Sharp lc-52e77un Blinking light

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  • Ricerider
    New Member
    • Oct 2012
    • 2
    • USA

    #1

    Sharp lc-52e77un Blinking light

    Hi all new here, have a shap aquos Model # lc-52e77un
    when plugged in the green power led comes on and i get a relay click but no picture or sound, ~10secs later i get a another click and this repeats multiple times before settling at power and opc led blink once together, then power led blinks twice and repeat. No picture or sound

    Opened back of tv and found top inveter not seated properly, pushed inverter back into place. Powered up no change. Also tried holding input and volume down when plugging in, no change. Would like help testing ouput voltage of power supply or whatever needs to be done. I have a multimeter, solder gun and smd rework station.

    Any help greatly appreciated, this is a 52" so its hard to just scrap it
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Sharp lc-52e77un Blinking light

    Count the blinks on the power LED and OPC LED.

    For example 5 blinks power, 2 blinks OPC, or 5-2. That is backlight failure from memory. (Don't quote me.) The service manual will tell you what the code means.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • Ricerider
      New Member
      • Oct 2012
      • 2
      • USA

      #3
      Re: Sharp lc-52e77un Blinking light

      power and opc led blink once together, then power led blinks twice. Repeats same blink code over and over.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Sharp lc-52e77un Blinking light

        OK 3-1 blink code then

        Service manual is here: http://www.tgohome.com/ServiceManual...&Search=Submit

        The first manual is the document for the LC-52SB57. The second contains the changes between that and LC-52E77.

        Error codes are on 6-15.

        3-1 error: "Initial communication from the main CPU is not received. (Request for the monitor model No. is not received after canceling the reset.) → Communication line error or main CPU start-up failure."
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • jkomorek
          Member
          • Jan 2013
          • 37
          • United States

          #5
          Re: Sharp lc-52e77un Blinking light

          I am looking at a TV with the same 'blink code'. Did you ever get resolution to this, and would you mind sharing?

          Comment

          • rawan
            Senior Member
            • Oct 2009
            • 57

            #6
            Re: Sharp lc-52e77un Blinking light

            Hi
            Any luck with this tv?? I have same problem, same model.
            LED Blinks 3-1 times.
            Any help please.
            Mac

            Comment

            • Sevenqi
              Badcaps Veteran
              • Jul 2011
              • 292

              #7
              Re: Sharp lc-52e77un Blinking light

              Hi any one know the solution for this 3-1 error code for Sharp ? is it the mother board problem ?

              Comment

              • cashkennedy
                Badcaps Veteran
                • Aug 2011
                • 666
                • USA

                #8
                Re: Sharp lc-52e77un Blinking light

                Id assume "main cpu" means the processor on the main board. So after confirming that all the voltages are reaching the mainboard appropriately (whether that be 3.3v, 5v, 12v, so on) then I would say to replace the main board.
                Fixed so far 12 lcd's , 1 plasmas, 5 monitors, 0 dlp's (plan to keep the dlps at 0). and 3 atx power supplies, and 2 motherboards.

                Comment

                • Sevenqi
                  Badcaps Veteran
                  • Jul 2011
                  • 292

                  #9
                  Re: Sharp lc-52e77un Blinking light

                  I had the same error code with the same model, after replaced the main board, tv works perfect.

                  Comment

                  • mbates14
                    Senior Member
                    • May 2005
                    • 169

                    #10
                    Re: Sharp lc-52e77un Blinking light

                    This seems to be a very common problem, and is happening in droves lately. over various different models.

                    I am starting to wonder if the main CPU's SPI flash memory isnt getting corrupt, and therefore it cant boot.

                    Comment

                    • icestation
                      New Member
                      • Nov 2023
                      • 2
                      • Canada

                      #11
                      Originally posted by mbates14
                      Re: Sharp lc-52e77un Blinking light

                      This seems to be a very common problem, and is happening in droves lately. over various different models.

                      I am starting to wonder if the main CPU's SPI flash memory isnt getting corrupt, and therefore it cant boot.
                      Nope, the FLASH is just fine:
                      I moved the FLASH, the 64K EEPROM, and the 2K EEPROM (contains the monitor size) over to another main board and that main board booted properly. (Original main board was DKEYMF953FM05 new main board was DKEYMF953FM06, so yes, the Monitor CPU ROM OTP contents were not identical, but new Monitor CPU still worked with the previous 2k EEPROM) Target TV: LC-80LE844U, now working.

                      Comment

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