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Backlight, but no video on Panasonic TC-L39EM60 LCD TV

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    #1

    Backlight, but no video on Panasonic TC-L39EM60 LCD TV

    I'm working on this Panasonic LCD and it's really got me stumped. It'll power on and light up the backlight, but nothing appears on the screen. It isn't locked up, as it can still be powered off by way of the power button, but what I don't know if any sound is playing or not. I tried replacing the mainboard, but ended up with the same problem.

    The power supply is putting out good voltage on all of its rails and reading 4Volts at PWON and 3.3Volts at ACD, DIM, and BLON. Any ideas as to what the problem could be?
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    #2
    Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

    what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds

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      #3
      Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

      Disconnect one ribbon at a time and see if you get picture
      I assume no responsibility for any stupid suggestions I might post.

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        #4
        Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

        Originally posted by vinceroger69 View Post
        what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds
        +1.. What voltage are you getting on each side of the fuse?...Should be 12Vdc.
        Last edited by Andrew F. Ali; 04-18-2017, 02:05 PM.

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          #5
          No video, but 12.9volts on the T CON

          Originally posted by dskall View Post
          Disconnect one ribbon at a time and see if you get picture
          Nothing. At least when disconnecting the ribbons going from the T CON to the panel one-at-a-time.

          Originally posted by vinceroger69 View Post
          what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds
          Originally posted by Andrew F. Ali View Post
          +1.. What voltage are you getting on each side of the fuse?...Should be 12Vdc.
          Strong voltage on both sides of the fuze.

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            #6
            Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

            I would be checking various voltages on t-con
            I assume no responsibility for any stupid suggestions I might post.

            Comment

              #7
              Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

              The five top voltages to be checked for a healthy T-CON are:
              1. Vin (Vcc): 12Vdc or 5Vdc
              2. Vdd (Vlogic, Vddd): 3.3Vdc
              3. Vda (Vs, Vsource, Vdda,Avdd): 14Vdc~20Vdc
              4. Vgh (Vgon, Von, Vddg): 20Vdc~30Vdc
              5. Vgl (Vgoff, Voff, Veeg): -5Vdc~-7Vdc

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                #8
                Fixed!!

                T-CON it was! Everything is in working order now; Thanks for the tips.

                Now, to see about returning that mainboard...

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