SONY KDL-55W905A 4 Blinking Red light

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  • asher_pa
    New Member
    • Jan 2020
    • 3
    • Israel
    #1

    SONY KDL-55W905A 4 Blinking Red light

    My SONY TV (KDL-55W905A) started with '4 Blinking Red light' problem, my TV DO show picture for 3 Sec and turning screen off and start blinking - all factory reset technics did not help.

    google it and found the problem can be the PSU.

    my PSU model is 1-888-119-11 , APS-344 , APS-344(CH)



    As I can see I have 2 option:
    1. I OD HAVE multimeter but unfortunately not much knowledge how to use it (but DO have good soldering skills) maybe some can point me from his personal experience which part need to be replaced?

    2. buy new PSU - does someone know good reliable and cheap online store that selling this part and offer international shipping?

    Can Someone please advise?

    TNX
    Tags: None
    • alfatv
      Badcaps Veteran
      • Sep 2020
      • 353
      • Canada
      #2
      Re: SONY KDL-55W905A 4 Blinking Red light

      1. Get service manual and study it. It's available online
      2. What does your google search say? Maybe? For sure? Describes what exactly is broken and how to fix it?
      3. Statistically lots of problems these days are backlight related

        Comment

        • tesla2020
          Member
          • Apr 2021
          • 14
          • Argentina
          #3
          Re: SONY KDL-55W905A 4 Blinking Red light

          bueno por lo que decís la fuente te debería estar mandando la tensión de stanby para que encienda el tv,
          Primero te diría que agarres el multímetro y lo pongas en la medición de tensión esta señalado por una V- y una raya recta (-) que tiene por debajo tres puntos no puedo poner los tres puntos debajo del guion seguido por eso solo pongo el guion espero que lo entiendas.
          Segundo una ves te encuentres con el sector que se encierra por el símbolo (V-) el multímetro estará en medición de Voltaje continuo con esto deberías poner la punta negra a masa y la roja en los pines de salida de voltaje de la fuente. Los voltajes generalmente vienen marcados en la placa deberías fijarte que lo valores leídos por tu multímetro sean casi iguales a los marcados en la placa que no tengan una diferencia de 4 Volts.
          Tercero si todos los voltajes están Bien tendrás que revisar la placa madre comenta como fue que le sucedió esto a tu TV y los valores de tensión leídos de tu Fuente

            Comment

            • tesla2020
              Member
              • Apr 2021
              • 14
              • Argentina
              #4
              Re: SONY KDL-55W905A 4 Blinking Red light

              me olvide de decirte que la escala en la que tiene estar tu multímetro es en el rango de los 20V es muy importante ya que si pones una escala menor por ejemplo 2V y mides una tensión de 12V puedes dañar tu multímetro

                Comment

                • sivasli
                  New Member
                  • Apr 2020
                  • 2
                  • Türkiye
                  #5
                  Re: SONY KDL-55W905A 4 Blinking Red light

                  It is tested by isolating 1 to 8 pins with tape on the flex cable between the led driver and us. If the 4 lights do not fail and there are shadow areas on the screen, the leds must be replaced.
                  Attached Files

                    Comment

                    • sivasli
                      New Member
                      • Apr 2020
                      • 2
                      • Türkiye
                      #6
                      Re: SONY KDL-55W905A 4 Blinking Red light

                      Originally posted by sivasli
                      It is tested by isolating 1 to 8 pins with tape on the flex cable between the led driver and us. If the 4 lights do not fail and there are shadow areas on the screen, the leds must be replaced.
                      https://www.youtube.com/c/AhmetErolUsta

                        Comment

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