lg55ub850v

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  • newtothis
    Badcaps Legend
    • Mar 2013
    • 1556
    • england
    #1

    lg55ub850v

    lg55ub850v

    Few posts on this one with no fix.

    Usual symptoms of solid led on main with 5 blink led on psu.

    Found bad mosfet for 12v tcon .. only .8v out

    Replaced and have led for tcon on main and 12v hitting tcon.

    Still no back-light.

    So have both leds on main lit. All voltages present from PSU. Still getting 5 flashes on PSU and no power to drv_on.
    Last edited by newtothis; 01-24-2024, 03:58 AM.
    Tags: None
    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12145
      • U.S.
      #2
      It's most likely the mainboard. probably same old bad bga solder connections.

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6363
          • Germany
          #3
          Originally posted by newtothis
          So have both leds on main lit. All voltages present from PSU. Still getting 5 flashes on PSU and no power to drv_on.
          it sound issue at LED BL

            Comment

            • newtothis
              Badcaps Legend
              • Mar 2013
              • 1556
              • england
              #4
              BL are fine. Forced on by injecting 3.5 to pwron and drv. No flash from BL either... main never sends signal to drv.

              No BGA issues... all packages removed and reballed.

              Replaced ic100 and ic101 just in case.

              No change

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12145
                  • U.S.
                  #5
                  Maybe trace drv on back through mainboard and see what it hits before the bga and check those components.
                  Last edited by nomoresonys; 01-25-2024, 11:00 AM.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12145
                      • U.S.
                      #6
                      Post a good focused picture of mainboard and one of the whole back.

                        Comment

                        • Diah
                          Badcaps Legend
                          • Feb 2013
                          • 6363
                          • Germany
                          #7
                          Originally posted by newtothis
                          BL are fine. Forced on by injecting 3.5 to pwron and drv. No flash from BL either... main never sends signal to drv.

                          No BGA issues... all packages removed and reballed.

                          Replaced ic100 and ic101 just in case.

                          No change
                          ohhh big work...
                          then what about if you simulate by slide out the wire of DRV_ON from PSU socket and jumper the pin as you did before to PWOR_ON... and turn on what will you have on the screen???

                            Comment

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