37LH5000 Switches itself off

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  • Johnboy78
    Senior Member
    • Apr 2013
    • 60
    • Uk
    #1

    37LH5000 Switches itself off

    Hi guys, got a 37" LG 37LH5000 it has a fault where you turn it on and you get the channel install box up, but straight away the picture gets dimmer in 3 stages from normal brightness to black screen, it does this 3 times then switches off.....any ideas? it will switch on again but does the same thing.

    Have opened it up and looked at the caps on the power board but they all look fine....im puzzled, any help would be gratefull. Thanks
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: 37LH5000 Switches itself off

      Check the BLON and DIM signals from the main board. If you need more help, you will need to post pictures.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • Johnboy78
          Senior Member
          • Apr 2013
          • 60
          • Uk
          #3
          Re: 37LH5000 Switches itself off

          whats the process to check those tom?

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: 37LH5000 Switches itself off

              Pictures of the chassis and power supply and then we'll talk.
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Johnboy78
                  Senior Member
                  • Apr 2013
                  • 60
                  • Uk
                  #5
                  Re: 37LH5000 Switches itself off

                  just doing it now

                    Comment

                    • Johnboy78
                      Senior Member
                      • Apr 2013
                      • 60
                      • Uk
                      #6
                      Re: 37LH5000 Switches itself off

                      [IMG][/IMG]

                      [IMG][/IMG]

                      [IMG][/IMG]

                        Comment

                        • Johnboy78
                          Senior Member
                          • Apr 2013
                          • 60
                          • Uk
                          #7
                          Re: 37LH5000 Switches itself off

                            Comment

                            • Johnboy78
                              Senior Member
                              • Apr 2013
                              • 60
                              • Uk
                              #8
                              Re: 37LH5000 Switches itself off


                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK
                                  #9
                                  Re: 37LH5000 Switches itself off

                                  Can you get a closer shot of the top left connector in this photo, in particular the pin legend in black next to it.
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • Johnboy78
                                      Senior Member
                                      • Apr 2013
                                      • 60
                                      • Uk
                                      #10
                                      Re: 37LH5000 Switches itself off

                                      yep will do it now

                                        Comment

                                        • Johnboy78
                                          Senior Member
                                          • Apr 2013
                                          • 60
                                          • Uk
                                          #11
                                          Re: 37LH5000 Switches itself off

                                            Comment

                                            • tom66
                                              EVs Rule
                                              • Apr 2011
                                              • 32560
                                              • UK
                                              #12
                                              Re: 37LH5000 Switches itself off

                                              I can't really see those, any way you can get better focus?
                                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                Comment

                                                • Johnboy78
                                                  Senior Member
                                                  • Apr 2013
                                                  • 60
                                                  • Uk
                                                  #13
                                                  Re: 37LH5000 Switches itself off

                                                  i will try, my camera isnt the best lol, or i could write them down probably be better

                                                    Comment

                                                    • tom66
                                                      EVs Rule
                                                      • Apr 2011
                                                      • 32560
                                                      • UK
                                                      #14
                                                      Re: 37LH5000 Switches itself off

                                                      Writing them down would work too.
                                                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                        Comment

                                                        • Johnboy78
                                                          Senior Member
                                                          • Apr 2013
                                                          • 60
                                                          • Uk
                                                          #15
                                                          Re: 37LH5000 Switches itself off

                                                          best i can do!

                                                            Comment

                                                            • Johnboy78
                                                              Senior Member
                                                              • Apr 2013
                                                              • 60
                                                              • Uk
                                                              #16
                                                              Re: 37LH5000 Switches itself off

                                                              the top right is PWR-DTM, then underneath that is ERROR INV ON/OFF

                                                                Comment

                                                                • tom66
                                                                  EVs Rule
                                                                  • Apr 2011
                                                                  • 32560
                                                                  • UK
                                                                  #17
                                                                  Re: 37LH5000 Switches itself off

                                                                  OK, it looks like the 2nd down from top left pin is the backlight brightness control.

                                                                  You will need a digital multimeter.

                                                                  Set the multimeter to DC 20V. Red probe goes in VOLT jack. Black probe in COM jack. Place the black probe on some exposed part of the metal backing, e.g. the wall mount points. Then touch the red probe to the exposed metal around the connector. The connector to the main board must be installed.

                                                                  Record the reading when the TV is working, then as it begins to get dimmer and finally when it switches off.
                                                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                                    Comment

                                                                    • Johnboy78
                                                                      Senior Member
                                                                      • Apr 2013
                                                                      • 60
                                                                      • Uk
                                                                      #18
                                                                      Re: 37LH5000 Switches itself off

                                                                      hmm ok ill have to get a voltmeter from somewhere. Have u got any ideas what it might be?

                                                                        Comment

                                                                        • tom66
                                                                          EVs Rule
                                                                          • Apr 2011
                                                                          • 32560
                                                                          • UK
                                                                          #19
                                                                          Re: 37LH5000 Switches itself off

                                                                          If the BRI signal is not stable it is the main board, but if it is stable it is power board, inverter board or lamps. Likely inverter board or lamps in my opinion.
                                                                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                                            Comment

                                                                            • Johnboy78
                                                                              Senior Member
                                                                              • Apr 2013
                                                                              • 60
                                                                              • Uk
                                                                              #20
                                                                              Re: 37LH5000 Switches itself off

                                                                              ok is it possible to test the inverter board and power board too?

                                                                                Comment

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