Dead Vestel 17IPS71 power board

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  • fnets
    Member
    • Oct 2017
    • 23
    • UK

    #121
    Re: Dead Vestel 17IPS71 power board

    fantastic (yes can solder)

    Comment

    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk

      #122
      Re: Dead Vestel 17IPS71 power board

      this looks like the ic check on your board that it uses this ic it may not be faulty yet tests should prove either way
      https://www.ebay.co.uk/itm/FAIRCHILD...cAAOSwc-tY3WfY

      Comment

      • fnets
        Member
        • Oct 2017
        • 23
        • UK

        #123
        Re: Dead Vestel 17IPS71 power board

        brilliant thank you. going through tests this morning starting page 1.

        I'll probably replace the ic anyway but can't find anything similar to this on the board?

        https://www.ebay.co.uk/itm/FAIRCHILD...cAAOSwc-tY3WfY

        1. voltages across C19=325v, C20=324v, C21=324v
        2. Diodes seem ok but ...

        on diode setting my multimeter (Sealey MM19) shows 1 for open line. With -ve probe on grey band side I get a voltage. With +ve probe on grey band side I get voltage and then settles down to 1 after a few seconds. If useful I can detail the results for each one (but unsure how to identify other than referring to image)?
        Last edited by fnets; 11-02-2017, 03:01 AM.

        Comment

        • vinceroger69
          Badcaps Legend
          • Mar 2012
          • 6714
          • uk

          #124
          Re: Dead Vestel 17IPS71 power board

          the ic should be on the bottom of the board somewhere and diodes that read odd i just un solder one side lift it up from the board and retest. Im still learning myself so im hoping a more experienced member will give us some assistance to but for now do your best and follow this thread and run the tests suggested by the others.

          Comment

          • fnets
            Member
            • Oct 2017
            • 23
            • UK

            #125
            Re: Dead Vestel 17IPS71 power board

            I hope we can both learn something from this.

            Here's my board



            ic probably on the underside?



            how do I test this? (also what does an led mosfet look like?)
            Last edited by fnets; 11-02-2017, 04:36 AM.

            Comment

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk

              #126
              Re: Dead Vestel 17IPS71 power board

              i hope so too the trouble is when we zoom into your pictures we cant see the part numbers etc on the ic s etc so it makes it hard to see what particular ic s etc are fitted on your psu can you try re uploading them maybe try this , click on go advanced then theirs a paper clip icon click on that and add your pictures that way.

              Comment

              • fnets
                Member
                • Oct 2017
                • 23
                • UK

                #127
                Re: Dead Vestel 17IPS71 power board

                the information of the ic is very small so it may be a problem but the one above has 6300A MYC on it (I can only just make it out). but still haven't found the problem so how do I test this (do I need it plugged in?)
                Last edited by fnets; 11-02-2017, 05:20 AM.

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                • fnets
                  Member
                  • Oct 2017
                  • 23
                  • UK

                  #128
                  Re: Dead Vestel 17IPS71 power board

                  re dick_barton above "So you have rectified DC so now to find out why you have no DC outputs". I'm going to check DC output again.

                  Comment

                  • dick_barton
                    Badcaps Legend
                    • Aug 2015
                    • 6642
                    • Wales

                    #129
                    Re: Dead Vestel 17IPS71 power board

                    If you have no DC at the output then I would consider replacing the FAN6300A
                    Willing to help but I'm no expert.

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk

                      #130
                      Re: Dead Vestel 17IPS71 power board

                      Thanks dick-barton you have more experience than i have in repairs, i did advise to replace that ic and added a link, but he could not find it on his board? hence i asked for better pictures so we could point out the ic.

                      Comment

                      • fnets
                        Member
                        • Oct 2017
                        • 23
                        • UK

                        #131
                        Re: Dead Vestel 17IPS71 power board

                        help has been fantastic, thank you.

                        Have ordered a new FAN6300A

                        this is tiny, any advise on replacing.
                        Last edited by fnets; 11-02-2017, 08:09 AM.

