PHILIPS 37PFL8404h/12 power issues.

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  • crazykill
    Member
    • Jun 2016
    • 11
    • Bulgaria

    #1

    PHILIPS 37PFL8404h/12 power issues.

    Hello everyone i recently found a cheap broken Philips 37inch lcd tv.I have decided to try repairing it.I have tried the flashlight method.The tv turns on with no picture and red light for less then a second followed by 18 white led flashes.So far i have checked the ouputs on the power board everything is in the range but the INV-OK pin is 0V.Any suggestions will be appreciated
    Good day to all.
    Last edited by crazykill; 06-04-2016, 07:38 AM. Reason: Wrong title.
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: PHILIPS 37PFL8404h/12 power issues.

    Post some clear photo's as attachments and also of the legends printed alongside or nearby giving the voltages of each pin of the connectors will be a good starting point for people to assist you.
    Willing to help but I'm no expert.

    Comment

    • crazykill
      Member
      • Jun 2016
      • 11
      • Bulgaria

      #3
      Re: PHILIPS 37PFL8404h/12 power issues.

      My bad i should have started with that.

      Quick note PS-On pin jumps to 3.3V when the power button is pushed all other pins remain the same.

      Comment

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #4
        Re: PHILIPS 37PFL8404h/12 power issues.

        Maybe worth having a quick look
        Looks like the set suffers from burning up the high voltage caps on the inverter outputs

        http://www.lcdtvrepair.us/faults/Phi...L8404H_12--929

        http://www.hifi-forum.de/viewthread-152-9820.html

        https://www.youtube.com/watch?v=CEKwZ8p3mxs
        Last edited by dick_barton; 06-04-2016, 09:21 AM.
        Willing to help but I'm no expert.

        Comment

        • crazykill
          Member
          • Jun 2016
          • 11
          • Bulgaria

          #5
          Re: PHILIPS 37PFL8404h/12 power issues.

          Thanks i will take a look.But even if the inverter is not working the set should at least power on normally right ?

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: PHILIPS 37PFL8404h/12 power issues.

            Only if it does not return an inverter fault signal if there is one, back to the main board.
            You said INV_OK = 0 so that could be the inverter fault signal.
            Willing to help but I'm no expert.

            Comment

            • crazykill
              Member
              • Jun 2016
              • 11
              • Bulgaria

              #7
              Re: PHILIPS 37PFL8404h/12 power issues.

              So i checked the caps there are two pairs consisting of 33J and 47j both 6Kv on one of the pairs the 33J one is fried i will replace it and report back.Thanks again for the help.
              Last edited by crazykill; 06-04-2016, 10:41 AM.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #8
                Re: PHILIPS 37PFL8404h/12 power issues.

                Originally posted by crazykill
                So i checked the caps there are two pairs consisting of 33J and 47j both 6Kv on one of the pairs the 33J one is fried i will replace it and report back.Thanks again for the help.
                They apppear to be a weakness in this set so I would change all four of them rather than finding out that the others are about to fail.
                Willing to help but I'm no expert.

                Comment

                • crazykill
                  Member
                  • Jun 2016
                  • 11
                  • Bulgaria

                  #9
                  Re: PHILIPS 37PFL8404h/12 power issues.

                  Yea figured that out.I ordered 4 of every type just to be safe.

                  Comment

                  • Th3_uN1Qu3
                    Believe in
                    • Jul 2010
                    • 6031
                    • Romania

                    #10
                    Re: PHILIPS 37PFL8404h/12 power issues.

                    Anyone got a service manual for this TV? I am trying to find the part number of the mainboard to Tcon cable - it's missing on this set i have here.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk

                      #11
                      Re: PHILIPS 37PFL8404h/12 power issues.

                      Originally posted by Th3_uN1Qu3
                      Anyone got a service manual for this TV? I am trying to find the part number of the mainboard to Tcon cable - it's missing on this set i have here.
                      not sure what chassis number is used in your set but maybe this
                      Attached Files

                      Comment

                      • Th3_uN1Qu3
                        Believe in
                        • Jul 2010
                        • 6031
                        • Romania

                        #12
                        Re: PHILIPS 37PFL8404h/12 power issues.

                        Thank you, the manual is right but it didn't help with the part number. I was able to find it though, it's these two cables here: http://www.harryelectronics.com/cabl...3139-171-04941

                        Now i have asked the guy who has the power supply for sale here, maybe he has the cables as well so i can get a combo deal. I suspect there is a good reason why these parts were taken out of this particular set, it could have a CCFL (fixable) or panel (unfixable) failure so in case it is a bad panel, i am trying to get them as cheap as i possibly can.
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                        Comment

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