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Emerson hdtv troubleshooting

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    #81
    Re: Emerson hdtv troubleshooting

    is that pic ok?

    Comment


      #82
      Re: Emerson hdtv troubleshooting

      bump

      Comment


        #83
        Re: Emerson hdtv troubleshooting

        sorry,been extremely busy with our dog kennels and getting stuff ready for winter...
        Was hoping someone would jump in,will try and find some time tonight..
        Proud owner of dozens of broken TV's and many,many,many boards.


        Our website and passion:http://hollenhundshepherds.com/

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          #84
          Re: Emerson hdtv troubleshooting

          ok..

          Comment


            #85
            Re: Emerson hdtv troubleshooting

            Didn't forget about you.....super busy......Here's a gentle bump...selldoor,budm,tom66 anyone? I need some help with this one,too busy and it's getting close to being over my head
            Proud owner of dozens of broken TV's and many,many,many boards.


            Our website and passion:http://hollenhundshepherds.com/

            Comment


              #86
              Re: Emerson hdtv troubleshooting

              bump

              Comment


                #87
                Re: Emerson hdtv troubleshooting

                Coming back to fixing this tv....power board checks out ok,fuse is ok..but yet it looks like I have no power to the tv since the standby light is off when plugged in...could it be the cord itself?

                Comment


                  #88
                  Re: Emerson hdtv troubleshooting

                  This is old and long post so let's start fresh.
                  Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
                  Format:
                  Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
                  1 - XXXXXXX - XXv - XXXv
                  2 - XXXXXXX - XXXv - XXXv
                  3 - XXXXXXX - XXXv - XXXv
                  4 - etc.
                  I assume no responsibility for any stupid suggestions I might post.

                  Comment


                    #89
                    Re: Emerson hdtv troubleshooting

                    Working on the same board, observing similar symptoms, "all 5v" measures 4.4v when disconnected and 4.1v when connected to the main board.
                    P-ON-H2 is 0v
                    Not sure what P-ON H1 for and why there are two of them

                    Comment


                      #90
                      Re: Emerson hdtv troubleshooting

                      Well I jumped the P-ON-H2 to AL +5v and the power board turned on just fine. +24v and some other voltages are present.
                      So it's the main board which is faulty then. It does not send the turn on signal to the PSU.

                      I have the same TV as in attached service manual by Budm above: https://www.badcaps.net/forum/showpo...7&postcount=46.
                      The motherboard is ba17f1g0401 4_1
                      Checked the AL +3.3v on the main board and it is present.

                      What would I check next? The owner said there was a power surge or something.
                      Last edited by zape; 10-16-2019, 08:43 PM.

                      Comment


                        #91
                        Re: Emerson hdtv troubleshooting

                        Found out that P-ON+3.3V is shorted to ground on the main board (2 ohm)
                        Last edited by zape; 10-16-2019, 09:04 PM.

                        Comment


                          #92
                          Re: Emerson hdtv troubleshooting

                          What is your TV model number?
                          https://www.shopjimmy.com/emerson-a1...-main-cba.htm#
                          Is this your board?
                          I do not any pin out printed on the board for the P-ON+3.3V.
                          Last edited by budm; 10-16-2019, 09:16 PM.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment


                            #93
                            Re: Emerson hdtv troubleshooting

                            Magnavox 32MF301B/F7
                            Board looks similar with 4_1 at the end instead of 5_1
                            there is no any markings on the board

                            P-ON +3.3v is produced by IC3001 on the main board, see page 45 on the manual on the link above
                            Last edited by zape; 10-16-2019, 09:32 PM.

                            Comment


                              #94
                              Re: Emerson hdtv troubleshooting

                              checked the MLC caps and the diod and the're good
                              Attached Files
                              Last edited by zape; 10-16-2019, 09:47 PM.

                              Comment


                                #95
                                Re: Emerson hdtv troubleshooting

                                There are lots more caps connected in parallel to the PON-3.3V, some of them through the small inductors, not just what you have highlighted if look thorough the whole page, it is also fed to some other pages of the circuits too.
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment


                                  #96
                                  Re: Emerson hdtv troubleshooting

                                  Yeah it's spread over the board, unfortunately I don't have a thermal camera
                                  No idea how to find the short.

                                  Comment


                                    #97
                                    Re: Emerson hdtv troubleshooting

                                    P-ON 3.3V Source and filter caps.
                                    How many Ohms do you get on that line?
                                    Magnavox_32MF301b-f7_chassis_fl11-4
                                    Attached Files
                                    Never stop learning
                                    Basic LCD TV and Monitor troubleshooting guides.
                                    http://www.badcaps.net/forum/showthr...956#post305956

                                    Voltage Regulator (LDO) testing:
                                    http://www.badcaps.net/forum/showthr...999#post300999

                                    Inverter testing using old CFL:
                                    http://www.badcaps.net/forum/showthr...er+testing+cfl

                                    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                    http://s807.photobucket.com/user/budm/library/

                                    TV Factory reset codes listing:
                                    http://www.badcaps.net/forum/showthread.php?t=24809

                                    Comment


                                      #98
                                      Re: Emerson hdtv troubleshooting

                                      2.0-2.1 Ohm

                                      Comment


                                        #99
                                        Re: Emerson hdtv troubleshooting

                                        It is going to be fun trying to find out which cap is shorted out, there are so many MLCC connected to that line.
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment


                                          Re: Emerson hdtv troubleshooting

                                          I'll try to remove inductors

                                          so it is not after L3026 and L3019
                                          Last edited by zape; 10-16-2019, 10:55 PM.

                                          Comment

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