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Mitsubishi VS-50805 bad convergence.

Discussion in 'Electronic Repair' started by [email protected], Aug 25, 2006.

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  1. Guest

    I went out on a service call for a friend who owns this Mitsubishi
    VS-50805.
    I turned on the set and noticed that there is severe inward bowing on
    all
    four sides of the picture. The convergence controls that are accessible
    to
    the consumer, do not affect anything. I looked for bad capacitors and
    poor
    soldering but it looked in pretty good shape. I put the set back
    together
    and told the patient friend of mine that I'd do some research and get
    back
    to him. I found the following thread on another repair group forum:

    <message 1>

    This being a 2000 model set, I don't have any service
    lit.close to this model.The set has gross mis-converg.
    I found resistors R8E00 & R8E03 Burned beyond recogin.
    They appear to be in the +35V line to the convergence
    IC's IC8D01 &IC8D02. (P/N STK392-040)I'M suspecting
    the IC's are bad and took out the resistors.If any one
    has any suggestions on this model or circuit (or
    possibly any tips from Mitsubishi),please reply? I'm
    ordering service lit. on it tomorrow but maybe I won't
    it with a little help.If someone has the values of the
    resistors I may be able to finish it up? Thank you in
    advance. Jess @

    </message 1>

    <message 2>

    Both R8E00, And R8E03 Are 120 Ohm/ 1/2 Watt AAnd Are In The +33 Volt
    Line.

    </message 2>

    <message 3>
    (posted by original poster)

    Changed the 2 burned resistors and shorted IC's. after
    getting service lit. found i was missing the + & - 24v
    to the IC's. Changed the 2 circuit protects to get the
    voltage's back and everything functions normal.

    </message 3>

    Can somebody please tell me the part number of the two circuit
    protectors?

    Thanks for your reply.
     
  2. Nothing special, just a 5A pico fuse. Mits # 283P043090

    Replace the outputs, STK392-040, the resistors if needed and the fuses and
    realign.

    Leonard
     
  3. David Farber

    David Farber Guest

    Hi Leonard,

    Thanks for the info. I'll put the parts in and report back.
     
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