Emerson LF501EM5F won't turn on/stays on standby

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  • cotstem
    New Member
    • Nov 2018
    • 6
    • USA

    #1

    Emerson LF501EM5F won't turn on/stays on standby

    Hi all!

    I'm new to the forum and I have a TV that is giving me trouble. As the title suggests, I have an Emerson LF501EM5F that I can't seem to turn on but the standby LED is lit when plugged in. I have searched Google and other posts on this forum but to no avail.

    I did some basic troubleshooting, however I admit I have limited knowledge: I examined both the power board and main board for any abnormalities such as blown caps or burn marks but both boards are in really good shape.

    I don't even know if this is useful but I used the diode setting on my multimeter to try and make sure that the power button was sending a signal to the main board just to try and see if I could eliminate the possibility that it could be the button board or the IR board. If I did it correctly it tested fine. Unfortunately at the time of this writing I do not have a remote for the TV.

    I checked the main fuse on the power board with my diode meter and if I did it correctly it is making a proper circuit.

    I know that there are other posts on this forum about this product but none of them have the exact problem I am having. I did however try to follow along with some of the troubleshooting but I got a little lost because of the technicality of some of it.

    I've seen you guys help out a lot of people on this forum, and I greatly appreciate your help!
  • neilc6
    Badcaps Legend
    • Nov 2015
    • 1550
    • Canada

    #2
    Re: Emerson LF501EM5F won't turn on/stays on standby

    Searching the model number finds lots of repair kits and repair services in ebay.

    I would suspect the eeprom.. Blsst it with a can of upside down duster to freeze it and then plug it in. If it turns on, its the eeprom. If it doesn't, it still may be the eeprom.

    https://ebay.us/e1PABn

    Comment

    • cotstem
      New Member
      • Nov 2018
      • 6
      • USA

      #3
      Re: Emerson LF501EM5F won't turn on/stays on standby

      I tried it but I only had enough duster for one run. I'll get some more tomorrow and try again. Thanks.
      Last edited by cotstem; 11-17-2018, 12:48 AM.

      Comment

      • cotstem
        New Member
        • Nov 2018
        • 6
        • USA

        #4
        Re: Emerson LF501EM5F won't turn on/stays on standby

        Originally posted by neilc6
        Searching the model number finds lots of repair kits and repair services in ebay.

        I would suspect the eeprom.. Blsst it with a can of upside down duster to freeze it and then plug it in. If it turns on, its the eeprom. If it doesn't, it still may be the eeprom.

        https://ebay.us/e1PABn
        I tried your test and nothing happened, what makes you think it is the EEPROM?

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8119
          • Canada

          #5
          Re: Emerson LF501EM5F won't turn on/stays on standby

          Could be the EEPROM indeed. These are 15$ at SJ, or a new main board. You could freeze the EEPROM with a can of air upside down, then try to turn on the TV. If it turns on, you know what the problem is. I have a 70% success rate using this trick.

          Comment

          • neilc6
            Badcaps Legend
            • Nov 2015
            • 1550
            • Canada

            #6
            Re: Emerson LF501EM5F won't turn on/stays on standby

            If you have standby voltage and your other voltages are good, then the main board is suspect since it needs to send a pwr_on signal from the main processor. If you can find preprogrammed eeproms for your model, then the eeprom is suspect and should be cheaper than replacing a main board.

            I've successfully replaced eeproms on 3 tvs that use that same processor and had standby led and didn't turn on (Element, Emerson, & Haier). Only one turned on with freezing.
            Last edited by neilc6; 11-17-2018, 06:59 PM.

            Comment

            • cotstem
              New Member
              • Nov 2018
              • 6
              • USA

              #7
              Re: Emerson LF501EM5F won't turn on/stays on standby

              Thank you guys, I will try that.

              Comment

              • cotstem
                New Member
                • Nov 2018
                • 6
                • USA

                #8
                Re: Emerson LF501EM5F won't turn on/stays on standby

                I ended up using a repair service on eBay. I just didn’t trust my own soldering skills. With shipping, the cost was about $65 and it took less than a week.

                Comment

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