Panasonic tx-55650b

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  • modstation
    New Member
    • Feb 2017
    • 3
    • United Kingdom
    #1

    Panasonic tx-55650b

    Hi
    I have a panasonic tx-55as650b lcd tv which all of a sudden lost its picture, but the backlight was still on. All p/s voltages are good and there is voltage on the output of the t con board. I bought a replacement motherboard and with this one in place there is no backlight the SRV-VLED remains at 24 volts (original m/b switches it to 46v) there is no voltage at srv 12v for t con and the green power led blinks rapidly before going solid. when i remove the ribbon to the panel on one side the other side has vertical lines of various colours which disappear when the ribbon is plugged in. Anyone have any pointers? thanks in advance for any help

    with original m/b in place t con voltages are as follows: v_in 12v
    vdd 0v
    vgh -0.2v
    hvdd 0v
    vcc 3.3v
    vgl -5.1v
    vcore 1.2v
    vep 1.8v
    gclk 1.6v
    mclk 0.1v
    gst 0v
    eo 0v
    gip_bypasson 0v
    vcom top 0v
    vcom bottom 0.1v
    vst -5.1v
    vgh_even -5.1v
    vgh_odd -5.1v
    clk1 through clk6 -5.1v
    Tags: None
    • Moreno83
      Badcaps Legend
      • Jun 2014
      • 2008
      • The Netherlands
      #2
      Re: Panasonic tx-55650b

      So with the original mainboard the tv turns on , has backlight but no picture?

      Does the tv turn on with the replacement board or is it "dead" ? If the backlight stays on then i think you have a problem with the t-con.
      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

        Comment

        • modstation
          New Member
          • Feb 2017
          • 3
          • United Kingdom
          #3
          Re: Panasonic tx-55650b

          i bought a new m/b and a new t con. with the new m/b no backlight and no 12v on the test point between lvds to tcon so i am guessing its no good. with old m/b and new t con no change just backlight. i took off one ribbon to panel and the other side just has vertical lines. when you switch between sources on tv the backlight changes brightness. I have a feeling panel is bad but not sure how to test to find out for sure.

            Comment

            • Moreno83
              Badcaps Legend
              • Jun 2014
              • 2008
              • The Netherlands
              #4
              Re: Panasonic tx-55650b

              Hmm , strange! You sure the new t-con is good?

              Here you can download the service manual.



              Wait for the "processing" on the bottom of the page to disappear. It will change to " get manual ".

              Go to page 21 and do the self check. Hope this helps you.
              I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                Comment

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