Question about Mitsubishi WS-65869 65" Rear Projection Television

6 Answers

WS-65869 turns off after 3-4 secs.

When I turn on the set I hear a relay click on and the green light on the front panel light up after 3 - 4 secs the relay drops out and the tv shuts down. When the problem 1st occured the tv was on and it went solid blue then it turned off. The relay that clicks in/out is near a 5 pin IC STR-G6623. I read in another post this IC is a regulator of some sort, where can I get ahold of a schematic for this tv?

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  • Bill Schatz Dec 13, 2008

    Extra info: I was able to download schematics, and I found fuses F9A02 & F9A05 (+24V & -24V) were blown. I tried replacing the fuses and the TV stayed on longer, but the fuses blew again and the TV shut off.

  • Bill Schatz Dec 13, 2008

    I made an error in my extra info post it should have read fuse F9A04 for the +24 volt.

    As to the solution provided, in the service manual there is an 11 pin IC listed as the HV regulator, and there is a large FET/Transistor which were you suggesting I replace?

  • Bill Schatz Dec 13, 2008

    The TV shuts off in less than 10 seconds, and if I replace the +24V & -24V fuses the TV stays on until the fuses blow.

  • Bill Schatz Dec 13, 2008

    I agree with the dufficultly of fixing problems long distance. I have a DVM & a scope and a soldering iron. The Main fuse is good and so are all the stand-by voltages and fuses (6V, 12V). On the switched side the 17 volt Audio fuse is good, & the 110 volt fuse is good as well.

  • Bill Schatz Dec 13, 2008

    Sorry I'm new to how this works. I have downloaded both the schematics & service manual for this TV. I do appreiciate your suggestions and I'll see if I can find a bad cap somewhere in the 24 volt circuit.

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There may be some damaged IC and try to replace it.thank you

Posted on Dec 13, 2008

  • JITHIN ANTONY Dec 13, 2008

    the manual can be here manualsonline.com

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Https://www.manualsparadise.com/ShowProductsForModel.do?model=M68648953
you can purchase the service manual for a small fee at this website. Definitely a smart investment.
I believe this a bad capacitor in the power supply, and yes it could still turn on and the fuses would get tripped just like this. Start there. Should not be more then 300$ for a professional. If you need any further assistance please let me know. Also please take a moment to accept and rate my solution accordingly.
Thank you,
Lee

Posted on Dec 13, 2008

  • Lee A.
    Lee A. Dec 13, 2008

    Though if you have a transistor/diode checker I would check the horizontal transistor and then if that is bad and you hear a clicking at all it may also be your flyback transformer/horizontal transformer. You may need to change them both as one takes out the other. Please take a moment to accept and rate my solution accordingly.
    Thank you,
    Lee


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Based on your description, the most likely diagnosis is a failure of the power supply stage although please understand that TVs are quite complex and diagnosing one without being in the same room is not easy.
This area of the TV comprises some fuses, a bridge rectifier (4 diodes) a couple of capacitors, fusible resistors and a regulator. All are prone to failure.

That stuff can be checked quite easily if you have a multimeter and a soldering iron. Is this something you think you are capable or willing to do?

The first thing to check would be the main fuse.

If you don't feel comfortable doing this, the repair cost will likely be between $200 and $400.

Posted on Dec 13, 2008

  • futureloginn
    futureloginn Dec 13, 2008

    ok,
    change HV regulator fixs your problem.

    Thanks

  • futureloginn
    futureloginn Dec 13, 2008

    change HV regulator fixs your problem.
    cost will likely $300

    Thanks

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One of the control boards has shorted, you can try to disconnect the boards one by one till its stays on, that will tell you what board is failing, also look for any charded marks, if you have a meter you can start loking for shorts, doubt it is the power supply if it came on with the fuses replaced,

Posted on Dec 13, 2008

  • 2 more comments 
  • Justin Washburn Dec 13, 2008

    i would start with the bards near the picture tubes, as these are high voltage circuits, using the schematics follow the trail and see what uses the 24v, its the best starting point.

  • Justin Washburn Dec 13, 2008

    if the hv regulator fried it would have visible signs of damage, check it for open/ short .

  • Justin Washburn Dec 13, 2008

    same goes for the transistor, if you get a dead short then youll knwo which to replace.

  • Justin Washburn Dec 13, 2008

    look for swollen caps, tranistors will need to be tested for continuity, can you post the schematics for me?

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Check your sleep mode settings on it, it may have defaulted to 1 min, so it cuts off when it cuts on

Posted on Dec 13, 2008

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This sounds like the flyback regulater on the main board is burnt out! (the part is around 70.00 go to www.sears.com and have make and model readt they should be able to get you the part and the scematicThis should fix ya! thanks for useing us!

Posted on Dec 13, 2008

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