Troubleshooting Vizio VA370M with bad main board.

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  • HiroP713
    New Member
    • Oct 2012
    • 3
    • USA
    #1

    Troubleshooting Vizio VA370M with bad main board.

    I have a Vizio VA370M which will not power on. When I hit the power button the vizio logo changes from amber to white but nothing else happens. I've already diagnosed this as a bad main board. My boards model number is CBPF9D1KZ5. I tried a CBPF9D1KZ7 board in it and the lcd powered on but had interlacing issues. I had read that some other vizios had issues with bad regultors so I've measured the two regulators I can find on the front of the board and attached a picture. There is one other voltage regulator on the back of the board which I have not checked yet. Any help is appreciated.

    The top regulator has the following markings: L161 903T63
    I was able to find a datasheet for it and it seems to be working properly.

    The bottom regulator has the following markings: 17809 96 59
    I was unable to verify if it is functioning properly.

    Thanks
    Attached Files
    Last edited by HiroP713; 10-29-2012, 02:12 PM.
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: Troubleshooting Vizio VA370M with bad main board.

      Originally posted by HiroP713
      The bottom regulator has the following markings: 17809 96 59
      I was unable to verify if it is functioning properly.
      The above is a 7800 series regulator. More specifically a 7809 with 9 designating the output voltage.
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        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Troubleshooting Vizio VA370M with bad main board.

          "When I hit the power button the vizio logo changes from amber to white but nothing else happens" Is this the symptom of the original board?
          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

            • HiroP713
              New Member
              • Oct 2012
              • 3
              • USA
              #4
              Re: Troubleshooting Vizio VA370M with bad main board.

              Originally posted by budm
              "When I hit the power button the vizio logo changes from amber to white but nothing else happens" Is this the symptom of the original board?
              Yes it is.

                Comment

                • smuddge
                  Senior Member
                  • Feb 2012
                  • 96
                  • Canada
                  #5
                  Re: Troubleshooting Vizio VA370M with bad main board.

                  I know this is an old thread but if anyone else has this problem it is the processor on the mainboard that has cold solder joints. just did a reflow on one here for the heck of it. was just going to throw it out if it didn't work. voila working.
                  yay. saved it from the landfill for now anyways.

                    Comment

                    • Andrew F. Ali
                      Badcaps Legend
                      • Jan 2014
                      • 2450
                      • Trinidad & Tobago
                      #6
                      Re: Troubleshooting Vizio VA370M with bad main board.

                      Originally posted by smuddge
                      I know this is an old thread but if anyone else has this problem it is the processor on the mainboard that has cold solder joints. just did a reflow on one here for the heck of it. was just going to throw it out if it didn't work. voila working.
                      yay. saved it from the landfill for now anyways.
                      Good job!!!

                        Comment

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