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    #1

    Philps LCD TV Some time no back light

    The other night I turn on this TV and all I got was sound turn back off waited about 30 seconds and turn back on and work agian

    Once in a while when you turn this tv it just has one color on the screen if you turn it off and wait 30 second and turn it back on every is ok again

    I begin to think that one or more caps may have a higher than nomal ESR reading

    Do you think that I am right track or is some thing else going on here


    Tags: None
    #2
    Re: Philps LCD TV Some time no back light

    Model number?
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      #3
      Re: Philps LCD TV Some time no back light

      Model # is 42PFL5332D37

      I have to wait to take this TV apart

      unless you think I need to before then

      until I have a desoilering gun which is on back order until 2-20-2012

      heating element when bad in it
      Last edited by sam_sam_sam; 02-03-2012, 08:55 PM.

      Comment

        #4
        Re: Philps LCD TV Some time no back light

        Originally posted by sam_sam_sam View Post
        Model # is 42PFL5332D37
        Is it 42PFL5432D37 by chance? If yes, there are 3 Capxon 1500uF 35V capacitors that are bloated or will bloat. They supply 24V DC to the master and slave inverter.
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        Comment

          #5
          Re: Philps LCD TV Some time no back light

          Model # is 42PFL5332D37 what about this one

          Comment

            #6
            Re: Philps LCD TV Some time no back light

            Philips 42PFL5332D37 and 42PFL5432D37 use two different chassis; the EJ3.0U LA and TPM2.0U LA respectively. The power supplies may or may not be the same.

            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

              #7
              Re: Philps LCD TV Some time no back light

              I guess it time to take apart and check the caps on the power board with an ESR meter

              Thank for your help

              Comment

                #8
                Re: Philps LCD TV Some time no back light

                I found this cross ref



                Attached Files

                Comment

                  #9
                  Re: Philps LCD TV Some time no back light

                  Here are some photo of this TV set


                  Top left photo shows the caps under the heat sinks and how they hook together and some of the caps values

                  All caps under 35 volts are Rubycon except the ones on the inverter boards

                  YXG replaced FC

                  470 uf @ 25 volts ESR reading .03 cap reading 478 uf
                  470 uf @ 25 volts ESR reading .04 cap reading 477 uf
                  470 uf @ 25 volts ESR reading .03 cap reading 477 uf
                  470 uf @ 25 volts ESR reading .05 cap reading 477 uf

                  YXG replaced FC


                  1200 uf @ 35 volts ESR reading .03 cap reading 1056 uf
                  1200 uf @ 35 volts ESR reading .03 cap reading 1059 uf
                  1200 uf @ 35 volts ESR reading .03 cap reading 1040 uf

                  YXG replaced FC


                  1000 uf @ 10 volts ESR reading .04 cap reading 1123 uf
                  1000 uf @ 10 volts ESR reading .04 cap reading 1113 uf
                  1000 uf @ 10 volts ESR reading .04 cap reading 1111 uf

                  YXF replaced FC


                  100 uf @ 35 volts ESR reading .11 cap reading 87 uf
                  100 uf @ 35 volts ESR reading .13 cap reading 87 uf
                  100 uf @ 35 volts ESR reading .11 cap reading 86 uf
                  100 uf @ 35 volts ESR reading .12 cap reading 87 uf

                  YXF replaced FC


                  220 uf @ volts ESR reading .12 cap reading 214 uf

                  Rubycon 85 C FRS

                  100 uf @ 450 ESR reading .91 cap reading 88 uf
                  100 uf @ 450 ESR reading .91 cap reading 88 uf
                  100 uf @ 450 ESR reading .85 cap reading 89 uf
                  100 uf @ 450 ESR reading .95 cap reading 88 uf

                  ____________________________________________________________
                  These cap where on the inverter board brand Samwub LT VOA Pet

                  replaced FR


                  470 uf @ 35 volts ESR reading .03 cap reading 440 uf
                  470 uf @ 35 volts ESR reading .03 cap reading 438 uf
                  470 uf @ 35 volts ESR reading .02 cap reading 436 uf
                  470 uf @ 35 volts ESR reading .02 cap reading 436 uf
                  ____________________________________________________________

                  One thing I notice now that I recap this set when you turn ON the power to the set it take about 5 seconds for the sound to come on an .5 second more for the channel to show on screen then .5 second for the back light to come on to see the picture on the set

                  It use to this when it was new

                  What was happing was that would take 6 to 10 second for sound and picture to come on together

                  The set has been on from 12:00 pm to 7:00 pm and work very good now
                  Attached Files
                  Last edited by sam_sam_sam; 02-11-2012, 06:04 PM.