                        Comment

                        • vinceroger69
                          Badcaps Legend
                          • Mar 2012
                          • 6714
                          • uk

                          #132
                          Re: Dead Vestel 17IPS71 power board

                          Originally posted by fnets
                          I hope we can both learn something from this.

                          Here's my board



                          ic probably on the underside?



                          how do I test this? (also what does an led mosfet look like?)
                          led mosfet i think maybe q17? bottom side of board hopefully dick-barton will advise although i think your issue maybe that fan6300 ic i sent the ebay link for
                          Last edited by vinceroger69; 11-02-2017, 08:08 AM.

                          Comment

                          • dick_barton
                            Badcaps Legend
                            • Aug 2015
                            • 6642
                            • Wales

                            #133
                            Re: Dead Vestel 17IPS71 power board

                            I think your mosfet to check out is Q15. Hard to tell from the pictures.
                            Check all the diodes around the FAN IC and the Mosfet
                            Attached Files
                            Willing to help but I'm no expert.

                            Comment

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk

                              #134
                              Re: Dead Vestel 17IPS71 power board

                              Originally posted by dick_barton
                              I think your mosfet to check out is Q15. Hard to tell from the pictures.
                              Check all the diodes around the FAN IC and the Mosfet
                              The pictures in post 2 are zoom able and clear i first thought q15 then edited my post as wasnt really sure
                              Last edited by vinceroger69; 11-02-2017, 09:51 AM.

                              Comment

                              • fnets
                                Member
                                • Oct 2017
                                • 23
                                • UK

                                #135
                                Re: Dead Vestel 17IPS71 power board

                                can I ask what q15 means?

                                Comment

                                • vinceroger69
                                  Badcaps Legend
                                  • Mar 2012
                                  • 6714
                                  • uk

                                  #136
                                  Re: Dead Vestel 17IPS71 power board

                                  on the board you have printing by each component q15 is the a reference designator, we think its the led driver mosfet you have been asking about earlier in the thread q basically means transistor like c then a number means its a capacitor r then a number is a resistor this link is quite good.
                                  https://electronics.stackexchange.co...-markings-mean

                                  Comment

                                  • fnets
                                    Member
                                    • Oct 2017
                                    • 23
                                    • UK

                                    #137
                                    Re: Dead Vestel 17IPS71 power board

                                    ok thanks

                                    this is q17



                                    should I test this? (if so how)
                                    Last edited by fnets; 11-03-2017, 03:16 AM.

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk

                                      #138
                                      Re: Dead Vestel 17IPS71 power board

                                      q17 yes thats the one i thought may of been the led driver mosfet but dick-barton mentioned it maybe q15 which is on the top side of the pcb under a black heat sink i think
                                      this guide may help you
                                      https://www.youtube.com/watch?v=RkWy1EirEu8

                                      Comment

                                      • Joba01
                                        New Member
                                        • Jul 2018
                                        • 1
                                        • Österreich

                                        #139
                                        Re: Dead Vestel 17IPS71 power board

                                        Hi guys, thanks a lot for all the descriptions, it already helped a lot to understand the process and common falts. I have the same vestel board in a 'Telefunken' TV. The standby LED on the front is blinking. I tried all measuring than you described. On the CN4 output connector I read the 12 volt but I don't get the 5v standby voltage, any guesses what could be wrong? I also read 2.5v on pin7(the 4th pin in the upper row, starting from the pin that is marked as 1 on the board). I could't find a shorted diode, I still changed d22, d24 and d26 but that was more like last resort . The mosfet is a FDD120AN15A0, I tried to measure the DC voltage to ground it was 34v between source and drain and 34v between gate and drain, not sure how to interpret that. Hopefully you guys have a hint, best joba

                                        Comment

                                        • Calderon
                                          New Member
                                          • Sep 2018
                                          • 1
                                          • Finland

                                          #140
                                          Re: Dead Vestel 17IPS71 power board

                                          Hi, i have Finlux TV with this same powersuplly, measured between q17 drain and source and its shorted? Also when this is plugged in i hear very high pitched noise going louder about 2 secs and then silence for 3-4 sec and again, as itś trying to start or something.. this comes from the powerboard..?

                                          Comment

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