Question about Mitsubishi WT-42313 42" Rear Projection HDTV-Ready Television

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Mitsubishi WT-42313 TV

I have a problem with my TV not powering on. It clicks and lights green on indicator but then clicks off and stays black on screen. It won't power up at all.
Did you get yours fixed?

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  • dgish Nov 02, 2008

    I have the same problem. I've determined the 5A -24v fuse on the main power supply board is blown; the rectifier diode shows evidence of getting hot, so I assume there's a high current problem, probably over on the main high voltage board. Looking for a schematic.

  • sfollese Feb 23, 2009

    Mr dgish had the correct solution, the fuse is not easy to identify for a novice, it looks like a a resistor that is green and is soldered into the circuit board for the power supply F9A03 and or F9A05.
    It was very helpful, the fuse had blown as well.
    You will need equipment for de-soldering components to get the old parts off of the circuit board.

  • Anonymous Mar 18, 2009

    HOw do you know if the fuse is bad? The little green ones. I have the same problem and I have located the fuses, but cannot tell if they are bad. Also, how do you know if the IC is bad?

  • hakreiter Mar 18, 2009

    HOw do you know if the fuse is bad? The little green ones. I have the same problem but cannot tell if they are bad. Also, how do you know if the IC is bad?

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I found the schematic (downloadable PDF) for $7.99 at http://www.completeservicemanuals.com. Cheapest I found and highly recommended.
The blown fuse was due to a fried convergence IC. There are two of these on the high voltage board; they should be replaced together as a matched set. The bad one had gotten so hot I only had to unsolder three pins -- the rest were already loose!
I found the ICs at http://www.electronic-repair-kits.com, also highly recommended. The correct part for the WT-42313 is STK394-250. Make sure you order a pair and they will send you a matched set.
My set is now operating; I just need to clean the optics and do a convergence alignment.

Posted on Nov 18, 2008

  • dgish Nov 18, 2008

    BTW, I also found the 5A Pico fuse at www.electronic-repair-kits.com. The only other thing I needed was heatsink compound, which I picked up at Radio Shack for $2.99. Be sure to clean off all the old heatsink compound before applying the new stuff.


    Total repair cost including manual, chips, fuse and heatsink paste: about $50.


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Mine was a power converter/supply issue. I took it in and 300$ later it was as good as new.

Posted on Nov 13, 2008

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