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The Sony Trinitron won't start,..

Discussion in 'Electronic Repair' started by [email protected]_ing_swave.com, Apr 18, 2006.

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  1. Hello, when we push the power button there is no response; nothing
    lights up at all. My neighbor said if he remembered to just push the
    button once it would all of a sudden come on by itself after a half
    hour or so and everything would be fine.
    I removed gobs of dust and checked the fuses a wiggled the
    wires/connectors. The ON button is kind of pressure button that runs a
    flip-flop circuit but disapears into the maze. The power section has
    ac but no dc. I was hoping this is a common problem or easy fix for
    someone familiar with tv repair. Thank you.
     
  2. JANA

    JANA Guest

    Thermo sensitive parts. After the power is on for a while, they heat up and
    drift close enough in to specs. When cooled down, they are out of specs.
    Most of the time, it is capacitors that can become thermo sensitive with
    age.

    --

    JANA
    _____


    Hello, when we push the power button there is no response; nothing
    lights up at all. My neighbor said if he remembered to just push the
    button once it would all of a sudden come on by itself after a half
    hour or so and everything would be fine.
    I removed gobs of dust and checked the fuses a wiggled the
    wires/connectors. The ON button is kind of pressure button that runs a
    flip-flop circuit but disapears into the maze. The power section has
    ac but no dc. I was hoping this is a common problem or easy fix for
    someone familiar with tv repair. Thank you.
     
  3. I.F.

    I.F. Guest

    The most common cause of this type of symptom is the start up resistor going
    high in value. Whatever chip the PSU uses must have some form of Vcc supply,
    once the PSU is started this supply comes from a winding on the chopper
    transformer but to get started in the first place there is usually a high
    value resistor from the reservoir cap +ve to the chopper chip, value varies
    depending on design of circuit and is often 2 resistors in series and can be
    anything from abou 68k to 180k.
     
  4. Andy Cuffe

    Andy Cuffe Guest

    Depending on its age, it could be a problem with the power relay, or
    the circuit that controls the relay. I've seen power relays in Sony
    TVs that no longer close reliably.
    Andy Cuffe

     
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