17PW20.1 blows fuse right away

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  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales
    #21
    Re: 17PW20.1 blows fuse right away

    So are you saying the reading from the fuse to hot ground of the capacitor was 0.733K ohms = 733 ohms. You need to check the bridge rectifier. Plenty of youtube video's online to show how.
    Last edited by dick_barton; 12-24-2020, 01:23 PM.
    Willing to help but I'm no expert.

      Comment

      • wylcot
        Member
        • Dec 2020
        • 29
        • France
        #22
        Re: 17PW20.1 blows fuse right away

        I'm sorry but....
        I can't find any BR.
        I'm used to what they look like on pinball machines, but even on the manual, i can't spot a BR....

          Comment

          • diif
            Badcaps Legend
            • Feb 2014
            • 6978
            • England
            #23
            Re: 17PW20.1 blows fuse right away

            It's black and rectangular with a sloping corner. Just down from the power connector to the left of one of the two big coils.

              Comment

              • wylcot
                Member
                • Dec 2020
                • 29
                • France
                #24
                Re: 17PW20.1 blows fuse right away

                Oh, Ok !
                Thanks Diif !
                So it's D800, then... a GBU4M...
                That's the one i was eyeing on, as it has 4 pins.

                Ok. I'll try to check it...

                  Comment

                  • wylcot
                    Member
                    • Dec 2020
                    • 29
                    • France
                    #25
                    Re: 17PW20.1 blows fuse right away

                    Alright.
                    So I tested the BR according to techniques seen on Youtube...

                    So, between + and AC, I get 532
                    Between + and 2nd AC, I get 540

                    But then... between + and -, I should get the double, right?
                    And I only get 522.

                    Does that mean it's faulty?

                    Do you think I should unsolder it from the board to be sure to check it correctly ?
                    Attached Files

                      Comment

                      • dick_barton
                        Badcaps Legend
                        • Aug 2015
                        • 6642
                        • Wales
                        #26
                        Re: 17PW20.1 blows fuse right away

                        Test as if single diodes
                        AC1 to DC+
                        AC1 to DC -
                        AC2 to DC+
                        AC2 to DC-
                        Attached Files
                        Willing to help but I'm no expert.

                          Comment

                          • wylcot
                            Member
                            • Dec 2020
                            • 29
                            • France
                            #27
                            Re: 17PW20.1 blows fuse right away

                            Well then I get between 420 and 460...
                            four times.

                              Comment

                              • dick_barton
                                Badcaps Legend
                                • Aug 2015
                                • 6642
                                • Wales
                                #28
                                Re: 17PW20.1 blows fuse right away

                                That sounds OK
                                Can you measure the resistance from D824 to negative leg of that large capacitor (post #8) for each side of that diode. You will need to wait a few minutes after powering off the set to let the voltage on that capacito drain away.
                                Last edited by dick_barton; 12-27-2020, 07:55 AM.
                                Willing to help but I'm no expert.

                                  Comment

                                  • budm
                                    Badcaps Legend
                                    • Feb 2010
                                    • 40746
                                    • USA
                                    #29
                                    Re: 17PW20.1 blows fuse right away

                                    What resistance reading do you get when you measure between the two legs of the main filter cap in both directions? The meter should show low resistance first the the resistance should rise as the cap charged up.
                                    https://www.badcaps.net/forum/attach...4&d=1607373901
                                    Btw, you did check the PFC MOSFET and the PFC Diode mounted on the heatsink right next to the main filter cap, correct?
                                    Last edited by budm; 12-27-2020, 02:56 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

                                      • wylcot
                                        Member
                                        • Dec 2020
                                        • 29
                                        • France
                                        #30
                                        Re: 17PW20.1 blows fuse right away

                                        Well it seems fine.

                                        I'm giving up on this one.
                                        It'll go for spare parts.

                                        Thanks for the help, guys ! I learnt a lot !

                                          Comment

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