                  Comment

                    #10
                    Re: Philps LCD TV Some time no back light

                    Replaced with Nichicon LS

                    All four new caps
                    100 uf @ 450 ESR reading .71 cap reading 100 uf



                    Rubycon 85 C FRS

                    100 uf @ 450 ESR reading .91 cap reading 88 uf
                    100 uf @ 450 ESR reading .91 cap reading 88 uf
                    100 uf @ 450 ESR reading .85 cap reading 89 uf
                    100 uf @ 450 ESR reading .95 cap reading 88 uf

                    YXF replaced FC


                    100 uf @ 35 volts ESR reading .11 cap reading 87 uf
                    100 uf @ 35 volts ESR reading .13 cap reading 87 uf
                    100 uf @ 35 volts ESR reading .11 cap reading 86 uf
                    100 uf @ 35 volts ESR reading .12 cap reading 87 uf


                    Dose any one think that these cap listed here could have been causing the problem that i was having wit this TV set

                    Last edited by sam_sam_sam; 02-11-2012, 06:15 PM.

                    Comment

                      #11
                      Re: Philps LCD TV Some time no back light

                      One thing I almost for got to say

                      I found on both the inverter board where the transformer pins go to the board the solider joints look very ? able there was a lot of flux came out from the pins so I re-flow all pin's joints
                      Last edited by sam_sam_sam; 02-11-2012, 09:06 PM.

                      Comment

                        #12
                        Re: Philps LCD TV Some time no back light

                        Originally posted by sam_sam_sam View Post
                        The other night I turn on this TV and all I got was sound turn back off waited about 30 seconds and turn back on and work again

                        Once in a while when you turn this TV it just has one color on the screen if you turn it off and wait 30 second and turn it back on every is OK again
                        Up-Date

                        From the time I recap this set until now

                        This set come on every time I turn it on

                        On another note about a year ago just before I found this forum which by the way where I have learn alot
                        I found a 42 " LCD TV set in the trash pile at the street when I open it I found two caps that pop there tops replaced both of them and it still works very good today

                        I want to thank all of the people on this forum that day in and day out help people like me Thank You
                        Last edited by sam_sam_sam; 05-13-2012, 08:51 AM.

                        Comment

                          #13
                          Re: Philps LCD TV Some time no back light

                          Up-Date to this repair of this Model # is 42PFL5332D37

                          I still have the same problem

                          The sound come ON but the back lights do not come ON if you turn the set off for 30 seconds and turn it back ON it works the way it should this happen about a two month ago then about a week ago or so the same thing happen again

                          Dose any one have any idea what is going on with this set

                          Last edited by sam_sam_sam; 11-12-2012, 07:28 PM.

                          Comment

                            #14
                            Re: Philps LCD TV Some time no back light

                            Dose anyone have any idea what is happening to this set

                            Comment

                              #15
                              Re: Philps LCD TV Some time no back light

                              check the voltage to the inverter board. when the backlight is off , is there voltage (most of time 24 volt)? check if there is a 'inverter on signal' (inv_on). maybe there is a bad ccfl lamp.

                              Comment

                                #16
                                Re: Philps LCD TV Some time no back light

                                I see the list of caps, so the caps on the Master and Slave boards are replaced? DO AS anno suggested to see if you have those two signals when you do not have backlights.
                                Post closed up pictures of the inverter boards if you are not sure which pins to use for tesing.
                                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

                                  #17
                                  Re: Philps LCD TV Some time no back light

                                  Thanks for the info

                                  Comment

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