Sony Bravia KDL-40V2500 that will not power on

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  • PopsCaps
    Sir Shock-a-lot
    • Mar 2025
    • 5
    • USA

    #1

    Sony Bravia KDL-40V2500 that will not power on

    I have a Sony Bravia KDL-40V2500 that will not power on. The indicator flashes red 3 times.
    I do not hear any sound and I cannot see any backlight.
    I have tried disconnecting every cable on each board one at a time to see if anything changes.
    The only change is when I disconnect AC-DET cable on the Power Supply board or on the other end if I unplug the CN7009 connection on the B-Board and try to power on the TV the indicator will stay on solid green until I power off.
    My friend ordered another used power supply board but it is also doing the red indicator flash 3 times with that one.
    So either both power supply boards are bad or maybe there is a different problem.
  • PopsCaps
    Sir Shock-a-lot
    • Mar 2025
    • 5
    • USA

    #2
    testing voltage on AC-DET.
    With AC-DET cable connected 2.8 V
    with the AC-DET disconnected about 3.4 V

    on the connector to the right, I am not getting 18V on any of those pins. It only reads about 0.2 mV on each one

    Comment

    • PopsCaps
      Sir Shock-a-lot
      • Mar 2025
      • 5
      • USA

      #3
      testing voltage on the pins on this larger connector on the right hand side of the board I see only low voltage on every pin with the cable connected
      But I get 3.4 V on standby pin with the cable disconnected

      Comment

      • PopsCaps
        Sir Shock-a-lot
        • Mar 2025
        • 5
        • USA

        #4
        Could anyone please help me diagnose this issue?

        Comment

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