Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

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  • organizddisastr
    Member
    • Jan 2012
    • 26
    #1

    Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

    Hey everybody, I was wondering if anyone could help me. I replaced the U33 and U9 chip. During U33 replacement I lost a small resister behind U33 so I simply bridged the resistor. The TV worked fine for about a week and one night while watching a movie the picture became pixelated. It almost looks like a bad youtube video and static. Here are some pictures. The bridged resister the second one to the right of R30. Any ideas or any help would be greatly appreciated. Thanks in advance.
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    • Paul678
      Badcaps Veteran
      • Nov 2011
      • 402
      #2
      Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

      Originally posted by organizddisastr
      Hey everybody, I was wondering if anyone could help me. I replaced the U33 and U9 chip. During U33 replacement I lost a small resister behind U33 so I simply bridged the resistor. The TV worked fine for about a week and one night while watching a movie the picture became pixelated. It almost looks like a bad youtube video and static. Here are some pictures. The bridged resister the second one to the right of R30. Any ideas or any help would be greatly appreciated. Thanks in advance.

      You "bridged" a lost resistor, as in you just shorted it out
      with a piece of wire?

      That's a really BAD idea! Now you have likely ruined another
      portion of the circuit.

      Can you find out what the original value was? And replace it?

        Comment

        • organizddisastr
          Member
          • Jan 2012
          • 26
          #3
          Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

          I simply connected the two points with a small line of solder, bypassing it. I suppose I could read the resistance on the one next to it and try to get one identical to it. Its the size of a flea. (Not easy to solder) I'm a noob at this stuff. A friend gave me the TV for free, so what better way to learn then on something I got for nothing.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

              Originally posted by organizddisastr
              I simply connected the two points with a small line of solder, bypassing it. I suppose I could read the resistance on the one next to it and try to get one identical to it. Its the size of a flea. (Not easy to solder) I'm a noob at this stuff. A friend gave me the TV for free, so what better way to learn then on something I got for nothing.
              Its neighbour is probably a different value. Your best bet is a schematic or someone else with a similar 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

                • Paul678
                  Badcaps Veteran
                  • Nov 2011
                  • 402
                  #5
                  Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

                  Originally posted by organizddisastr
                  I simply connected the two points with a small line of solder, bypassing it. I suppose I could read the resistance on the one next to it and try to get one identical to it. Its the size of a flea. (Not easy to solder) I'm a noob at this stuff. A friend gave me the TV for free, so what better way to learn then on something I got for nothing.
                  Well, just for the future, you shoudn't bypass a resistor with a
                  short, unless you really understand the circuit, and have determined
                  it's safe to do so.

                  Yes, you should try to find a schematic and determine what the
                  original value was. It may be too late for the other parts of the
                  circuit that may have been damaged, but that would be a first step....

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

                      Those 3-pin devices are adjustable voltage regulator, the output voltage is set by the two resistors connected to the left pin of the IC. See LM1117 for example. Why ase they replaced in the first place?
                      Failed TV's and Monitors: http://s807.photobucket.com/albums/yy352/budm/
                      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

                        • PlainBill
                          Badcaps Legend
                          • Feb 2009
                          • 7034
                          • USA
                          #7
                          Re: Vizio GV42LHDTV10A Pixelated Picture Problems After U33 Replacement

                          What is the value of the remaining resistor? Double check this, but I believe U33 usually outputs 3.3 volts. Searching for U33 Vizio on this site will give you the correct voltage. The calculation is Vout = 1.25 x (1 + R1/R2). R1 is the resistor between pin 1 and pin 2, R2 is the resistor between pin 1 and Gnd.

                          PlainBill
                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                            Comment

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