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Mitsubishi ws-65809 concave picture

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The soldering comes loose on the STK ICs in Mits's, sometimes actually coming loose INSIDE the IC, where it solders in there! Heat/cold over and over translates into expand/contract over and over.

Just resoldering the legs usually does the trick, but if you have continued to use your set while hurt, the ICs will eventually go out completely and need replacement. Resoldering them in before that time usually saves the ICs and never needs to be done again.

My questions is where are these STK ICs? What do they look like? What tis the soldering process?


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  • Edog2008 Jun 11, 2008

    Left Board

    Center & Right Board

    Right Board

  • Edog2008 Jun 12, 2008

    Mr. Bob,

    I'm not sure if the text went through with the pictures. I was trying to do as you instructed, but couldn't find the ICs. I took three pictures in hopes of sending them to you for identification of the location of these STK ICs.





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There will be either one or two of them, and they will be heavily heat sunk - as in mounted on a big heat sink, with vertical fins. That's all I can say without seeing the unit in front of me, open. They usually face towards the front, are in the middle of the middle board, and the name of the ICs is covered by a screw-on plate, which has to be removed for replacement.
Be generous with the heat sink compound when replacing the ICs, get the old stuff offa the heat sink with a putty knife if it has dried out.

To check whether you need to replace the ICs or not, with the unit on if you tap on the heat sink with something long and not conductive, like a stick, and it affects your conv - be VERY careful, this has to be done while the unit is on - you can probably get by with just resoldering the legs. If not and it just won't converge, IC replacement will be necessary. I recommend replacing both if you replace one, because next week the other one may go out and you may have to get in and out of the unit all over again.

Best way is usually to remove the entire light box, tho sometimes it's best to remove just the board, other times you can prop the whole board up and do the resoldering on your back.

Mr Bob

Posted on May 26, 2008

  • Robert Jones
    Robert Jones Jun 13, 2008

    They are/it is mounted to the biggest sink on the center board.

    I believe the xxx09 series uses the STK 393-110, which is the all in one chip, with all 6 channels on it.

    Soldering is touching the soldering iron to the legs of the IC and adding solder or using a solder ****** on it for removal of the solder. You can gtet one cheap at Radio Shack. Many times the guys behind the counter are aspiring DIYers, and can let you in on hints about how to do it right. If you want a full course on it, you can always sign up for a coaching session with me.

    Use a wet sponge to be sure and get the tip of the soldering iron clean and to cool it to the proper temp for each soldering op.

    Be sure and be generous with the heat sink compound when replacing ICs mounted to heat sinks, getting all old, dried out compound outa there before installing the new. If it's still supple and basically wet, you can use what's already there. If there's any question in your mind, just scrape it off with a putty knife and replace it with new compound.

    Mr Bob



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