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Samsung hcm4215w projection tv

Discussion in 'Electronic Repair' started by jimmyjet, Sep 29, 2007.

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  1. jimmyjet

    jimmyjet Guest

    I have a rear projection tv I'm trying to get running. Originally it
    wouldn't stay on. If I unplugged the convergence board it would stay
    on. I bought two new stk392-040's and installed them. The right hand
    side ic would get really hot really fast. So I took that one out and
    installed one of the older ones and the tv works now sort of. The
    picture is really bowtied shaped.
    Should I order another stk392-040 and try that, or order a replacement
    convergence board?
    Thanks for any help.
  2. Meat Plow

    Meat Plow Guest

    In any event be careful with samsung sets as some can burn the crt very
    fast when you have problems with the convergence. Also make sure you use
    the exact replacement STK and clean the heatsink surface and use proper
    thermal goop. Myself I would go over the converge board with a fine tooth
    comb and look for low value 1/10 watt resistors that may be damaged and
    replace before trying another STK.
  3. jimmyjet

    jimmyjet Guest

    Thank you for the reply. I bought the stk ic's from mcminone. It had
    the same numbers except for the date code. Someone else mentioned I
    should use panasonic stk's, but I haven't found any yet. The heatsink
    had an insulator on it and no thermal goop. Do you think I should use
    goop with the insulator?
    I will check the resistors.
    I appreciate the advice.
  4. Meat Plow

    Meat Plow Guest

    The general consensus is use exactly what the factory used for replacement
    as in order the parts from Samsung if at all possible. However,I did not
    do that with my own personal Panasonic 53" rear projector and used chips
    that were actually on sale from MCM. I've had no problems with it and it's
    been several months and many hours of operation ago.

    Also replace the chips the same way the factory installed them. If they
    use insulators without conductive paste, do the same. And look close for
    low value resistors burnt. I mentioned 1/10 watt but the could be smaller.
    The ones that burnt in my Pana were all 10 ohms.
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