Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

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  • alltvrepairs
    Badcaps Veteran
    • Jan 2014
    • 236
    • Malta
    #1

    Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

    Hi,

    I would like to reduce the backlights for this set. There is no direct settings like in Samsung or LG etc. Probably in Option Codes in SDM.
    If not available I would like to ask if anyone managed to alter the circuit to reduce slightly the LED current. Uses PF7904S U8601




    Tks
    Attached Files
    Last edited by alltvrepairs; 01-24-2023, 06:18 AM.
    Tags: None
    • alltvrepairs
      Badcaps Veteran
      • Jan 2014
      • 236
      • Malta
      #2
      Re: Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

      No one here ever tried to reduce backlight in modern Philips sets?

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12212
          • U.S.
          #3
          Re: Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

          here's tomtech doing a few, usually done with a resistor mod: https://www.youtube.com/results?sear...r+modification

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4704
              • Russia
              #4
              Re: Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

              Originally posted by alltvrepairs
              No one here ever tried to reduce backlight in modern Philips sets?
              These resistors are a current sensor, when one, two, ... are removed, the resistance in this circuit will increase, therefore, the current to the LEDs will decrease.
              Attached Files

                Comment

                • alltvrepairs
                  Badcaps Veteran
                  • Jan 2014
                  • 236
                  • Malta
                  #5
                  Re: Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

                  Originally posted by nomoresonys
                  here's tomtech doing a few, usually done with a resistor mod: https://www.youtube.com/results?sear...r+modification
                  Tks. Interesting guy for sure. Nice watching him removing Large screens bare handed without suckers!

                    Comment

                    • alltvrepairs
                      Badcaps Veteran
                      • Jan 2014
                      • 236
                      • Malta
                      #6
                      Re: Philips 55PUS6754/12 Backlight settings override TMP19.6E LA

                      Originally posted by lotas
                      These resistors are a current sensor, when one, two, ... are removed, the resistance in this circuit will increase, therefore, the current to the LEDs will decrease.
                      Tks, I was after those lines as well but preferred a confirmation first. Have tried with the 100R series resistor range 75R to120R made no difference. However I am sure removing a resistor from the voltage divider you marked should be a quicker option.
                      Tks again!

                        Comment

                        • kiko1
                          Member
                          • Apr 2016
                          • 48
                          • croatia
                          #7
                          I want to wake up this topic a bit.....
                          I tried removing resistors from FET-s source, but current did not changed...
                          tried also double the source resistance from Q8601....still the same current...go figure....
                          I really need PF7904S datasheet...anyone have it??

                            Comment

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