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Sharp LC-60SQ15U TV DPS-167CP - No power

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    #41
    Re: Sharp LC-60SQ15U TV DPS-167CP - No power

    Where should the voltage come from on the 5th leg A6069H?

    Comment


      #42
      Re: Sharp LC-60SQ15U TV DPS-167CP - No power

      looks like it comes from c7901.

      Comment


        #43
        Re: Sharp LC-60SQ15U TV DPS-167CP - No power

        Originally posted by nomoresonys View Post
        looks like it comes from c7901.
        no c7901 leg 8 .

        Here is a very similar sheme

        Attached Files

        Comment


          #44
          Re: Sharp LC-60SQ15U TV DPS-167CP - No power

          I see, ok check c7906, r7909, r7919, d7904.

          Comment


            #45
            Re: Sharp LC-60SQ15U TV DPS-167CP - No power

            make sure the resistors are the correct value and not open.

            Comment


              #46
              Re: Sharp LC-60SQ15U TV DPS-167CP - No power

              Originally posted by romasik View Post
              Where should the voltage come from on the 5th leg A6069H?
              is this the vcc voltage?

              Comment


                #47
                Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                Originally posted by romasik View Post
                Where should the voltage come from on the 5th leg A6069H?
                Use data sheet. Pin 7,8 are the startup voltage
                I assume no responsibility for any stupid suggestions I might post.

                Comment


                  #48
                  Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                  Originally posted by dskall View Post
                  Use data sheet. Pin 7,8 are the startup voltage
                  Why??
                  Attached Files

                  Comment


                    #49
                    Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                    Originally posted by dskall View Post
                    use data sheet. Pin 7,8 are the startup voltage
                    Attached Files

                    Comment


                      #50
                      Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                      Originally posted by nomoresonys View Post
                      I see, ok check c7906, r7909, r7919, d7904.
                      everything is fine in my opinion

                      Comment


                        #51
                        Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                        Originally posted by romasik View Post
                        Hello, please help me i have same problem on my Sharp Aquos 60LC635E No 5V power, tv dead . Blown R7900 and short D7950 . I changed it, than blown R7900 again . D7950 ok. I change IC7903 and cap on 5 leg 50V 47u and R7900 never blown again but 5V not( I do not know what to do . On big two cap 315V, on 5 leg IC7903 9V this very low for start A6069H . Datasheet say min 13V.

                        Please Help me. board power supply dps-162KP B RUNTKA932WJQZ
                        The voltage isn't high enough, just like you said here, the question is why, I can't figure it out but one of the pros knows I bet.

                        Comment


                          #52
                          Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                          9.1 Startup Operation
                          Figure 9-1 shows the circuit around IC. Figure 9-2
                          shows the start up operation.
                          The IC incorporates the startup circuit. The circuit is
                          connected to D/ST pin. When D/ST pin voltage reaches
                          to Startup Circuit Operation Voltage VST(ON) = 38 V, the
                          startup circuit starts operation.
                          During the startup process, the constant current,
                          ISTARTUP = − 2.5 mA, charges C2 at VCC pin. When
                          VCC pin voltage increases to VCC(ON) = 15.3 V, the
                          control circuit starts operation
                          I assume no responsibility for any stupid suggestions I might post.

                          Comment


                            #53
                            Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                            Originally posted by dskall View Post
                            9.1 Startup Operation
                            Figure 9-1 shows the circuit around IC. Figure 9-2
                            shows the start up operation.
                            The IC incorporates the startup circuit. The circuit is
                            connected to D/ST pin. When D/ST pin voltage reaches
                            to Startup Circuit Operation Voltage VST(ON) = 38 V, the
                            startup circuit starts operation.
                            During the startup process, the constant current,
                            ISTARTUP = − 2.5 mA, charges C2 at VCC pin. When
                            VCC pin voltage increases to VCC(ON) = 15.3 V, the
                            control circuit starts operation
                            between 3rd and 8th leg 300V

                            Comment


                              #54
                              Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                              CAP c2 (C7907) i change but nothing changed

                              Comment


                                #55
                                Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                Check pin 5 diode, resistor and cap.
                                I assume no responsibility for any stupid suggestions I might post.

                                Comment


                                  #56
                                  Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                  Originally posted by dskall View Post
                                  Check pin 5 diode, resistor and cap.
                                  i check, all ok

                                  Comment


                                    #57
                                    Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                    If all components off of pin5 are good. May have bad ic.
                                    I assume no responsibility for any stupid suggestions I might post.

                                    Comment


                                      #58
                                      Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                      Originally posted by dskall View Post
                                      If all components off of pin5 are good. May have bad ic.
                                      So I replaced it with a new one.

                                      My friend advises me to change IC7801, but I don't understand how it can affect IC7903

                                      Comment


                                        #59
                                        Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                        What is the voltage on pin 4 of ic7903, this is the FB (feedback) voltage.
                                        Is R7907 ok?
                                        IC7801 will not effect ic7903. IC7801 is the pfc driver ic. and is not active in standby
                                        Last edited by R_J; 05-19-2022, 11:38 AM.

                                        Comment


                                          #60
                                          Re: Sharp LC-60SQ15U TV DPS-167CP - No power

                                          Originally posted by R_J View Post
                                          What is the voltage on pin 4 of ic7903, this is the FB (feedback) voltage.
                                          Is R7907 ok?
                                          IC7801 will not effect ic7903. IC7801 is the pfc driver ic. and is not active in standby
                                          7907 check his ok, on 4 legs 40mV

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