Sanyo FW55D25F will not turn on

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  • itronic
    Senior Member
    • Sep 2015
    • 82
    • usa
    #1

    Sanyo FW55D25F will not turn on

    This tv has will not turn on. I unplugged ribbon cable (c5n01) going to mainboard and still no backlights. I unplugged led connection (cn1401,cn1201,cn1101) and check with a backlight tester and each set came on. Im thinking PSU is bad.

    PSU Power test with mainboard unplugged and led plugged up.

    check from ground to each point on cn501 connection:

    1. 0
    2. 0
    3. 0
    4. 0
    5. 0
    6. 0
    7. 0
    8. 0
    9. 0
    10. 0
    11. 0
    12. 0
    13. 0
    14. 0
    15. 8v
    16. 8v
    17. 8v
    18. 8v
    19. 0
    20. 13v
    21. 13v
    22. 13v
    23. 13v

    Any help will be great. Thanks in advance.

    Here is the boards in my tv.

    https://www.shopjimmy.com/sanyo-fw55...w-970672831097

    Here is close up of another PSU that will work for a DS2 series tv with back of board picture to.

    https://www.shopjimmy.com/sanyo-a5gr...2-serial-only/
    Last edited by itronic; 11-25-2020, 10:38 AM.
    Tags: None
    • itronic
      Senior Member
      • Sep 2015
      • 82
      • usa
      #2
      Re: Sanyo FW55D25F will not turn on

      Okay, UPDATE:

      Tried another PSU, done same thing as last PSU did. Same readings and they both chirp. I can unhook mainboard and chirping stops. So ordering main board today.

      Also, anyone know how to make the PSU come on by itself.

      thanks in advance.
      Last edited by itronic; 12-05-2020, 11:49 AM.

        Comment

        • itronic
          Senior Member
          • Sep 2015
          • 82
          • usa
          #3
          Re: Sanyo FW55D25F will not turn on

          UPDATE:

          This model needs main board to make PSU come on.
          The main board was bad. So after installing , everything works great now.

            Comment

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