Can you dignose from the photo ? . Toshiba 65S2650EV

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  • Ancient1
    Badcaps Veteran
    • Dec 2019
    • 275
    • Israel

    #201
    Re: Can you dignose from the photo ? . Toshiba 65S2650EV

    It isn't possible to make a mistake with the AZ431 placement , there is a mark on the board with the flat-curve shape of a transistor.

    With regard to NCP1653, I searched ALL the stuff I have and didn't find another, so for now , I will solder new, but lower Wattage R37 5.6K that I found - with big solder blobs to serve as heatsinks, maybe even tiny copper plate to each side. we'll see.

    I will test in auto-start mode of course.

    Comment

    • Ancient1
      Badcaps Veteran
      • Dec 2019
      • 275
      • Israel

      #202
      Re: Can you dignose from the photo ? . Toshiba 65S2650EV

      R37 replaced . measures ~5.6k Ohm in-circuit.

      PSU powered : 5VSB = 5.2V
      PSU Auto-Started : 5V pin = 300mV. 12V Pin = GND . SHORT ( I didn't realize that before ). No High V

      IC3
      Pin12 VCC = 6.24V
      Pin16 Vboot = 6.04

      IC2 - See Image
      Attached Files

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4567
        • Russia

        #203
        Re: Can you dignose from the photo ? . Toshiba 65S2650EV

        Ncp1653
        Attached Files

        Comment

        • Davi.p
          Hobbist Tech
          • Sep 2009
          • 4311
          • Italy - Milan

          #204
          Re: Can you dignose from the photo ? . Toshiba 65S2650EV

          test pin 1 Q10, test in diode mode all big diodes on cold side

          Comment

          • Ancient1
            Badcaps Veteran
            • Dec 2019
            • 275
            • Israel

            #205
            Re: Can you dignose from the photo ? . Toshiba 65S2650EV

            Originally posted by lotas
            Ncp1653
            What does hysteresis mean in regard to measuring ?

            Davi.p : I already did measure Diodes but will do again.
            and measure Pin1 of Q10

            Comment

            • Ancient1
              Badcaps Veteran
              • Dec 2019
              • 275
              • Israel

              #206
              Re: Can you dignose from the photo ? . Toshiba 65S2650EV

              Check this out
              D13
              Attached Files

              Comment

              • Davi.p
                Hobbist Tech
                • Sep 2009
                • 4311
                • Italy - Milan

                #207
                Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                i tell you big double diodes, them have 3 inline pins under heat sink

                Comment

                • Ancient1
                  Badcaps Veteran
                  • Dec 2019
                  • 275
                  • Israel

                  #208
                  Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                  OK. will do.

                  Do you think I should check D13 Diode Out-Of-Circuit ?

                  Comment

                  • Davi.p
                    Hobbist Tech
                    • Sep 2009
                    • 4311
                    • Italy - Milan

                    #209
                    Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                    i don't think you must focus on them, so you measure short on 12v output? also with ohmmeter? I don't understand which influence can do the pfc circuit (ic2) with standby ps, this is very obscure.. with psu auto started check tension on the bigger electrolitics hot side, check also ic2 pin4 to gnd in ohm..
                    Last edited by Davi.p; 01-10-2022, 03:07 PM.

                    Comment

                    • Ancient1
                      Badcaps Veteran
                      • Dec 2019
                      • 275
                      • Israel

                      #210
                      Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                      D13 , a W1 diode ( zener ?) on Cold side : I see V in both directions , unlike the others nearby. Looks like D13 is bad and I need to find replacement. see last Photo

                      Measuring resistance in cold PSU :

                      12V : ~2K Ohm . rising
                      5V : 19.6M Ohm . stable
                      5VSB : ~2.5K Ohm. rising
                      PS : 4.4M Ohm . stable

