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Television i have replaced the hot trans, and flybacktrans........still the same problem

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HI
the base to emitter of the hot will read short on a diode checker/test on ohms it vairies but typically about 50 ohms.e to c, or b to c should have very high resistance. unsolder the collector of the hot. make sure all solder is gone. now test the ohm between your tuner ground & the pad of the hot collector it should read open.

Posted on Dec 07, 2008

  • ABHISHEK.C
    ABHISHEK.C Dec 07, 2008

    Horizontal output transistor usually has a damper diode across C and E and a bias resistor included between E and B. these internal components alter one's expected ohmmeter test of H transistor; here's how. the base to collector junction will test as a diode, but E to B will show a low resistance, approx. 50 ohms in both directions. now the E to C ohmmeter test will test as a diode. the foregoing results indicate a good transistor. readings other than these indicate a bad H output transistor.





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What is ur tv model and brand

Posted on Dec 07, 2008

  • 2 more comments 
  • mohammed marika thambi
    mohammed marika thambi Dec 07, 2008

    please make ur doubt and problem in briefly

  • mohammed marika thambi
    mohammed marika thambi Dec 07, 2008

    it might be a bad flyback. but also something in the drive circuit could
    have made it run hot and killed it. i would replace it and if it does
    fire up then the drive circuit is the problem. if it blows the output
    or just hums for a sec i would go for the flyback

  • mohammed marika thambi
    mohammed marika thambi Dec 07, 2008

    check if Horizontal Output goes hot. If
    so, check for a ceramic capacitor located near HOT, I think it is .0022 1.5 kv.
    Resistor R-3242 or RX3242 1 ohm or 2.2 ohm opens
    up near lot. IC LA7837/8.

    With the set turned off use the remote to enter
    Display, 5, volume up, power. Then be CAREFULL.

  • mohammed marika thambi
    mohammed marika thambi Dec 07, 2008

    Face the rear of the set and describe the layout
    of the circuit board/boards. One large board/two boards/three boards, location of
    the high voltage transformer/ right/left/center etc. Are boards horz or
    vertical? Look for dates on the components/picture tube/inside the cabinet.
    Sometimes there is a sticker inside the cabinet, giving the circuit board pt
    numbers. With this description, someone will recognize the set and be able to help.



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