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

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  • romasik
    Senior Member
    • May 2022
    • 56
    • Ukraine

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

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

    Comment

    • nomoresonys
      Badcaps Legend
      • Jan 2013
      • 12088
      • U.S.

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

      looks like it comes from c7901.

      Comment

      • romasik
        Senior Member
        • May 2022
        • 56
        • Ukraine

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

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

        Here is a very similar sheme

        Attached Files

        Comment

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12088
          • U.S.

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

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

          Comment

          • nomoresonys
            Badcaps Legend
            • Jan 2013
            • 12088
            • U.S.

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

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

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12088
              • U.S.

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

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

              Comment

              • dskall
                Badcaps Legend
                • Oct 2016
                • 2905
                • usa

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

                Originally posted by romasik
                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

                • romasik
                  Senior Member
                  • May 2022
                  • 56
                  • Ukraine

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

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

                  Comment

                  • romasik
                    Senior Member
                    • May 2022
                    • 56
                    • Ukraine

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

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

                    Comment

                    • romasik
                      Senior Member
                      • May 2022
                      • 56
                      • Ukraine

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

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

                      Comment

                      • nomoresonys
                        Badcaps Legend
                        • Jan 2013
                        • 12088
                        • U.S.

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

                        Originally posted by romasik
                        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

                        • dskall
                          Badcaps Legend
                          • Oct 2016
                          • 2905
                          • usa

                          #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

                          • romasik
                            Senior Member
                            • May 2022
                            • 56
                            • Ukraine

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

                            Originally posted by dskall
                            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

                            • romasik
                              Senior Member
                              • May 2022
                              • 56
                              • Ukraine

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

                              CAP c2 (C7907) i change but nothing changed

                              Comment

                              • dskall
                                Badcaps Legend
                                • Oct 2016
                                • 2905
                                • usa

                                #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

                                • romasik
                                  Senior Member
                                  • May 2022
                                  • 56
                                  • Ukraine

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

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

                                  Comment

                                  • dskall
                                    Badcaps Legend
                                    • Oct 2016
                                    • 2905
                                    • usa

                                    #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

                                    • romasik
                                      Senior Member
                                      • May 2022
                                      • 56
                                      • Ukraine

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

                                      Originally posted by dskall
                                      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

                                      • R_J
                                        Badcaps Legend
                                        • Jun 2012
                                        • 9534
                                        • Canada

                                        #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

                                        • romasik
                                          Senior Member
                                          • May 2022
                                          • 56
                                          • Ukraine

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

                                          Originally posted by R_J
                                          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

                                          Comment

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