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sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

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    #21
    Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

    Also i thought 12V was the trigger to kick on the inverter boards not TCON but i could be wrong
    IC5702 is KIA 378R12PI

    other pinout on psu board connect small one is as follows

    PD cn5703

    PS_ON pin 1 2.91v
    AC_DET pin2 3,3v
    GND pin3 0V
    PNL_POW pin4 0V
    BU5V pin5 4.98v
    GND pin6 0v

    also on main board 4pin connector that goes to inverter to trigger on has no voltage, but i suspect this is due to Main board not racing 12V power on

    Comment


      #22
      Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

      If you force the PSU on, are all power rails o.k.?

      Comment


        #23
        Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

        do you mean by shorting PS_ON and AC_DET

        Comment


          #24
          Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

          Or PS_ON to GND

          Comment


            #25
            Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

            Originally posted by frankriz99 View Post
            Or PS_ON to GND
            That one.

            Comment


              #26
              Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

              Jump ps_on to ground, then see if you have the expected voltages.

              Comment


                #27
                Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                https://www.youtube.com/watch?v=mUvclBfaMXg Video demonstrating procedure.

                Comment


                  #28
                  Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                  You don't have to remove the board tho, just disconnect all the other boards.

                  Comment


                    #29
                    Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                    ok took whole new PSU out of tv and put it on the bench shorted PS_ON to ground.

                    PSU became active here are my voltage (note 12V still not there)

                    13.45v
                    13.45v
                    0V
                    0V
                    10.21v
                    10.21v
                    0v
                    0v
                    0v -should be 12V
                    0v - should be 12V
                    0V
                    5.99V

                    Comment


                      #30
                      Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                      you always need put the pin out name with the voltages measured. Is there a BL_on?

                      Comment


                        #31
                        Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                        CN5702

                        13.45v pin 12 AMP_13v
                        13.45v pin 11 AMP_13v
                        0V Pin 10 GND
                        0V Pin 9 GND
                        10.21v pin 8 10V
                        10.21v pin 7 10V
                        0v pin6 GND
                        0v pin5 GND
                        0v pin4 PNL 12V (-should be 12V)
                        0V pin3 PNL 12V (-should be 12V)
                        0V pin 2 GND
                        5.99V pin1 6V


                        CN5703

                        Pin1 PS_ON 2.91V
                        Pin 2 AC_DET 3.29V
                        Pin3 GND 0V
                        pin 4 PNL_POW 0V
                        pin 5 BU5V 4.98V
                        pin 6 GND 0V


                        also i notice on main board (not PSU) there are 2 solid RED led on, and one constantly flashing red led

                        Comment


                          #32
                          Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                          Looks like it may be right, does not look like you activated bl_on, right? you just jumpered ps_on and ground if that's correct theory then it looks like the powersupply is ok.
                          Last edited by nomoresonys; 03-24-2018, 01:30 PM.

                          Comment


                            #33
                            Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                            http://www.shopjimmy.com/sharp-rdenc...pply-board.htm pic. of powersupply if that's it.

                            Comment


                              #34
                              Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                              'pin 4 PNL_POW 0V' Main board is not sending the control signal to run on PNL12V which is supplied by the switched 12V LDO IC5702 KIA 378R12PI.
                              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


                                #35
                                Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                Originally posted by frankriz99 View Post
                                CN5702

                                13.45v pin 12 AMP_13v
                                13.45v pin 11 AMP_13v
                                0V Pin 10 GND
                                0V Pin 9 GND
                                10.21v pin 8 10V
                                10.21v pin 7 10V
                                0v pin6 GND
                                0v pin5 GND
                                0v pin4 PNL 12V (-should be 12V)
                                0V pin3 PNL 12V (-should be 12V)

                                0V pin 2 GND
                                5.99V pin1 6V


                                CN5703

                                Pin1 PS_ON 2.91V
                                Pin 2 AC_DET 3.29V
                                Pin3 GND 0V
                                pin 4 PNL_POW 0V
                                pin 5 BU5V 4.98V
                                pin 6 GND 0V


                                also i notice on main board (not PSU) there are 2 solid RED led on, and one constantly flashing red led
                                Are these Voltage you are showing are done with all the connectors back in place? Or it's done with PS-ON pin connected to GND which then doe not make sense since you still show PS-ON 2.91V. Please clarify.
                                It looks to me the PS-ON has to be high for the rest of the power supply to be turned on based on your Voltage readings.
                                Last edited by budm; 03-24-2018, 02:46 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


                                  #36
                                  Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                  BTW, we still need to upload pictures of the whole backside of the TV showing all the boards, the other thread you made the Photobucket had blocked your pictures.
                                  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


                                    #37
                                    Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                    is there anyway to assert the PNL_PWR to see if inverter will fire up.









                                    Comment


                                      #38
                                      Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                      photobucket wont work without browser extension .
                                      try uploading here or a different place than photobucket

                                      Comment


                                        #39
                                        Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                        here are pics attached again
                                        Attached Files

                                        Comment


                                          #40
                                          Re: sharp lc52d62u LCD TV no 12V coming out of PSU all other voltages ok

                                          BTW, service manual has error codes on page 6-17, -18.
                                          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

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