Philips 43PUS8550 no image, backlight working

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  • pseudorc
    Member
    • Sep 2024
    • 12
    • United Kingdom

    #1

    Philips 43PUS8550 no image, backlight working

    Hi,

    Checking voltages at TCON
    Vin 12 V ok BUT ALL OTHER VOLTAGES 0

    VGL1 0
    VDD
    vcc19
    VGH 0


    when connection to Left half screen cable disconnected - then other half becomes white and voltages shows down below
    VGH 27.96
    VCC19 1.89
    HVDD 8.31
    VGL1 5V
    VGL2 3.8

    TCON board has been replaced with similar (bought from Ebay)

    Is this LCD panel issue ? the parts showing parts no is lg 6870s-2704d


    Many thanksClick image for larger version

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    Attached Files
  • Diah
    Badcaps Legend
    • Feb 2013
    • 6346
    • Germany

    #2
    if you disconnect one ribbon between T-CON and panel.. then u have clear half white on screen.... it mean the MB didnt send full channel GPU signal.... with Philips we do downgrade the firmware with upgrade_loader-pkg firmware
    BTW be sure from yours TV model No !
    Last edited by Diah; 09-02-2024, 03:21 PM.

    Comment

    • pseudorc
      Member
      • Sep 2024
      • 12
      • United Kingdom

      #3
      Originally posted by Diah
      if you disconnect one ribbon between T-CON and panel.. then u have clear half white on screen.... it mean the MB didnt send full channel GPU signal.... with Philips we do downgrade the firmware with upgrade_loader-pkg firmware
      BTW be sure from yours TV model No !
      Hi, thanks for your response.
      Is it not supposed to happen on the other side as well ? I mean when disconnect other ribbon keeping the left one should it not replicate the white line?

      Is there any downgrade firmware how to process/instruction written up anywhere please ?

      Also the TV model no should be 8555 , not sure how to change it now
      Thanks

      Comment

      • Diah
        Badcaps Legend
        • Feb 2013
        • 6346
        • Germany

        #4
        Originally posted by pseudorc
        Also the TV model no should be 8555 , not sure how to change it now
        Thanks
        still wrong No...LOL

        Comment

        • pseudorc
          Member
          • Sep 2024
          • 12
          • United Kingdom

          #5
          Originally posted by Diah

          still wrong No...LOL
          How about PHILIPS 43PUS8555/12 43" Smart 4K Ultra HD HDR LED TV !

          Comment

          • Diah
            Badcaps Legend
            • Feb 2013
            • 6346
            • Germany

            #6
            Originally posted by pseudorc

            How about PHILIPS 43PUS8555/12 43" Smart 4K Ultra HD HDR LED TV !
            ok, its TPM191E 8505/8535/8545/8555 Performance Series

            which it share same FW with OLED.... from years 2020, you have here in this forum thread i posted of file eed you can flash it... or downgrade with upgrade loader-pkg android 11 or 9...
            usb stick need formatted FAT32 NBR mode... more info you finf´d on this link

            Comment

            • pseudorc
              Member
              • Sep 2024
              • 12
              • United Kingdom

              #7
              Originally posted by Diah

              ok, its TPM191E 8505/8535/8545/8555 Performance Series

              which it share same FW with OLED.... from years 2020, you have here in this forum thread i posted of file eed you can flash it... or downgrade with upgrade loader-pkg android 11 or 9...
              usb stick need formatted FAT32 NBR mode... more info you finf´d on this link
              Attempted downgrading , did not work , tried blindly though keeping the drive for at least 40 min

              Comment

              • Diah
                Badcaps Legend
                • Feb 2013
                • 6346
                • Germany

                #8
                some things wrong you did.... stick must in MBR mode formated FAT32,,,,, use the USB port on the side USB 2 black not blue..... at same link the side i gave it to you download another version upgrade_loader

                Comment

                • lotas
                  Badcaps Legend
                  • Jan 2016
                  • 4477
                  • Russia

                  #9
                  If you disconnect the cable from this half and voltage appears on the t-con, it means that this half is shorting out some voltage and the t-con goes into protection, take a high-quality photo of this entire strip.
                  Attached Files

                  Comment

                  • pseudorc
                    Member
                    • Sep 2024
                    • 12
                    • United Kingdom

                    #10
                    Originally posted by lotas
                    If you disconnect the cable from this half and voltage appears on the t-con, it means that this half is shorting out some voltage and the t-con goes into protection, take a high-quality photo of this entire strip.
                    Here are the pics
                    Attached Files

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4477
                      • Russia

