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Sanyo fw65d25t no picture; good sound

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    #81
    Re: Sanyo fw65d25t no picture; good sound

    Nomoresonys... Nice video and explanations of the power supply, main and T-con modules. I might be able to troubleshoot the missing n3.3v on the main board. Probably a bad regulator. Thanks for sharing. Still looking for a replacement main board.
    Don

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      #82
      Re: Sanyo fw65d25t no picture; good sound

      I finally found a main board and installed it. It WORK!! But now sometimes on power cycling sometimes it comes up with pictures and sometimes not... only a backlight. I scoped the main board and found signals going to the frc module inputs but no outputs to the T-Con. The regulator on Frc shows normal voltages of (top to bottom)
      .6v
      1.8v
      3.3
      I finally found the service manual of 33 pages which is really a degrace. No schematics. Poor troubleshooting tips. No real help at all. I replaced the frc but same issue. What turns on the frc outputs?
      Last edited by dcsharpsr; 03-05-2022, 08:28 PM.

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        #83
        Re: Sanyo fw65d25t no picture; good sound

        Oh... and that strange blinking windowed message is now gone. It must have been the eprom on the other board

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          #84
          Re: Sanyo fw65d25t no picture; good sound

          Maybe it's a problem on the frc board, since the signal comes in but doesn't make it out.

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            #85
            Re: Sanyo fw65d25t no picture; good sound

            I'm thinking the same but I changed it out with with the same issue. Since I'm now thinking the main board must turn on the function of the frc. Heck... I don't know why it's intermittent.
            I did have a problem with the key switches with a broken wire so it was disconnected when it I had pictures. After resoldering the wire back on and pluging back into the main board, it stopped showing pictures. I found the 3 3v from the main board dissappeared so I unplugged the key connector but still no pictures now. The 3.3v on the main board came back.

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              #86
              Re: Sanyo fw65d25t no picture; good sound

              not sure what all was tried, did you try unplugging the button board, speakers and wifi module? just to make sure none of them are causing the problem.

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