vizio vl370m dead

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  • gaplayer31805
    Member
    • Oct 2010
    • 15
    #1

    vizio vl370m dead

    vizio vl370M dead. No power light, no standby light nothing.
    Ordered power supply board from discounttvparts. didn't help
    I ordered board because I found a couple transistors shorted
    and figured for 28.00 it would be easy enough not to repair board.
    took readings on both boards with power applied and got 5.27 volts
    on the three pinsmarked +5VSB, nothing on any of the other pins, three
    pins are marked 12V, and 1 pin marked ps_on, pins 4 thru 8 are marked
    sgnd. the ps board number is dps-201dp-1. the smaller pin outplug
    is marked ACO, lamp_status, DCR,VBRA, on/off_inverter, dim. which have no voltage at all on anyy pins. Any ideas, I have no schematic for this set
    did i get a defective ps, or is the main logic board gone bad?
    Tags: None
    • Dgtech
      E. Technician
      • Apr 2009
      • 1462
      • Steeler
      #2
      Re: vizio vl370m dead

      Post some pictures of the set opened up. Pictures are our friends. Please use the "manage attatchments" on the post page instead of inline pictures.
      The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

        Comment

        • gaplayer31805
          Member
          • Oct 2010
          • 15
          #3
          Re: vizio vl370m dead

          Here are some pics of set inside as requested. After several tries, these are the clearest pics, I was using a blackberry, on the pinouts on the power board starting from the left on the large one is 3 - 5v, then sgnd from pin 4 to 8 , then you have 3 - 12v, and the last one is ps_on. On the small connector labels are from left to right ACD, Lamp_Status, DCR, VBRA, On/Off_Inverter, DIM. Numbers on both connectors go from right to left, IE. DIM is pin one, and PS_ON is pin one. The only voltage I get is 5.18 with the old board in place, and 5.27 with the board I just ordered, on pin 10, 11, 12 on the larger connector. No other pins show any voltage. Used magnifying looking glass to view both boards, no evident damaged components. This set was turned off one evening, the next day nothing. Voltage readings taken with a Fluke Digital Voltmeter.
          Attached Files
          Last edited by gaplayer31805; 10-29-2010, 04:19 AM.

            Comment

            • truep
              Badcaps Veteran
              • Aug 2010
              • 373
              • USA
              #4
              Re: vizio vl370m dead

              Did you check the 5V on the old board? I had one that had 24V on the 5V due to a shorted transistor. I had to replace the main board, the pushbutton board and the infra-red board (for the remote. as well as the power supply. Then it worked fine except the power/standby light wouldn't come on. Couldn't find one.
              Phil

                Comment

                • truep
                  Badcaps Veteran
                  • Aug 2010
                  • 373
                  • USA
                  #5
                  Re: vizio vl370m dead

                  bty, The power board must be connected to get anything other than 5v.

                    Comment

                    • gaplayer31805
                      Member
                      • Oct 2010
                      • 15
                      #6
                      Re: vizio vl370m dead

                      I have checked both boards, the old board had 5.18 volts on all three 5v pins, and the new board has 5.27 on all three pins. I ordered a new main board yesterday. 0171-2271-2855 is the number on the main board. The pushbuttons are part of the main board on this unit.
                      Last edited by gaplayer31805; 11-02-2010, 04:38 AM.

                        Comment

                        • Dgtech
                          E. Technician
                          • Apr 2009
                          • 1462
                          • Steeler
                          #7
                          Re: vizio vl370m dead

                          Who did you buy the PS board from? I hope not ebay.

                          Do me a quick favor. Measure the 5VDC on the ac setting. If you have a meter that says mVAC, this is the best setting for measuring ripple that could be on the 5V line.
                          The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                            Comment

                            • gaplayer31805
                              Member
                              • Oct 2010
                              • 15
                              #8
                              Re: vizio vl370m dead

                              Hmm was just told 10 minutes ago this set was hit by lightening, so no telling what i will run into. will see what I have when the board comes in. Checked no ripple in the 5 v

                                Comment

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