                      #11
                      Disconnect the lvds cable and check the resistance at these points relative to ground (on the bar itself), it should not be low or short circuited, and also check the resistance at all ceramic capacitors on the entire bar.
                      Attached Files

                      Comment

                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6346
                        • Germany

                        #12
                        Originally posted by lotas
                        Disconnect the lvds cable and check the resistance at these points relative to ground (on the bar itself), it should not be low or short circuited, and also check the resistance at all ceramic capacitors on the entire bar.
                        MAN and you OP.. you have disconnected one ribbon and got half screen white but other half no image.... what are you both doing ? why playing with panel... its IPS panel who want to work on it nead to learn first how IPS working... and this why you disconnected other ribbon and no white screen display..... its funny... really funny going on here. good luck for destroying the set.,,, this is my last.

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4477
                          • Russia

                          #13
                          Originally posted by Diah

                          MAN and you OP.. you have disconnected one ribbon and got half screen white but other half no image.... what are you both doing ? why playing with panel... its IPS panel who want to work on it nead to learn first how IPS working... and this why you disconnected other ribbon and no white screen display..... its funny... really funny going on here. good luck for destroying the set.,,, this is my last.
                          Why are the output voltages on the T-con blocked when the non-working half is connected? Is this a software problem?

                          Comment

                          • Diah
                            Badcaps Legend
                            • Feb 2013
                            • 6346
                            • Germany

                            #14
                            Originally posted by lotas

                            Why are the output voltages on the T-con blocked when the non-working half is connected? Is this a software problem?
                            take look on the T-con main IC... and search after IPS how video channel delivered to gate transistor. , VIA tech are absolute different yours suspect will be in place.

                            Comment

                            • lotas
                              Badcaps Legend
                              • Jan 2016
                              • 4477
                              • Russia

                              #15

                              And here IPS or VIA, if the T-con blocks the voltage when connecting the faulty side.​

                              Comment

                              • Diah
                                Badcaps Legend
                                • Feb 2013
                                • 6346
                                • Germany

                                #16
                                Originally posted by lotas
                                And here IPS or VIA, if the T-con blocks the voltage when connecting the faulty side.
                                IPS depending on MB delivery... one channel or 2 channel signal , it will bw some design till 4 P1+--P4+ & p1- to p4- at the end all MB FW first then HW

                                Comment

                                • lotas
                                  Badcaps Legend
                                  • Jan 2016
                                  • 4477
                                  • Russia

                                  #17
                                  Originally posted by pseudorc
                                  Hi,

                                  Checking voltages at TCON
                                  Vin 12 V ok BUT ALL OTHER VOLTAGES 0

                                  VGL1 0
                                  VDD
                                  vcc19
                                  VGH 0


                                  when connection to Left half screen cable disconnected - then other half becomes white and voltages shows down below
                                  VGH 27.96
                                  VCC19 1.89
                                  HVDD 8.31
                                  VGL1 5V
                                  VGL2 3.8

                                  TCON board has been replaced with similar (bought from Ebay)

                                  Is this LCD panel issue ? the parts showing parts no is lg 6870s-2704d

                                  Voltages should not disappear (VGH, VGL,...) if the panel is working properly!

                                  Comment

                                  • Diah
                                    Badcaps Legend
                                    • Feb 2013
                                    • 6346
                                    • Germany

                                    #18
                                    man VGH or VGL will not present if no signal... its not fix V.. its range of Hz freq, and current which T-CON assign them to cell gate - one channel fault at PS or MB HW cause this in case you did used replacement T-CON at IPS account

                                    Comment

                                    • lotas
                                      Badcaps Legend
                                      • Jan 2016
                                      • 4477
                                      • Russia

                                      #19
                                      This is the first time I've heard this, did you come up with it yourself?
                                      So there is no signal, but when the non-working half of the voltage is turned off, for some reason the voltage is restored.
                                      What do you advise everyone then? To put the panel into offline mode, you just need to disconnect the LVDS cable and apply 12 V to the T-con fuse and the panel will alternate colors, so where do the voltages come from (VGH, VHL...) if there is no signal.
                                      Last edited by lotas; 09-04-2024, 05:19 PM.

                                      Comment

                                      • pseudorc
                                        Member
                                        • Sep 2024
                                        • 12
                                        • United Kingdom

                                        #20
                                        Originally posted by lotas
                                        Disconnect the lvds cable and check the resistance at these points relative to ground (on the bar itself), it should not be low or short circuited, and also check the resistance at all ceramic capacitors on the entire bar.
                                        Caps looks fine, however R2015 seems shorted whereas others are showing 299 Ω , and not getting any reading from D24 except the top middle one 30 Ω.
                                        Attached Files

                                        Comment

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