AKAI 50" plasma tv no picture no sound

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  • bikerbuddy
    Senior Member
    • Jun 2011
    • 134
    • USA
    #1

    AKAI 50" plasma tv no picture no sound

    I have an Akai 50' plasma tv with no picture and no sound , It started about a month ago when one day I try to turn the tv on, it power up with no pic and no sound, but I tried turning it on with the main power switch on the back of the set, some time it will power up with the Akai logo and blue screen for a second or two then the screen will disappear after a few second the akai logo will appear again and disappear and it will repeat it self over and over.
    I opened the back cover and check all the out put voltage , I got 5v , which is stable ,Va 60 v which is stable and Vs 190v which did look to be stable but as I keep checking the all the voltage every now and then I notice that the Vs190
    V was fluctuating from I90v down to 159v and up again , I do not see any bad or bulged caps , I disconnect the Z board and check the voltage still the same
    disconnect the Y board the power drop even lower, when I connect all the boards 5v become stable 60V become but the Va will show 190 v then after a few seconds will start to drop and rise .
    I have three light on , on the ctrl board , some time the d2 light will go off , and comes on back .
    I know the y , Z and Y sustain board are ok ,I am thinking of main board .

    Any and all help is highly appreciated
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: AKAI 50" plasma tv no picture no sound

      Can you post some pics of the board?
      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

        • bikerbuddy
          Senior Member
          • Jun 2011
          • 134
          • USA
          #3
          Re: AKAI 50" plasma tv no picture no sound

          here are a few pic for the AKAi 50" plasma
          Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: AKAI 50" plasma tv no picture no sound

              Can you measure the voltage across the input cap?

              (I'm suspecting either the input mains cap, or the PDP HV caps.)
              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

                • bikerbuddy
                  Senior Member
                  • Jun 2011
                  • 134
                  • USA
                  #5
                  Re: AKAI 50" plasma tv no picture no sound

                  Tom I will check the voltage on the caps first thing in the morning and post it.
                  also I have noticed that one of the diode, #is ST02D-200 (200V 300watts)there is no resistance .
                  thanks

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: AKAI 50" plasma tv no picture no sound

                      Originally posted by bikerbuddy
                      Tom I will check the voltage on the caps first thing in the morning and post it.
                      also I have noticed that one of the diode, #is ST02D-200 (200V 300watts)there is no resistance .
                      thanks
                      No resistance? Zero ohms or open loop? Did you try diode test mode?
                      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

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