LG 50PQ6000 unstable 5v standby

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  • Baileybum1234
    Badcaps Veteran
    • Sep 2012
    • 245
    • UK

    #181
    Re: LG 50PQ6000 unstable 5v standby

    Looked at my only old PC PSU and there isnt one.

    Found this online though?

    Simple-Set your analog meter to X 10 K ohm range. Black probe to pin1 and red probe to pin 2 and 3 (must have readings) then black probe to pin 2 and red probe to pin 1 and 3 (must have readings). If black probe to pin 3 and red probe to pin 1 and 2-it should have no reading. If there is a reading then it is consider shorted. How acurate is this test? It is 90 over percent. That means, if you still suspicious about the reading then the only way is to direct replace the component and retest the smps again. This component is quite cheap and easily get from those used electronic board especially the SMPS that have the optoisolator in it.

    Credit to jestineyoung.com
    Repaired: LG50PQ6000

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #182
      Re: LG 50PQ6000 unstable 5v standby

      Not useful.
      Only tests for leaky/short not failing reference.
      Why don't you follow this thread - I'm helping heavymachines out with possible same issue:
      https://www.badcaps.net/forum/showth...=24304&page=10
      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

      • Baileybum1234
        Badcaps Veteran
        • Sep 2012
        • 245
        • UK

        #183
        Re: LG 50PQ6000 unstable 5v standby

        Originally posted by Baileybum1234
        Looked at my only old PC PSU and there isnt one.

        Found this online though?

        Simple-Set your analog meter to X 10 K ohm range. Black probe to pin1 and red probe to pin 2 and 3 (must have readings) then black probe to pin 2 and red probe to pin 1 and 3 (must have readings). If black probe to pin 3 and red probe to pin 1 and 2-it should have no reading. If there is a reading then it is consider shorted. How acurate is this test? It is 90 over percent. That means, if you still suspicious about the reading then the only way is to direct replace the component and retest the smps again. This component is quite cheap and easily get from those used electronic board especially the SMPS that have the optoisolator in it.

        Credit to jestineyoung.com
        Agreed didnt help me at all.
        Repaired: LG50PQ6000

        Comment

        • Baileybum1234
          Badcaps Veteran
          • Sep 2012
          • 245
          • UK

          #184
          Re: LG 50PQ6000 unstable 5v standby

          Originally posted by tom66
          Not useful.
          Only tests for leaky/short not failing reference.
          Why don't you follow this thread - I'm helping heavymachines out with possible same issue:
          https://www.badcaps.net/forum/showth...=24304&page=10
          Cool will do thanks
          Repaired: LG50PQ6000

          Comment

          • Baileybum1234
            Badcaps Veteran
            • Sep 2012
            • 245
            • UK

            #185
            Re: LG 50PQ6000 unstable 5v standby

            Originally posted by Baileybum1234
            Cool will do thanks
            The link brought me back to this thread!
            Repaired: LG50PQ6000

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #186
              Re: LG 50PQ6000 unstable 5v standby

              I mean here
              https://www.badcaps.net/forum/showth...t=25670&page=4
              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

              • Baileybum1234
                Badcaps Veteran
                • Sep 2012
                • 245
                • UK

                #187
                Re: LG 50PQ6000 unstable 5v standby

                Cooleo! Cheers
                Repaired: LG50PQ6000

                Comment

                • Baileybum1234
                  Badcaps Veteran
                  • Sep 2012
                  • 245
                  • UK

                  #188
                  Re: LG 50PQ6000 unstable 5v standby

                  I think I will get some in stock they seam a useful part to have in the draw.

                  Could you please tell me if the KIA431A is the same as the TL431A?

                  Data sheets below:





                  Ebay has some TL431A's easy to obtain thats all.

                  I have had a look and a few of the important looking numbers look close but not exact.
                  Repaired: LG50PQ6000

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #189
                    Re: LG 50PQ6000 unstable 5v standby

                    They appear to be compatible.
                    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

                    • Baileybum1234
                      Badcaps Veteran
                      • Sep 2012
                      • 245
                      • UK

                      #190
                      Re: LG 50PQ6000 unstable 5v standby

                      Thanks Tom
                      Repaired: LG50PQ6000

                      Comment

                      • Baileybum1234
                        Badcaps Veteran
                        • Sep 2012
                        • 245
                        • UK

                        #191
                        Re: LG 50PQ6000 unstable 5v standby

                        I replaced 4 x TL431 but still a low stand by voltage.

                        I was lookng at this resistor and it was sutch a low resistance I couldnt check it??

                        Ps. have circuled a few bits.
                        Attached Files
                        Repaired: LG50PQ6000

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #192
                          Re: LG 50PQ6000 unstable 5v standby

                          Whats with that diode looks brown/burnt?
                          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

                          • Baileybum1234
                            Badcaps Veteran
                            • Sep 2012
                            • 245
                            • UK

                            #193
                            Re: LG 50PQ6000 unstable 5v standby

                            Just been replaced with a new 1N4007. The original was shorted.
                            Repaired: LG50PQ6000

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #194
                              Re: LG 50PQ6000 unstable 5v standby

                              The old one was as 1N4007? Or was it UF4007?
                              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

                              • Baileybum1234
                                Badcaps Veteran
                                • Sep 2012
                                • 245
                                • UK

                                #195
                                Re: LG 50PQ6000 unstable 5v standby

                                Give me a min I will double check.
                                Repaired: LG50PQ6000

                                Comment

                                • Baileybum1234
                                  Badcaps Veteran
                                  • Sep 2012
                                  • 245
                                  • UK

                                  #196
                                  Re: LG 50PQ6000 unstable 5v standby

                                  OK the original was an IN4007S 943 OR 1N4007S 943

                                  Its very hard to read and I can find data sheets on them both. :/

                                  The replacement is a: Silicon Rectifier Diode 1N4007 1 A 1000 V
                                  Repaired: LG50PQ6000

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #197
                                    Re: LG 50PQ6000 unstable 5v standby

                                    It would be 1N4007S not IN4007S.
                                    But anyway that's the right part.

                                    Is the new part shorted in any way?
                                    Does it measure 4.4V with main board unplugged?
                                    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

                                    • Baileybum1234
                                      Badcaps Veteran
                                      • Sep 2012
                                      • 245
                                      • UK

                                      #198
                                      Re: LG 50PQ6000 unstable 5v standby

                                      New 1N4007 seams ok with diode test on DVM.

                                      4.45vDC board unplugged.
                                      Repaired: LG50PQ6000

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #199
                                        Re: LG 50PQ6000 unstable 5v standby

                                        OK, can you buy beg borrow or steal a 10 ohm 5W resistor? We need to see if P/S is stable under load.
                                        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

                                        • Baileybum1234
                                          Badcaps Veteran
                                          • Sep 2012
                                          • 245
                                          • UK

                                          #200
                                          Re: LG 50PQ6000 unstable 5v standby

                                          I just happen to have 2 x 10 ohm 3w resistors in my hand.
                                          Repaired: LG50PQ6000

                                          Comment

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