Jvc jlc32bc3000

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  • Nam3o
    Member
    • Dec 2010
    • 44

    #41
    Re: Jvc jlc32bc3000

    no change

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #42
      Re: Jvc jlc32bc3000

      OK, so I suspect this device is faulty. (See attached.)

      Can you get the part # on it? It is probably a PNP transistor but it could be a P-channel MOSFET.
      Attached Files
      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

      • Nam3o
        Member
        • Dec 2010
        • 44

        #43
        Re: Jvc jlc32bc3000

        Kia
        431a
        117

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #44
          Re: Jvc jlc32bc3000

          Oh, it's not either of those. I think I understand it. It's a voltage reference. It's regulating the 18V down to 12V, which is an odd way of doing things -- I'm not sure why they would do it that way. I need to trace out the circuit to understand why it's not working. I will be back.
          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.

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          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #45
            Re: Jvc jlc32bc3000

            OK, here is the voltage regulator part (see attached.) But I can't trace it fully yet as I don't know where R222 connects.

            I remember seeing this circuit in a Samsung TV too. I think it is to reduce the standby power, by using a single transformer.

            I need you to check which component this lead is part of (see attached.) I have a strong suspicion it is ground.
            Attached Files
            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.

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            • Nam3o
              Member
              • Dec 2010
              • 44

              #46
              Re: Jvc jlc32bc3000

              it connects to r285 then to q283.

              Comment

              • Nam3o
                Member
                • Dec 2010
                • 44

                #47
                Re: Jvc jlc32bc3000

                this what I found
                Attached Files

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #48
                  Re: Jvc jlc32bc3000

                  How difficult is it to make some tests on the power supply's rear side? I am thinking that the control signal is not reaching the TL431 or the TL431 is shorted out. I would need to know the voltage across R223.
                  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.

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                  • Nam3o
                    Member
                    • Dec 2010
                    • 44

                    #49
                    Re: Jvc jlc32bc3000

                    R223 0v

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #50
                      Re: Jvc jlc32bc3000

                      OK, in which case, I am thinking it is a problem elsewhere on the PSU. (Probably in that large component area near the power connector.) It's not getting a signal from that part.

                      Is there a part # on it? I'd love to debug it more but it's proving a bit beyond me. If it's only about $20-30, it could be worth it.
                      Last edited by tom66; 11-04-2012, 02:18 PM.
                      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

                      • Nam3o
                        Member
                        • Dec 2010
                        • 44

                        #51
                        Re: Jvc jlc32bc3000

                        I think this will help
                        Attached Files

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #52
                          Re: Jvc jlc32bc3000

                          Sorry, what?
                          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.

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                          • Nam3o
                            Member
                            • Dec 2010
                            • 44

                            #53
                            Re: Jvc jlc32bc3000

                            Originally posted by tom66
                            Sorry, what?

                            No? did I fail to understand?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #54
                              Re: Jvc jlc32bc3000

                              I was looking for the part number of the board, but I found it.
                              http://www.shopjimmy.com/vizio-0500-...t-inverter.htm

                              Never mind, it is very expensive! There is another thing you can do. If you don't mind the TV using a bit more power in standby, then the 12V can be forced on.
                              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

                              • Nam3o
                                Member
                                • Dec 2010
                                • 44

                                #55
                                Re: Jvc jlc32bc3000

                                sounds good to me.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #56
                                  Re: Jvc jlc32bc3000

                                  OK, see the attachment.

                                  You need to cut the jumper link on the top between the two pads.

                                  Then solder a 100 ohm resistor between the 18 ohm and the bottom most pad on the jumper link (nearest the KIA431.) 100 ohms is flexible. Anything up to a few 470 ohm down to 47 ohm should work. It's just to prevent damage in case of failure (the resistor should be the only casualty in the worst case.)

                                  Very important: BEFORE you connect the main board double check the 12V output is giving 12V and not 18V! It should now be 12V all the time.
                                  Attached Files
                                  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

                                  • Nam3o
                                    Member
                                    • Dec 2010
                                    • 44

                                    #57
                                    Re: Jvc jlc32bc3000

                                    that did restore the 12v pins but it still wont turn on.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #58
                                      Re: Jvc jlc32bc3000

                                      OK, that is very odd. I am confused, it should work. Was the TV hit by a surge? Any idea how it failed? Any different symptoms with 12V now?
                                      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

                                      • Nam3o
                                        Member
                                        • Dec 2010
                                        • 44

                                        #59
                                        Re: Jvc jlc32bc3000

                                        no surge. the TV just slowly stopped coming on reliably. 12v seems ok

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #60
                                          Re: Jvc jlc32bc3000

                                          Does the TV do anything differently at all? Like, if it had no power LED before, does it have one? Can you turn it off once it is turned on?
                                          You say it stopped turning on reliably -- does this mean it would turn on once in a while, but not always? Did it get slowly worse over time?
                                          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

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