whalfdale lcd help

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  • cossiejay
    Senior Member
    • Nov 2010
    • 83

    #1

    whalfdale lcd help

    hi all I have just bought a whalfdale lcd sorry I do not know model number but my problem is when turned on the screen flashs and the set goes into stand by It does this everytime I have had the back off and no blown caps I have unplugged the invertor board and the set will power up and apart from the lack of light it does not turn off as soon as the invertor board is connected it shuts off could someone tell me if it is the power board or invertor board it is a uk model 240 volts thanks
  • vinceroger69
    Badcaps Legend
    • Mar 2012
    • 6714
    • uk

    #2
    Re: whalfdale lcd help

    can you upload good clear pictures of the boards in your tv so we can see what were dealing with what the part numbers from the power supply board.

    Comment

    • cossiejay
      Senior Member
      • Nov 2010
      • 83

      #3
      Re: whalfdale lcd help

      I will upload some tomorrow the power board is a 17pw20 v2 and inverto board is 4h.v1838.461/b it will power up until I plug in the back lights once I plug just on in it goes back into stand by

      Comment

      • vinceroger69
        Badcaps Legend
        • Mar 2012
        • 6714
        • uk

        #4
        Re: whalfdale lcd help

        have you tested the psu voltages? do they also drop out when the backlight fails?

        Comment

        • Clydeuk
          Senior Member
          • Jan 2012
          • 193

          #5
          Re: whalfdale lcd help

          The 17PW20 has a few common problems that should be dealt with before looking any further, there is a cheap kit of parts available for this which might be the best option for sake of reliability. You may find this solves the problem.

          Comment

          • cossiejay
            Senior Member
            • Nov 2010
            • 83

            #6
            Re: whalfdale lcd help

            all voltages are fine until I plug in the ccfl

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: whalfdale lcd help

              Can you supply us with the requested pictures
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • multimeter
                Badcaps Veteran
                • Jan 2011
                • 739
                • united kingdom

                #8
                Re: whalfdale lcd help

                ughh,argos badge

                ,last one of these i did with the same symptoms was a ccfl with burnt end arcing against the supply wire,thus causing 2 secs to black issue,and shutting down the inverter
                fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                ----------------------------------------------
                please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                Comment

                • cossiejay
                  Senior Member
                  • Nov 2010
                  • 83

                  #9
                  Re: whalfdale lcd help

                  pictures of power and invertor

                  Attached Files

                  Comment

                  • cossiejay
                    Senior Member
                    • Nov 2010
                    • 83

                    #10
                    Re: whalfdale lcd help

                    replaced most caps and I have notices a humming sound coming from somewhere but cant seem to pinpoint it

                    Comment

                    • cossiejay
                      Senior Member
                      • Nov 2010
                      • 83

                      #11
                      Re: whalfdale lcd help

                      now checked all ccfl with a battery and they apper fine

                      Comment

                      • selldoor
                        Slow Learner
                        • Dec 2010
                        • 7870

                        #12
                        Re: whalfdale lcd help

                        Originally posted by cossiejay
                        now checked all ccfl with a battery and they apper fine
                        What ? how did you do that?
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                        • cossiejay
                          Senior Member
                          • Nov 2010
                          • 83

                          #13
                          Re: whalfdale lcd help

                          got it fixed now thanks for all the help you gave lol

                          Comment

                          • Clydeuk
                            Senior Member
                            • Jan 2012
                            • 193

                            #14
                            Re: whalfdale lcd help

                            care to inform us what fixed the tv?

                            Comment

                            • cossiejay
                              Senior Member
                              • Nov 2010
                              • 83

                              #15
                              Re: whalfdale lcd help

                              yes a new power board it saved all the messing around and only £15 off ebay

                              Comment

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