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

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    #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
    #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.

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      #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

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

        Originally posted by lepak06 View Post
        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.

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          #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

            #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

              #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?

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