Samsung LN40B650 Standby light on, won't turn on

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  • Tiezane
    Senior Member
    • Aug 2013
    • 98
    • USA
    #41
    Re: Samsung LN40B650 Standby light on, won't turn on

    Originally posted by phil@philporter.com
    Never mind - I didn't read far enough. Looks like you did replace the main board and fixed it. Thanks.
    Good to see another North Carolina resident here Yeah, the mainboard fixed it, in fact, I've been using the TV as my main TV since replacing that board, without even a hiccup. I finally sold the broken DLP, and will be putting up a new 65" LED in a week or so and finally moving this TV up to the bedroom.

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      • sansonet
        Badcaps Veteran
        • Nov 2013
        • 236
        • US
        #42
        Re: Samsung LN40B650 Standby light on, won't turn on

        Originally posted by martino
        On my samsung(different model tho) I couldn't find the eeprom either.
        Had to remove the mainboard and on the backside of the board I found these "test points"..I soldered wires on them so that I could connect them with mainboard installed in tv...
        I have LN46C670M1FXZA, the symptoms are the same as in original post. I found this tread and was trying to fix it. I also can't find eeprom but found those test points. Not sure if I jumpered correct ones, I took advice from here http://wiki.samygo.tv/index.php5/UnB...EPROM_Location
        Connected SDA and 3.3V, but that didn't help. Should connect it differently?
        Also, I was looking for replacement board on ebay. This board has 3 numbers on it, one printed on the board, and two on stickers. Only one board on ebay that matches all 3 is very expensive - $150, but I could find board for $50-60 if it matches only printed number on board, but stickers numbers are not the same. They also coming from different size of TVs - 55" and 40". I will post pics of one I saw on ebay and one from my TV - they look identical. Is it OK to buy that one? First one from the left - board from ebay, second one - from my TV. Sellers says it came from LN55C630K1FXZA.
        Attached Files

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          • Jimmy60
            Member
            • Jul 2014
            • 17
            • USA
            #43
            Re: Samsung LN40B650 Standby light on, won't turn on

            I realize this is an old post but I have a LN40B650T that seems to power up fine until the backlights start to reach full voltage, then just shuts down. Does that indicate a bad backlight? How can I tell which one?
            Thanks
            Jim

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              • Jimmy60
                Member
                • Jul 2014
                • 17
                • USA
                #44
                Re: Samsung LN40B650 Standby light on, won't turn on

                It tries to power up as soon as I plug it in but the standby light comes on if I power down after it fails. It tries to power up through the same sequence every time I hit the power button on the set or the remote.

                Thanks
                Jim
                Last edited by Jimmy60; 04-19-2017, 12:21 PM. Reason: already posted

                  Comment

                  • dick_barton
                    Badcaps Legend
                    • Aug 2015
                    • 6642
                    • Wales
                    #45
                    Re: Samsung LN40B650 Standby light on, won't turn on

                    Does it power up when you disconnect the backlights?
                    Willing to help but I'm no expert.

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