phillips 42pf9766/79

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  • himinshed
    Member
    • Aug 2013
    • 20
    • australia
    #1

    phillips 42pf9766/79

    The TV is a Phillips 42pf9766/79 Chassis FTP 2.2a aa
    HELLO ALL About a month ago we heard the occasional sharp crack comming from the set i dont realy know if it was comming from the set or though the speakers then one night the sound went off shortly followed by the picture the set went into protection mode .
    Now when i press the start switch i get a blue L.E.D on the front for about 3 seconds then the red led flashes and the set goes into protection mode and shuts down .Onthe PSU THE 3 GREEN leds go on the top2 go off after a short time leaving the bottom one on .The red fault LED on the left hand side of the PSU does not come on . I took the PSU board out of the set and inspected all the Caps ,could not see any distortion or leakage but the transformer with a board id V3T 8005 with a tag KE 0447A had a slight discoloration like it could have been hot at sometime The voltage on the silk screen =VS 175 Volts my board is 9.1
    Vset= 173 Volts my board is 0Volts Vscan=60 Volts my board is 0Volts VCCS =18Volts my board is 132 volts.. The other voltages are as per silk screen .I disconnected xand y main boards and found no change to the voltage at the test pionts Any help with this fault would be greatly appreciated Cheers Shayn
    Tags: None
    • capkid
      Badcaps Legend
      • Oct 2010
      • 1339
      • United States
      #2
      Re: phillips 42pf9766/79

      This might be applicable to your situation: https://www.badcaps.net/forum/showpo...28&postcount=3
      LG Plasma Mal-Discharge Correction Service

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        • capkid
          Badcaps Legend
          • Oct 2010
          • 1339
          • United States
          #3
          Re: phillips 42pf9766/79

          I saw your post in another member's thread, so I decided to respond here so as to not hijack that thread. The closest service manual I could find is this one: http://www.toms-service-manuals.com/...&Search=Submit
          LG Plasma Mal-Discharge Correction Service

            Comment

            • himinshed
              Member
              • Aug 2013
              • 20
              • australia
              #4
              Re: phillips 42pf9766/79

              Hello all i downloaded toms service manual ftp2.4 a-aa but could not find any info on the transformer with a tag of KE 0447A which is the only part on the board i can see with any signs of damage, and that is only slight .i have checked the board with a flashlight ,no swolen or bulged caps arcing or heated components ,APART FROM A slight discouloration on transformer V3T508 .When i disconnect each board in turn i get no change in the voltage reading at the test points on the psu ..With my limited knowledge and not seeing any change in voltage when boards are disconected i think that it must be a p.s.u problem any ideas would be welcome.. Cheers Shayn
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