Vizio V042L No Picture has backlights.

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  • philliesfan30m
    Badcaps Veteran
    • Aug 2013
    • 542
    • USA

    #61
    Re: Vizio V042L No Picture has backlights.

    i have checked out the controller chip and i don't see any signs of burning. now i just have to wait for the mosfets to get here and i'll post back if that fixed the problem. thanks for all the help tom it is greatly appreciated i have another tv with a problem but i am gonna start a new thread it turns on then shuts off after a few seconds and goes into standby mode thanks for the help

    Comment

    • philliesfan30m
      Badcaps Veteran
      • Aug 2013
      • 542
      • USA

      #62
      Re: Vizio V042L No Picture has backlights.

      is there a special way to get off q7,8,9, and 10 they are mosfets but they are attached to the board not a heatsink any good tricks to get them off? i'm having a heck of a time! i got the 2 pins on everyone disconnected but the back i can't get loose from the board any help appreciated

      Comment

      • philliesfan30m
        Badcaps Veteran
        • Aug 2013
        • 542
        • USA

        #63
        Re: Vizio V042L No Picture has backlights.

        nevermind i didn't realize they needed so much heat

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #64
          Re: Vizio V042L No Picture has backlights.

          I cut off the two legs, then use Flux and ADD more solder to retain heat, also high Wattage iron ~60W should be used.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • philliesfan30m
            Badcaps Veteran
            • Aug 2013
            • 542
            • USA

            #65
            Re: Vizio V042L No Picture has backlights.

            i replaced the 4 mosfets on the inverter board but i still don't get a picture the t-con board come one when i first turn it on the goes out after a few seconds. i have all the correct voltage at the inverter board. all the mosfets i replaced read 10 except 1 which reads 9 with the dmm on 2000k. i read somewhere they are suppose to read 8.5k is that true? i ordered the ones that are 8.5k on the datasheet. why is the t-con board turning off though?

            Comment

            • philliesfan30m
              Badcaps Veteran
              • Aug 2013
              • 542
              • USA

              #66
              Re: Vizio V042L No Picture has backlights.

              thats a good idea for removal i will take note of that for future reference. i checked the capacitance of the 3 samwha caps on the inverter board and they all 3 read around 2400 but the are only rated at 680uf should i try that as the next solution? and i saw many people going up in voltage and up in uf higher than what they were using but how high is ok or should i just replace with the same exact?

              Comment

              • philliesfan30m
                Badcaps Veteran
                • Aug 2013
                • 542
                • USA

                #67
                Re: Vizio V042L No Picture has backlights.

                i hear they are crap caps anyways they are 35v 680uf caps on it now. what is anyones input?

                Comment

                • capkid
                  Badcaps Legend
                  • Oct 2010
                  • 1339
                  • United States

                  #68
                  Re: Vizio V042L No Picture has backlights.

                  Originally posted by philliesfan30m
                  thats a good idea for removal i will take note of that for future reference. i checked the capacitance of the 3 samwha caps on the inverter board and they all 3 read around 2400 but the are only rated at 680uf should i try that as the next solution? and i saw many people going up in voltage and up in uf higher than what they were using but how high is ok or should i just replace with the same exact?
                  Did you test those caps out of the circuit? I'd de-solder at least one lead of each cap to make sure your readings are accurate. They might be fine. Space might be an issue, so you may not be able to go up much beyond the 35V. Since they're Samwha caps, I'd probably replace them anyway. Bud may have a different take or reasoning, but you normally want to keep the capacitance the same.
                  Last edited by capkid; 09-09-2013, 01:13 AM.
                  LG Plasma Mal-Discharge Correction Service

                  Comment

                  • philliesfan30m
                    Badcaps Veteran
                    • Aug 2013
                    • 542
                    • USA

                    #69
                    Re: Vizio V042L No Picture has backlights.

                    yeah space is a problem because they are laying down on the board. but do you tink they could be the cause of my not having any backlight? or do you think it is the backlight driver that everyone else seemed to have a problem with on the tv. i will take 1 out and check it.thanks for the reply

                    Comment

                    • philliesfan30m
                      Badcaps Veteran
                      • Aug 2013
                      • 542
                      • USA

                      #70
                      Re: Vizio V042L No Picture has backlights.

                      checked the caps out of circuit and they are good so i guess i has to be that backlight driver. if the inverter isn't working proplerly will that make the t-con shut down?

                      Comment

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