Sanyo fw65d25t no picture; good sound

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  • dcsharpsr
    Member
    • Nov 2013
    • 28
    • United States
    #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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      • dcsharpsr
        Member
        • Nov 2013
        • 28
        • United States
        #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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          • dcsharpsr
            Member
            • Nov 2013
            • 28
            • United States
            #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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              • nomoresonys
                Badcaps Legend
                • Jan 2013
                • 12269
                • U.S.
                #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.

                  Comment

                  • dcsharpsr
                    Member
                    • Nov 2013
                    • 28
                    • United States
                    #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.

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12269
                        • U.S.
                        #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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