lg 32lv375s no backlight no picture

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  • nbdy
    Senior Member
    • Aug 2015
    • 162
    • Croatia

    #1

    lg 32lv375s no backlight no picture

    Hi

    I have checked the power board (no desoldering), and everything seems to be OK ...

    Anyone have a schematic of this board (EAX62865601/7) ?

    Or anyone knows how to solve it ?

    Btw. what pins do I have to short to power up the board (PWR-ON with 24 or GND) ?

    thx
  • Hamie
    Badcaps Legend
    • Apr 2014
    • 1383
    • UK

    #2
    Re: lg 32lv375s no backlight no picture

    Photos might help.

    Comment

    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain

      #3
      Re: lg 32lv375s no backlight no picture

      Photos and have you even checked the voltages labeled on the connector ?
      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

      • nbdy
        Senior Member
        • Aug 2015
        • 162
        • Croatia

        #4
        Re: lg 32lv375s no backlight no picture

        With what to connect the pwt-on

        Comment

        • nbdy
          Senior Member
          • Aug 2015
          • 162
          • Croatia

          #5
          Re: lg 32lv375s no backlight no picture

          Sorry,was on a bussines trip ...

          here are the pictures :

          http://s1.postimg.org/3jnllwoa7/20151205_125710_1.jpg

          http://s24.postimg.org/nojsueoad/20151205_125719_1.jpg

          http://s4.postimg.org/51cw75hal/20151205_125730_1.jpg

          http://s8.postimg.org/v41u9om45/20151205_125817_1.jpg

          This are all 4 boards on the TV

          Comment

          • nbdy
            Senior Member
            • Aug 2015
            • 162
            • Croatia

            #6
            Re: lg 32lv375s no backlight no picture

            Hello,was on a long work out of home ...

            Checked the voltages,have 3.5V,but 12V and 24V not

            btw. the board looks ok like on the pictures no brown fluid around caps

            thx
            Last edited by nbdy; 03-05-2016, 11:54 AM.

            Comment

            • nbdy
              Senior Member
              • Aug 2015
              • 162
              • Croatia

              #7
              Re: lg 32lv375s no backlight no picture

              Rechecked the K10A60D, all ok with esr tester

              anyone an idea ??

              Comment

              • CapLeaker
                Leaking Member
                • Dec 2014
                • 8061
                • Canada

                #8
                Re: lg 32lv375s no backlight no picture

                First we need to know the DC voltages measured on the connectors of the power supply bottom right. Check if the power supply is getting turned on by the main board (PSon pin). Measure the pins and post voltages with corresponding pin names.
                If you have PSon and BLon, but no high voltage on the main filter caps, you either have a short in the secondary or the PFC isn't working.
                To check if the PFC is working, measure the DC voltage directly at the main filter cap. It should be around handy 400V. Be careful!
                No boosted voltage, no 12 / 24V.
                To fire up the PSU, take a 1k ohm resistor and jump between STBY voltage and PSon. Same thing for BLon.
                Last edited by CapLeaker; 03-06-2016, 06:35 AM.

                Comment

                • nbdy
                  Senior Member
                  • Aug 2015
                  • 162
                  • Croatia

                  #9
                  Re: lg 32lv375s no backlight no picture

                  Sorry my work is on field outside my home,so can not reply over week ...

                  I mesure only the 3.5V on the white connector

                  the 24V is not present

                  PWR-ON is zero

                  BL-ON could not find on the board

                  where to measure on the main filter ???

                  thx

                  Comment

                  • dick_barton
                    Badcaps Legend
                    • Aug 2015
                    • 6642
                    • Wales

                    #10
                    Re: lg 32lv375s no backlight no picture

                    Can you supply a closeup picture of the blue and white connector and the text written alongside giving the pinouts.
                    Attached Files
                    Last edited by dick_barton; 03-12-2016, 07:45 AM.
                    Willing to help but I'm no expert.

                    Comment

                    • i_am_hacked
                      New Member
                      • Mar 2016
                      • 1
                      • Saudia Arab

                      #11
                      Re: lg 32lv375s no backlight no picture

                      Hi everyone friends i am new to here and i want to learn about schematics how to check on voltage and find the problem please help me i have experience in hardware but no experience on pdf schematic who to troubleshot Thanks for everyone ...

                      Comment

                      • nbdy
                        Senior Member
                        • Aug 2015
                        • 162
                        • Croatia

                        #12
                        Re: lg 32lv375s no backlight no picture

                        http://postimg.org/image/5g2fw39mh/

                        rechecked the block capacitors,all OK,but the gretz don't have any voltage on middle pins,and side pins

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales

                          #13
                          Re: lg 32lv375s no backlight no picture

                          Disconnect the white connector and check the power supply by connecting a 1K resistor from Power-On to 3.3V on the power supply white connector and check for 12V & 24V
                          Last edited by dick_barton; 03-12-2016, 09:25 AM.
                          Willing to help but I'm no expert.

                          Comment

                          • nbdy
                            Senior Member
                            • Aug 2015
                            • 162
                            • Croatia

                            #14
                            Re: lg 32lv375s no backlight no picture

                            With 1k resistor i have 12V and 24V on the pins and the 3.5V

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales

                              #15
                              Re: lg 32lv375s no backlight no picture

                              Remove the Power On pin carefully from the connector and plug the white connector back into the socket. Connect the loose wire to the 1K and connect to the 3.3V and check your backlights.
                              Willing to help but I'm no expert.

                              Comment

                              • nbdy
                                Senior Member
                                • Aug 2015
                                • 162
                                • Croatia

                                #16
                                Re: lg 32lv375s no backlight no picture

                                Still no backlight/no picture

                                the power led goes red,when i press ON the led flashes red and goes to orange

                                Could it be some other board,not the power supply
                                Last edited by nbdy; 03-12-2016, 10:44 AM.

                                Comment

                                • Diah
                                  Badcaps Legend
                                  • Feb 2013
                                  • 6355
                                  • Germany

                                  #17
                                  Re: lg 32lv375s no backlight no picture

                                  is this your TV chassis LD12B main board EAX63557704 ?

                                  if yes then its not power supply, its main board which cant repair, only replacement

                                  Comment

                                  • nbdy
                                    Senior Member
                                    • Aug 2015
                                    • 162
                                    • Croatia

                                    #18
                                    Re: lg 32lv375s no backlight no picture

                                    Yes it is

                                    thx for reply
                                    Last edited by nbdy; 03-12-2016, 11:37 AM.

                                    Comment

                                    • Diah
                                      Badcaps Legend
                                      • Feb 2013
                                      • 6355
                                      • Germany

                                      #19
                                      Re: lg 32lv375s no backlight no picture

                                      you can try also,this but not always work.

                                      take the black heat sink out, so you will have access to the DDR and processor , heat them with hotair gun on 350 degree for round 10 second.

                                      good luck
                                      Last edited by Diah; 03-12-2016, 11:47 AM.

                                      Comment

                                      • dick_barton
                                        Badcaps Legend
                                        • Aug 2015
                                        • 6642
                                        • Wales

                                        #20
                                        Re: lg 32lv375s no backlight no picture

                                        It does appear to be a main board problem as Diah indicates. I suppose you have nothing to lose to try and heat it as suggested.
                                        Willing to help but I'm no expert.

                                        Comment

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