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philips tv 21PT128A/71R unstable B+ power supply

Discussion in 'Troubleshooting and Repair' started by abs, Sep 21, 2012.

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  1. abs

    abs

    2
    0
    Sep 21, 2012
    philips tv 21" unstable secondary B+ power supply and blinking red light...pls. help thanks.
     
  2. davenn

    davenn Moderator

    13,901
    1,971
    Sep 5, 2009
    Hi abs
    welcome to the forums :)

    so what tests have you done so far to check the TV PSU ?
    have you looked for a service manual or at least a schematic online ?

    what voltage is the B+ supply supposed to be ?
    what is it dropping to ?
    is it pulsing or just only periodically firing up or not firing up at all ?

    have you taken the back of and done any voltage checks ?
    have you looked to see if there's any obvious damage to any components
    like bulging electrolytic capacitors ?

    there's a bunch of questions for you to answer so we all have at least a bit of a chance in helping you :)

    cheers
    Dave
     
  3. abs

    abs

    2
    0
    Sep 21, 2012
    unstable B+ power supply

    i voltage checking..
    i have no schematic diagram online or service manual..
    the voltage is range at 125volt..
    it is pulsing or not stable..
    i already done voltage checking..
    i see damage component the power supply transistor # 6N60FI and it is OPEN..
    i also check all the components at the power supply its OK..

    thanks for helping me sir dave...


    Abs....
     
  4. davenn

    davenn Moderator

    13,901
    1,971
    Sep 5, 2009
    take a sharp well lit pic of both sides of the PSU board

    6N60FI sounds like a power MOSFET will have to look for a datasheet
    Yes it is ... the datasheet is here


    cheers
    Dave
     
  5. davenn

    davenn Moderator

    13,901
    1,971
    Sep 5, 2009
    OK on one filipino forum ... I had to get my wife to do some translating .... They were talking about a number of possible problems in the PSU that would cause the blinking red LED

    1) .... 2 x 47uf/160v on the B+
    2) .... R3523 = 390K
    3) .... D6519 = BTZ03 -C15
    4) .... and from what we caqn read there's a main regulator chip that periodically fails
    and a couple of other reg's 7805 and 7808 possibly to check


    Dave
     
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