17IPS11 - No Backlight

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  • speedypro
    Badcaps Veteran
    • Feb 2013
    • 561
    • United Kingdom
    #1

    17IPS11 - No Backlight

    I'm aware of this post but I need to understand something before I dive into the panel to change any strips. I do not have the backlight (there is display with a torch shines onto the screen). On the attached image, red/black wires, I get no voltage. If plugged out and test, no voltage. Should there be x voltage regardless if connected or not?

    Attached Files
    Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer
    Tags: None
    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: 17IPS11 - No Backlight

      Yes, find the sch for IPS11 (inverter power supply) led drive area and test what you get vcc out the controller to the mosfet. Also check for short circuits on the led drive area output.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk
          #3
          Re: 17IPS11 - No Backlight

          The schematic is in the other thread but added to this one for easier access
          Attached Files

            Comment

            • speedypro
              Badcaps Veteran
              • Feb 2013
              • 561
              • United Kingdom
              #4
              Re: 17IPS11 - No Backlight

              Thanks.
              Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                Comment

                • ReeceyBurger123
                  Never Give Up !
                  • May 2014
                  • 7325
                  • Britain
                  #5
                  Re: 17IPS11 - No Backlight

                  Any luck ? Ive not had this issue on these Psus yet they are actually very very reliable in terms of Vestel.
                  Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                  https://www.facebook.com/Telford-Tel...7894576335359/

                    Comment

                    • speedypro
                      Badcaps Veteran
                      • Feb 2013
                      • 561
                      • United Kingdom
                      #6
                      Re: 17IPS11 - No Backlight

                      Originally posted by ReeceyBurger123
                      Any luck ? Ive not had this issue on these Psus yet they are actually very very reliable in terms of Vestel.
                      Yes. MP3394 needed replacing and also a led strip. TV is now working like new. Thanks.
                      Full-time computer repair tech (10am - 6pm) and full-time, (8am - 11pm), Ruby on Rails Developer

                        Comment

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain
                          #7
                          Re: 17IPS11 - No Backlight

                          Good job, usual suspects seems sometimes if an Led fails it can kill the driver Ic. Watch the lastest video on an Lg where there was a bad Led which also took the driver out as well.
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                            Comment

                            • Andrew F. Ali
                              Badcaps Legend
                              • Jan 2014
                              • 2450
                              • Trinidad & Tobago
                              #8
                              Re: 17IPS11 - No Backlight

                              Originally posted by ReeceyBurger123
                              Good job, usual suspects seems sometimes if an Led fails it can kill the driver Ic. Watch the lastest video on an Lg where there was a bad Led which also took the driver out as well.
                              Reecey, do you have the link to view this video???
                              Thanks.

                                Comment

                                • vinceroger69
                                  Badcaps Legend
                                  • Mar 2012
                                  • 6714
                                  • uk
                                  #9
                                  Re: 17IPS11 - No Backlight

                                  i think it maybe this one ive just watched
                                  https://www.youtube.com/watch?v=C567h02AqS0

                                    Comment

                                    • ReeceyBurger123
                                      Never Give Up !
                                      • May 2014
                                      • 7325
                                      • Britain
                                      #10
                                      Re: 17IPS11 - No Backlight

                                      That is it Vince filmed that ages ago just got round to uploading
                                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                      https://www.facebook.com/Telford-Tel...7894576335359/

                                        Comment

                                        • Andrew F. Ali
                                          Badcaps Legend
                                          • Jan 2014
                                          • 2450
                                          • Trinidad & Tobago
                                          #11
                                          Re: 17IPS11 - No Backlight

                                          Thanks vince and Reecey.

                                            Comment

                                            • JoeBug
                                              Member
                                              • Jul 2015
                                              • 20
                                              • Bulgaria
                                              #12
                                              Re: 17IPS11 - No Backlight

                                              i just got Toshiba with same board, one open LED in the backlight, all LEDs are in serices. When not connected(and when connected too, due open LED, voltage rise hight ( 50v on multimeter) then start droping to 0 (cap discharge).
                                              Seems planned to be so, as i can see on the Open LED Protection chart, page 5 on the datasheet.
                                              Fixed the open led, everything OK now. But my point was - when backlight disconnected, no voltage at the connector (rise hight, then stop and drop to 0)

                                                Comment

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