage there next check for voltage on the other side of your glass type fuse.This will most likely be your problem.

good luck-------------------------tomtaso

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