Question about Mitsubishi WS-55511 55" Rear Projection Television

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No reading on Horizontal Output Transistor...power supply?

After following your guidance, I found the DM Power Supply still had a green light lit up, nothing seemed blown, blackened or swollen in the DM panel. The Horizontal Output Transistor did not show any activity on the meter. Is this the part to replace, or is it the Power Supply itself, and who should I buy it from?
-Thank You

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  • getsarge Aug 25, 2008

    I am unable to locate your original posting, do you mind reiterating what the next step is?

    Thank you,



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I have provided the next step in the original posting. I'd rather kep the discussion there to maintain the context of the entire problem.


Posted on Aug 25, 2008

  • ABRsvcs Aug 25, 2008

    The noise you are hearing is from oone or more parts in the switch-mode power supply that are oscillating. If this is all you get when attempting to startup the set, the problem is in the power supply itself or it is a dead short further along. The power supply it trying to work and failing. The first thing to check is the horizontal output transistor. This is a 3-legged part attached to a heatsink and shouldbe close to the flyback transformer (part with large red wire coming out of the top). Check this using an ohmmeter. You should read resistance when measuring between either outer leg and the center. If any of those read zero(0) in both directions, the part is bad and should be replaced.

    Try that first. If that fails to resolve the problem, update this and we'll continue on to the next step.


    Comment by Abrsvcs, posted on Aug 25, 2008
    Perhaps you mis-understood. Since the set is not powered up, there will be no voltage at the horizontal output transistor. You need to make the measurements I outlined above with the set unplugged.

    Second: If the power supply does not kick in at all and the transistor measures OK, then we need to look at the power supply area itself. Close to the area where the AC cord connects to the board you should see some capacitors that have a value in the 2.2-4.7ufd range with a working voltage of 200V or more. Try replacing those caps and report your results here.



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