Philips 47PFL4606 Powers on, works normal then powers off after a minute

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  • simwalsh
    New Member
    • Dec 2023
    • 4
    • Ireland
    #1

    Philips 47PFL4606 Powers on, works normal then powers off after a minute

    Hi,
    I am new to this forum and have searched for some answers with problems similar to mine.
    Philips TV powers on as normal for about a minute or less then click and no power at all not even standby light. If i disconnect from mains and reconnect it will power on again but for a shorter time. Once i leave it disconnected from main for a longer time it will power on for a longer period the next time.

    It sounds like a power supply issue?

    I have the board out and want to run some tests. Not sure what i should be doing but i put a 1k resistor across SB and +5v and tested 12v and 24v. Both 24V and 12V slowly go down while i'm reading them,12V never gets to 12V and quickly goes down. blue LED901 stays on for a few seconds and then dies.

    Any tips on what could be wrong or what to try next?

    Many thanks.
    Last edited by simwalsh; 12-04-2023, 04:35 AM.
    Tags: None
    • simwalsh
      New Member
      • Dec 2023
      • 4
      • Ireland
      #2
      Update: did some further tests

      When turn power supply on with 1k resistor SB/+5V, across C907 i get over 327v dc then 400v then 327v after 3 seconds or so and when blue led goes off.

      At IC902 VCC pin 8 is 9.62V, across C946 i get 9.6V

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        • simwalsh
          New Member
          • Dec 2023
          • 4
          • Ireland
          #3
          ok thanks for the help here. /s

          For anyone that sees this message i fixed it by replacing IC905.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12123
              • U.S.
              #4
              I would have helped but didn't see the post, might have helped to bump it every so often. Oh well, the last time I figured something out without any help I felt better than if it would have been spoon fed to me, anyway, good work.

                Comment

                • simwalsh
                  New Member
                  • Dec 2023
                  • 4
                  • Ireland
                  #5
                  Originally posted by nomoresonys
                  I would have helped but didn't see the post, might have helped to bump it every so often. Oh well, the last time I figured something out without any help I felt better than if it would have been spoon fed to me, anyway, good work.
                  no worries. i got the answer from someone with the same problem on another forum just took a little bit of digging, i wouldn't be able for advanced electronics

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