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Mitsubishi VS-50703 does not turn on

Discussion in 'Electronic Repair' started by chaseme5, Jan 30, 2005.

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  1. chaseme5

    chaseme5 Guest

    I have owned this set since 1998. I had the power supply replaced last
    year. The set was working great. I watched a movie the other night with no
    problems. The next day, the tv would not turn on! This is what happens,
    you turn the tv on, the green light comes on and immedaitely the green
    light turns off. No Picture, no sound. If I unplug the power recepticle
    from the wall and then plug it back in, there is a spark between the
    polorized plug and the electrical outlet. This happens when the tv is not
    even on! Has someone ever ran into this problem before. Are repair manuals
    avaiable for the Vs-50703? Any info on this matter I would appreciate!
    Aaron
     
  2. Jerry G.

    Jerry G. Guest

    You may still be able to order the service manual from Mitsubishi. You would
    have to call their parts department to find out.

    It sounds like there is a failure in the main power supply, scan protection
    area, and or the horizontal output stage, or in the microcontroler circuit
    area. Most of the time, it is the power supply and or the scan amplifier
    sections that give these types of failures.

    You would have to get the service manual, and follow it up with a DVM and
    scope to trace out what is going on.

    If you are not experienced in TV servicing, and not properly equipped, you
    should give the set out to have a proper estimate. From this you would be
    able to make an intelligent decision, if the set is worth it or not to
    service it. Considering the age of the set, I would be shopping for a new
    one.

    --

    Jerry G.
    =====

    I have owned this set since 1998. I had the power supply replaced last
    year. The set was working great. I watched a movie the other night with no
    problems. The next day, the tv would not turn on! This is what happens,
    you turn the tv on, the green light comes on and immedaitely the green
    light turns off. No Picture, no sound. If I unplug the power recepticle
    from the wall and then plug it back in, there is a spark between the
    polorized plug and the electrical outlet. This happens when the tv is not
    even on! Has someone ever ran into this problem before. Are repair manuals
    avaiable for the Vs-50703? Any info on this matter I would appreciate!
    Aaron
     
  3. Art

    Art Guest

    BTW, Almost every tele has a standby power circuit that is powered on when
    plugged into the mains, therefore a small spark when plugging the cord into
    the outlet is normal.
     
  4. John Del

    John Del Guest

    Subject: Mitsubishi VS-50703 does not turn on
    Are repair manuals
    The manual is probably discontinued, but I doubt it would help you. The
    service manual is not a "how to" repair guide. You would need many years of
    training and practical knowledge to make any use of it.
     
  5. chaseme5

    chaseme5 Guest

    I was looking as the main board if the mitsubishi VS 50703 and noticed that
    I saw clear fluid on the board. An aluminium heat sink is corroiding due
    to the fluid. Is this what happens when a eletrolitic cap fails, they leak
    fulid? Can this damage other parts.
     
  6. bubbajim

    bubbajim Guest

    ent.com:
    A tube has leaked glycol onto the deflection (?) module...personally I
    would estimate the module as well as the afflicted leaky tube and about
    $300 labor...ya gotta remove ALL the crt's and the associated mounting
    bracket because of the convoluted way that Mits mounts their crt's.
     
  7. It is NOT necessary to remove all three tubes. I just changed one two days
    ago and it was very easy. Four screws, pull the yokes and the VM coils and
    it is out. You may be thinking of one of the earlier sets with a lot of
    extra shielding around the tube bulkhead. Mitsubishi tubes have been very
    easy to change for years now. We rarely have to change one, however, except
    for coolant leaks.

    Leaks on the deflection board are easy to fix...single layer board, large
    scale circuit. Leaks on the signal board are not so simple and often not
    repairable on these sets.

    Leonard

    =----
     
  8. chaseme5

    chaseme5 Guest

    Exactly, A tube has leaked glycol onto the deflection (?) module. How did
    you figure this out? I call a shop and they quted me $ 800.00 due to the
    corrosion on the board and said a 3 day job at $60/hr. Would give me a
    discount. @ $800.00
     
  9. chaseme5

    chaseme5 Guest

    Exactly, A tube has leaked glycol onto the deflection (?) module. How did
    you figure this out? I call a shop and they quted me $ 800.00 due to the
    corrosion on the board and said a 3 day job at $60/hr. Would give me a
    discount. @ $800.00
     
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