Emerson LF501em4f wierd problem

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  • craigc15
    Senior Member
    • Jun 2012
    • 53
    • USA
    #1

    Emerson LF501em4f wierd problem

    I have an Emerson LF501em4f that I determined had a bad main board. Power supply seems to be working fine. I purchased a new board on eBay, installed it and plugged the TV in. TV came on everything looked good accept the video ribbon cable was apparently not inserted properly, so I turned off the TV by hitting the power button. I re-seated the video ribbon cable and then turned the TV back on and nothing! Back to where I was before the replacement main board: constantly blinking red led (~ once/second).
    Re-checked power supply voltages still look good.

    Any help would be GREATLY appreciated!
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 7972
      • Canada
      #2
      Re: Emerson LF501em4f wierd problem

      Any strait shot pictures?

        Comment

        • craigc15
          Senior Member
          • Jun 2012
          • 53
          • USA
          #3
          Re: Emerson LF501em4f wierd problem

          Are these the pics you're looking for?

          Thanks!
          Attached Files

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 7972
              • Canada
              #4
              Re: Emerson LF501em4f wierd problem

              Ugh... one of those... I hate these types of TV's. They use these ribbon cables between the PSU and the main board and probably the pin outs aren't marked. That makes it harder to troubleshoot.

              Try disconnecting the Tcon board from the main board and see what happens. The Tcon board is under the metal shield.

              That ribbon cable between the PSU and the main board, see if you can find a pin out marked on the boards.

                Comment

                • craigc15
                  Senior Member
                  • Jun 2012
                  • 53
                  • USA
                  #5
                  Re: Emerson LF501em4f wierd problem

                  Well, finally got back to this beast.
                  Yep, no markings on either board. I did find 12VDC, 21VDC and 3.3VDC on the PS board end of the ribbon cable.
                  I also unplugged the TCON connector and that didn't change anything.
                  I'm having a hard time trying to figure out what failed on the main board after turning it off and then on again. That is very odd to me.
                  I checked the output on the regulators on the main board and those voltages seem fine, too.

                    Comment

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