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Sony TV High DC Output Voltages

Discussion in 'Electronic Repair' started by Andy, Jul 18, 2005.

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  1. Andy

    Andy Guest

    Having successfully repaired a KVM-2131U recently (faulty non electrolytic
    in horz output) I noticed all the DC output voltages were high. (+B was 165V
    , +7v is +11V ) I compared them with those on a working KVM-2121U ,(almost
    identical inside) , these were all high by the same amount. Can someone
    give me the correct voltages for both please?
     
  2. Guest

    Since it is a Sony, +B should be 135V. Only a few models have lower +B,
    never seen anything higher.
     
  3. Andy

    Andy Guest

    Thanks Maarten,
    It is funny that both TVs have the same voltages ,and that the voltage
    markings on the main PCB are lower values , anybody else got any ideas
    please?
     
  4. Guest

    Too high a voltage can be caused by a 100k or 150k resistor in the
    feedback circuit (R522 in AE-1B and AE-1C chassis, not sure what chassis
    you have) drifting off-value. Also, double check your meter is
    functioning properly, since it also reads high on a good working TV set.
     
  5. kip

    kip Guest

    Where are you measuring these voltages..?/

    kip
     
  6. Andy

    Andy Guest

    Problem solved!! I was using a digital meter , Voltages were 135, 20 and 9
    using an analogue Avometer !!! Thanks for all your help
     
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