Philips 42pfl3606 efforts on repairing the psu

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  • senndogg
    Badcaps Veteran
    • Dec 2011
    • 383
    • Albania
    #1

    Philips 42pfl3606 efforts on repairing the psu

    Hello. Its been almost a month waiting for several pieces to come from ebay, several reworks made, and now i am at the point of giving up. But before i do, i need your honest opinions.
    This LCD Tv was stricken by a lightning and was totally dead when came.
    Main fuse blown.
    Checked for short in the main capacitor, OK. replaced fuse and blown again. Rectifier faulty. Changed it and the fuse.
    TV led was lit. 5V standby was ok.
    PS_ON 3.3V but no 12/24V.
    After many measurements decided to order the IC controller of this rail.
    Replaced the IC and the mosfet. 12 and 24V now are OK.
    TV working without backlight. Examined the 24pin IC of the backlight and found many shorts. Found also some traces of possible arc-ing between smd components (last pic).
    I am ready to order this IC, but now i am very pessimistic.
    I need some opinions.
    Thank you.
    Attached Files
    Tags: None
    • senndogg
      Badcaps Veteran
      • Dec 2011
      • 383
      • Albania
      #2
      Re: Philips 42pfl3606 efforts on repairing the psu

      UPDATE!
      happy to tell that: took the backlight IC from a similar lcd-faulty philips in my workshop and now it is working !!!
      Thank you for the time!

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870
          #3
          Re: Philips 42pfl3606 efforts on repairing the psu

          Good fix - your too quick I looked at your post briefly but was tired and thought Ill look at that tomorrow and here I am - too late.
          Did you resolder those joints as well?
          Last edited by selldoor; 08-08-2014, 05:30 AM.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • senndogg
              Badcaps Veteran
              • Dec 2011
              • 383
              • Albania
              #4
              Re: Philips 42pfl3606 efforts on repairing the psu

              yes, i restored the cut traces, resoldered and cleaned everything. Now its been nearly 2 hours the Tv is working well.

                Comment

                • Ltank
                  Badcaps Veteran
                  • Jun 2013
                  • 776
                  • USA
                  #5
                  Re: Philips 42pfl3606 efforts on repairing the psu

                  What was the IC# and actual part number for others to reference to?
                  Thanks

                    Comment

                    • senndogg
                      Badcaps Veteran
                      • Dec 2011
                      • 383
                      • Albania
                      #6
                      Re: Philips 42pfl3606 efforts on repairing the psu

                      The backlight IC801 is a UBA2071AT from NXP.
                      The 12/24V controller is a NCP1271A from OnSemi.
                      The 12/24V original mosfet which i dont remember, was changed with a Toshiba 2SK2797.
                      The last 2 are bought from a well known HongKong supplier and came in 8 days.
                      Anyway this scenario was provoked by a lightning, i have barely seen 24pin BL ships failing.

                        Comment

                        • bangy
                          New Member
                          • Mar 2016
                          • 1
                          • Serbia
                          #7
                          Re: Philips 42pfl3606 efforts on repairing the psu

                          Hi,i got almost same problem but i got only +5v everything seems good ,caps ok.
                          No 12v and 24v. Tv works fine 2,3 days and after that dont work few days...
                          Anybody can help me or advice

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales
                              #8
                              Re: Philips 42pfl3606 efforts on repairing the psu

                              Is this the service manual


                              https://cdn.badcaps-static.com/pdfs/...e8f6774242.pdf

                              If your power supply matches the one shown in section 10.2 - PSU Thriller 42" - then disconnect the power supply from the main board and short pins 10 & 11 on CN903 and check for 24V and 12V using your multimeter.
                              Last edited by dick_barton; 03-15-2016, 05:56 PM.
                              Willing to help but I'm no expert.

                                Comment

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