Technosonic LCD3251 fault

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  • notallbad
    Badcaps Legend
    • Oct 2012
    • 1183
    • UK
    #1

    Technosonic LCD3251 fault

    Philips PLCD 190 PT3 Power board
    AM0005-BAC Control board
    6870C-0060F T-Con board
    663-2L 0211A Inverter board (right)
    663-2L 0212A Inverter board (left)
    If photos are required I can post them up.

    At first switch on the front panel red led light comes on solid and then flashes 2 times then 5 times.
    The TV comes on but the picture is distorted as per attached picture, sound works fine.
    This is the same on Scart 1, Scart 2 and Antenna In but HDMI and PC Inputs are perfectly fine.
    There is no remote though I don't think this would help anyway other than perhaps to access the Service Menu.
    I can access the OSD Menu from a combination of the front panel buttons and all the functions work.
    The OSD Menu appears perfectly fine.
    The front control buttons operate the volume +/-, channel +/- and power on but not power off.
    The usual visual inspections have been made but no signs of anything obviously faulty, i.e bulging caps, burnt areas, dry joints.



    Uploaded with *************

    Any help would be greatly appreciated. Thank-you.
    Tags: None
    • notallbad
      Badcaps Legend
      • Oct 2012
      • 1183
      • UK
      #2
      Re: Technosonic LCD3251 fault

      I now have an all in one universal remote control and able to access the Service Menu but no obvious options make any difference.

      Also the red blinking when powering up the tv changes, sometimes it might only be 5 and 7 flashes other times it might be 7 then 157.

      I have found a service manual for what appears to be the same tv but branded differently but still need help diagnosing fault.

      Get the same picture on tv as above with S-Vhs input too!
      I feel the fault is going to lay somewhere to do with video signalling, something along the lines of PC and HDMI do not need as much video processing as Scart and Component inputs and so the circuitry dealing with these inputs is somehow not properly processing the signal.
      Perhaps someone could try and run through some checks with me to troubleshoot, I have a DMM, cap meter (out of circuit) and and old oscilloscope but where to put those probes.
      Thanks

        Comment

        • notallbad
          Badcaps Legend
          • Oct 2012
          • 1183
          • UK
          #3
          Re: Technosonic LCD3251 fault

          Looks like my 2 yr old is showing more interest

            Comment

            • notallbad
              Badcaps Legend
              • Oct 2012
              • 1183
              • UK
              #4
              Re: Technosonic LCD3251 fault

              So does anyone know how to 'test'/check a TW9906 Comb filter video decoder and associated clock generator?

                Comment

                • growlley
                  New Member
                  • Dec 2013
                  • 1
                  • wtf
                  #5
                  Re: Technosonic LCD3251 fault

                  Sorry, I cant help your with your problem but can you tell me how to access the service menu Id like to see if there is any options for hdmi as its hit and miss if it will start or throe up a no hdmi signal blue box.

                  thanks

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk
                      #6
                      Re: Technosonic LCD3251 fault

                      hi notallbad cant see any pictures in the link you posted?

                        Comment

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