                      IC2 Pin4 (CS) to Pin6 (GND) : 5.6K . stable

                      Big Capacitors : you mean the Main Capacitors :
                      This is standard check. I measured now, PSU Auto-Started : 308V

                      Now I plan to test the Components under the heatsink on Cold side

                      Comment

                      • Ancient1
                        Badcaps Veteran
                        • Dec 2019
                        • 275
                        • Israel

                        #211
                        Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                        Heatsink out
                        2 x 60FCT
                        2 x 100FCT

                        Any special way to check these Schottky ?
                        Attached Files

                        Comment

                        • Davi.p
                          Hobbist Tech
                          • Sep 2009
                          • 4311
                          • Italy - Milan

                          #212
                          Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                          The PFC is not working, this because its vcc is below 8,5v, i told you to measure pin1 q10, i guess it's a bit low, test also pin2, if it's around 4,9v then remove ic2 and test again pin1&2... the idea to remove heatsink is not good because there's no short in the output, forget D13 for now, it is good until you don't test it outside and it's almost 100% ok
                          Last edited by Davi.p; 01-11-2022, 12:48 PM.

                          Comment

                          • Ancient1
                            Badcaps Veteran
                            • Dec 2019
                            • 275
                            • Israel

                            #213
                            Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                            IC2 is PFC circuit. you say its Vcc is below 8.5V = too low ?
                            report Pin1 Q10 Voltage, and Pin 2 & if it is ~4.9V - remove IC2 and measure them again.

                            I'm sorry, but I can't find q10 ? where is it ?

                            I will solder the heatsink back for testing.

                            Comment

                            • Davi.p
                              Hobbist Tech
                              • Sep 2009
                              • 4311
                              • Italy - Milan

                              #214
                              Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                              fisrt qst: yes. Check post #165 to find q10

                              Comment

                              • Ancient1
                                Badcaps Veteran
                                • Dec 2019
                                • 275
                                • Israel

                                #215
                                Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                IC2 is PFC circuit. you say its Vcc is 4.98 below 8.5V = too low ?
                                report Pin1 Q10 Voltage 11V, and Pin 2 10.9V & if it is ~4.9V - remove IC2 and measure them again.

                                So, Q10 looks OK , but IC2 Vcc is very low

                                I uploaded IC2 Vcc test to be sure I did not make a mistake in the pins
                                Attached Files
                                Last edited by Ancient1; 01-12-2022, 12:33 PM.

                                Comment

                                • Davi.p
                                  Hobbist Tech
                                  • Sep 2009
                                  • 4311
                                  • Italy - Milan

                                  #216
                                  Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                  Where it is the fast reply box??

                                  Check the path from q10 to ic2, so D6, Q11, ZD3, R81..

                                  Comment

                                  • Ancient1
                                    Badcaps Veteran
                                    • Dec 2019
                                    • 275
                                    • Israel

                                    #217
                                    Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                    Originally posted by Davi.p
                                    Where it is the fast reply box??
                                    what ?

                                    Comment

                                    • Davi.p
                                      Hobbist Tech
                                      • Sep 2009
                                      • 4311
                                      • Italy - Milan

                                      #218
                                      Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                      was a message to the staff mainly, don't worry

                                      Comment

                                      • Ancient1
                                        Badcaps Veteran
                                        • Dec 2019
                                        • 275
                                        • Israel

                                        #219
                                        Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                        See Photo
                                        Q11 is a transistor

                                        Resistors near IC2 are OK
                                        Attached Files

                                        Comment

                                        • Diah
                                          Badcaps Legend
                                          • Feb 2013
                                          • 6357
                                          • Germany

                                          #220
                                          Re: Can you dignose from the photo ? . Toshiba 65S2650EV

                                          wow so long threat... you are swiming against the wave...
                                          yours OP photo and this too

                                          yours issue at LEDs back light or at the LED driver baords.. strip the screen out of the set the set will boot with out screen ...and you will see the shadow where it come from.

                                          Comment

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