TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

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  • lepak06
    Senior Member
    • Feb 2017
    • 51
    • france
    #1

    TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

    Hello

    I have an TV Led 4K Selecline 65s18 with mainboard T.MS3458.U801

    The TV is faulty with stuck in Standby RED LED. Can't power the TV.

    Before this problem , the TV stuck the picture with artefact , i unplug the AC cable and since the tv is stuck in standby .

    All voltage are OK on PSU and main board for regulator. I tried flash firmware 25Q64 with many dumps

    But the voltage on power button is 0.6V not 3.3V. When i press power button the voltage up to 0V. I tried to add 5V with Power Supply on 5V_STB and 3.3V on Power Button . Same problem

    When i remove the the Flash Ic, the voltage on power button is 3.3V .

    The CPU is normaly heating



    I didn't understand this problem. Is the CPU faulty ?



    Here schematics and original dump. Do you have any ideas
    Attached Files
    Last edited by lepak06; 01-12-2023, 01:58 AM.
    Tags: None
    • lotas
      Badcaps Legend
      • Jan 2016
      • 4600
      • Russia
      #2
      Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

      Try and replace the spi flash with a new one.
      Attached Files
      Last edited by lotas; 01-12-2023, 05:05 AM.

        Comment

        • lepak06
          Senior Member
          • Feb 2017
          • 51
          • france
          #3
          Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

          I already tried to use an other spi flash ic
          Because the original GD25Q64 , i can't erase it with CH341a. I used an MX25L64 from an laptop motherboard

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4600
              • Russia
              #4
              Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

              Originally posted by lepak06
              I already tried to use an other spi flash ic
              Because the original GD25Q64 , i can't erase it with CH341a. I used an MX25L64 from an laptop motherboard
              This MX25L64 may not start your motherboard, you need to find the original GD25Q64 or Winbond W25Q64 (with DUAL/QUAD SPI & QPI support)
              And you can’t erase your own, since it’s more likely to be protected from erasure (status register).
              Last edited by lotas; 01-12-2023, 06:58 AM.

                Comment

                • lepak06
                  Senior Member
                  • Feb 2017
                  • 51
                  • france
                  #5
                  Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

                  Ok, GD25q64 i don't have but i'll try to find Winbond W25Q64

                  For the protection i tried use NeoProgrammer for unprotect but didn't work

                    Comment

                    • lepak06
                      Senior Member
                      • Feb 2017
                      • 51
                      • france
                      #6
                      Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

                      I succeeddd to unprotect write the GD25Q64. Now write and erase work

                      I tried you fix dump , and other dumps , All tries didn't work there is same problem.

                      When i remove Flash chip, there is 3.3V on keypad ( Power Button) . When the flash chip is solder on mainboard the voltage is 0.6V on keypad .

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4600
                          • Russia
                          #7
                          Re: TV LED 4K Selecline 65S18 ( T.MS3458.U801) stuck in Standby mode

                          What voltage (how many volts) do you have on 8 pin. with GD25Q64 installed and removed?

                            Comment

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