Philips 190S LCD power problem

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  • joeh
    Member
    • Jul 2011
    • 26

    #41
    Re: Philips 190S LCD power problem

    scuse me bill i test it in ohm and the digital tester says "1. " this is a bad functionality?

    Comment

    • alexanna
      Member
      • Mar 2010
      • 1346

      #42
      Re: Philips 190S LCD power problem

      Originally posted by joeh
      scuse me bill i test it in ohm and the digital tester says "1. " this is a bad functionality?
      A “1” on the left side of the display indicates the circuit is open or there is no connection between the 2 points you're measuring.
      If you see a 0 on the right side of the display that means there is no resistance in the circuit, that would be the reading you would expect to see with the 2 DMM leads touching.
      If you attach a picture of the transformer, He will be able to point to the pins you need to connect your leads to.
      Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

      Comment

      • joeh
        Member
        • Jul 2011
        • 26

        #43
        Re: Philips 190S LCD power problem

        Originally posted by alexanna
        A “1” on the left side of the display indicates the circuit is open or there is no connection between the 2 points you’re measuring.
        If you see a 0 on the right side of the display that means there is no resistance in the circuit, that would be the reading you would expect to see with the 2 DMM leads touching.
        If you attach a picture of the transformer, He will be able to point to the pins you need to connect your leads to.
        THIS IS THE TRANSFORMER cod. IT-E19-NB4004B
        tested side with 2 pin
        Attached Files

        Comment

        • PlainBill
          Badcaps Legend
          • Feb 2009
          • 7034
          • USA

          #44
          Re: Philips 190S LCD power problem

          Originally posted by joeh
          THIS IS THE TRANSFORMER cod. IT-E19-NB4004B
          tested side with 2 pin
          Excellent. You measured the resistance between the two pins on the right end of the transformer. Set your DMM to the 2K Ohms range. If I read your initial measurement correctly, the ACTUAL resistance was about 550 ohms for the good transformer. Post a picture of the meter while you are making the reading.

          It isn't unusual for a winding to break. That would give you a reading of open. If the transformer is bad, they are available on eBay for $9.00, including shipping.

          PlainBill
          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

          Comment

          • joeh
            Member
            • Jul 2011
            • 26

            #45
            Re: Philips 190S LCD power problem

            Thanks Bill, today i have replaced the faulty inverter with the new one and the monitor now lives again.

            Comment

            • Proit
              New Member
              • May 2012
              • 1
              • Turkey

              #46
              Re: Philips 190S LCD power problem

              Hi sir,

              i was test and no output 5 ,3.3,12 vdc and burned 6105,2103 and 7103 i was changed and no result and check PMW 8pins HV input and 19 VDC VCC 5 vdc

              Comment

              • barista
                New Member
                • Dec 2012
                • 1
                • Belgium

                #47
                Re: Philips 190S LCD power problem

                The CCFL backlight fails after 5 minutes, switching on/off and this will give me 5 more minutes
                The primary coil of the ccfl transformer measured a DC resitance of 450 ohms (not desoldered from board)

                I'have already replaced the Elcaps exept the 1000uf ( but they looks fine and measured the right val)

                It looks like i heave a thermal problem or my ccfl is failing
                How can i test the ccfl

                i can disconnect one ccfl pair and see what happens

                Comment

                • selldoor
                  Slow Learner
                  • Dec 2010
                  • 7870

                  #48
                  Re: Philips 190S LCD power problem

                  You need to measure both secondary ( Not Primary) windings and compare them. I do not think that will be the problem if it stays on for 5 minutes.

                  Turn the brightness down and see if it stays on any longer.

                  It could be the ccfls or the wiring - do you have any spare bulbs or another monitor
                  or faulty laptop
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #49
                    Re: Philips 190S LCD power problem

                    I had worked on HP W XX series with bad lamp wirings, some of them be running for 3~4 hours before he baclights go out, found that the wires to the end of the lamps were just touching the lamp's end terminals, after heat up the wire will no loger make contact with the end of the lamp due to heat expansion. Fiex many of these HP W series from 17~22" all with the same failure.
                    You need to make at least two test lamps to verifiy the inverter board functions otherwise you will be spending lots of time try to figure out if you have lamp or board problem.
                    http://s807.photobucket.com/albums/y...HP/HP%20W1907/
                    http://s807.photobucket.com/albums/y...m/HP/HP%20W22/

                    Test lamps:
                    http://s807.photobucket.com/albums/y...g%20old%20CFL/

                    Bad lamps:
                    http://s807.photobucket.com/albums/y...klight%20lamp/

                    Example of the suggestion:
                    https://www.badcaps.net/forum/showth...130#post293130
                    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

                    • jetadm123
                      Badcaps Legend
                      • Feb 2010
                      • 2169

                      #50
                      Re: Philips 190S LCD power problem

                      If you think you have a thermal problem, try accelerating the shutdown process using a blow dryer. Heat up various sections of the board to try and isolate the area that causing the shutdown.

                      Comment

                      • picturevalve
                        Member
                        • Nov 2010
                        • 13

                        #51
                        Re: Philips 190S LCD power problem

                        It's 2016, and I've got a dead one of these with the T50P050.00 psu. Found the service manual here :


                        Mosfet 7103 s/c, 15v zener 6105 s/c, resistors 3117, 3154 ,3118, 3155 all high (all originally R51 or 0.51 ohm on my board), all electrolytics high esr except for 1000u 25v caps for some reason but all changed to be sure. Waiting for delivery of first 3 items to, hopefully, complete repair.

                        Comment

                        • picturevalve
                          Member
                          • Nov 2010
                          • 13

                          #52
                          Re: Philips 190S LCD power problem

                          Forgot to say that NCP1203D60 current mode controller (7100) was also u/s.
                          All working again, would have been quicker to pay $20 for a new board.
                          But not so much fun.

                          Comment

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