Bush s642f dead no standby light

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  • Rickig
    Senior Member
    • Mar 2015
    • 112
    • England
    #1

    Bush s642f dead no standby light

    Hi guys
    I have the above set that when plugged in I can hear the psu hum but get no standby light.
    The 5v standby voltage is down to 1.5v.
    0.8v to the on/off pin
    No other voltages.
    Replaced all the domed caps on psu & still same.
    Suggestions?
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8146
      • Canada
      #2
      Re: Bush s642f dead no standby light

      unplug the main board and measure the STBY voltage again on the PSU.

        Comment

        • Rickig
          Senior Member
          • Mar 2015
          • 112
          • England
          #3
          Re: Bush s642f dead no standby light

          Same

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Bush s642f dead no standby light

              Time for good clear pictures of the whole back side of the TV so we can see all the boards and then good clear pictures of the top and bottom side of the power supply board to start with.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • Ukdigger
                  Senior Member
                  • May 2020
                  • 121
                  • England
                  #5
                  I've just fixed a Bush S642F - PSU - JSK4260-050A - REV:1.3. The standby light was flashing red, on and off repeatedly and the standby voltage was jumping between 1.5 and 3.5 volts. I changed the 3 caps behind the connector block, (I think it was PL807) and then got a steady 5v reading and a solid red standby light. The TV powered up ok with a blue power light, but it wouldn't get a signal to tune in the TV stations. It worked fine with a Youview box through the HDMI so I sold it to someone who just wanted it for his PlayStation.
                  Last edited by Ukdigger; 12-02-2023, 09:00 AM.

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