e420vse no standby light

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  • kornwood
    Senior Member
    • Jun 2011
    • 93

    #1

    e420vse no standby light

    found one of these at a recycling place I have done some testing on it .it dosent display standby light
    but has 3.3v standby going to mainboard one fuse was bad f2 on mainboard which is 12v power
    on inital plug in no standby power light only have 3.3 coming from power supply pson and on/off have 3.3v also if I press power button the power supply turns on and sends 12v to mainboard but still no light on vizio logo also I dont get 24v to led panel but I do have 3.3 going to it from power supply
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: e420vse no standby light

    Vizio?
    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

    • kornwood
      Senior Member
      • Jun 2011
      • 93

      #3
      Re: e420vse no standby light

      yes sir its a vizio e420vse. led tv
      ill post pics of the boards later

      Comment

      • ecking767
        Badcaps Veteran
        • Oct 2009
        • 492
        • USA

        #4
        Re: e420vse no standby light

        Originally posted by kornwood
        found one of these at a recycling place I have done some testing on it .it dosent display standby light
        but has 3.3v standby going to mainboard one fuse was bad f2 on mainboard which is 12v power
        on inital plug in no standby power light only have 3.3 coming from power supply pson and on/off have 3.3v also if I press power button the power supply turns on and sends 12v to mainboard but still no light on vizio logo also I dont get 24v to led panel but I do have 3.3 going to it from power supply
        I came across 10 of these Vizio E420VSE and all had the same problem, a fail LED driver board, check the LED driver board fuse and goes from there. If the fuse isn't blown then check the IC chip HAI 7207PC to see if it getting too hot to touch when you power on the TV

        Comment

        • kornwood
          Senior Member
          • Jun 2011
          • 93

          #5
          Re: e420vse no standby light

          ill try that shortly and on these newer tvs you can have a symptom that makes you think its one thing but in the end could be something else because every component has to be hooked up and working
          ive also checked all the 1117's that are on the board
          and they all check out good inputs 5ish and discharge is what there marked 33 meaning 3.3 and 12 meaning 1.2 on the chips after 1117
          now ive read that other older model vizios lost there flash in the spi chip could I hook up my blackcat usb
          and dump the flash to verify its there and mot blank and to just have it

          Comment

          • kornwood
            Senior Member
            • Jun 2011
            • 93

            #6
            Re: e420vse no standby light

            ok so that hai chip is hot after a min or two the fuse is good
            theres a short from source to ground on the 2 aod4454
            chips
            Last edited by kornwood; 02-24-2013, 10:15 PM.

            Comment

            • ecking767
              Badcaps Veteran
              • Oct 2009
              • 492
              • USA

              #7
              Re: e420vse no standby light

              Originally posted by kornwood
              ok so that hai chip is hot after a min or two the fuse is good
              Ok, here is the good and bad, the good news is you found the problem with your LED HDTV, the bad news the HAI 7207PC is completely out of stock world-wide. I have been trying for months to get the IC chip and I have not been successful.

              Comment

              • kornwood
                Senior Member
                • Jun 2011
                • 93

                #8
                Re: e420vse no standby light

                ok next question is that chip used in another board
                and thank you

                Comment

                • ecking767
                  Badcaps Veteran
                  • Oct 2009
                  • 492
                  • USA

                  #9
                  Re: e420vse no standby light

                  Originally posted by kornwood
                  ok next question is that chip used in another board
                  and thank you
                  I haven't came across the HAI 7207PC in any other Vizio LED TV, I have three of these E420VSE, I can't fix them until the 7207pc is available. A seller on eBay have a fix but he sold out for now.

                  Comment

                  • kornwood
                    Senior Member
                    • Jun 2011
                    • 93

                    #10
                    Re: e420vse no standby light

                    theres a short from source to ground on the 2 aod4454
                    are we sure these are not the issue
                    and ive contaced a few people about those chips and like you said there are none available
                    the guy on ebay said he will have some in a week or so but who knows but im gonna remove those 2 chips and test them properly

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: e420vse no standby light

                      Source is often grounded on a MOSFET. Not always, it's topology dependent, but often.
                      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

                      • kornwood
                        Senior Member
                        • Jun 2011
                        • 93

                        #12
                        Re: e420vse no standby light

                        ok thanks
                        that one guy on ebay that sells that one thing is that alternate power when the power supply dies or for what we need
                        http://www.ebay.com/itm/vizio-42-e42...item2c6ca32996
                        Last edited by kornwood; 02-25-2013, 02:33 PM.

                        Comment

                        • kornwood
                          Senior Member
                          • Jun 2011
                          • 93

                          #13
                          Re: e420vse no standby light

                          heres a pic of that led board and the bad chip circled
                          Attached Files

                          Comment

                          • kevinm34232
                            Badcaps Legend
                            • May 2012
                            • 1884
                            • USA

                            #14
                            Re: e420vse no standby light

                            So does that ebay board fix the issue?

                            Comment

                            • Mr Bill
                              Badcaps Veteran
                              • Nov 2011
                              • 648
                              • USA

                              #15
                              Re: e420vse no standby light

                              Might be worth sending him a message asking if he is going to continue selling these. If you look at his feedback i think the 2nd or 3rd one down the buyers says it's still working after a week.

                              Comment

                              • kornwood
                                Senior Member
                                • Jun 2011
                                • 93

                                #16
                                Re: e420vse no standby light

                                he said he will have more in a week or so

                                Comment

                                • kornwood
                                  Senior Member
                                  • Jun 2011
                                  • 93

                                  #17
                                  Re: e420vse no standby light

                                  ok with the driver board unplugged 24 volt isnt turned on when the power putton is pushed 12 volt comes on to the mainboard actually even pluged in it isnt there so theres only 3.3 going to driver board

                                  Comment

                                  • skyanchor
                                    New Member
                                    • Dec 2012
                                    • 4
                                    • USA

                                    #18
                                    Re: e420vse no standby light

                                    As far as the $50 eBay board, I sent the guy a couple of messages, and he replied that:
                                    1. "this new power supply is only using the old card to connect to power and the leds the old board is nofuntional", and
                                    2. "yes the the ambient light sensing option will not work with the new power supply."

                                    His power supply looks like it could be identical to one you can buy from China on eBay for $6.50. It looks like he resoldered/reconfigured it slightly so that its height is reduced in order to fit inside the TV:
                                    http://www.ebay.com/itm/1-DC-DC-Boos...item4d05c1bbdc

                                    Comment

                                    • ecking767
                                      Badcaps Veteran
                                      • Oct 2009
                                      • 492
                                      • USA

                                      #19
                                      Re: e420vse no standby light

                                      Originally posted by skyanchor
                                      As far as the $50 eBay board, I sent the guy a couple of messages, and he replied that:
                                      1. "this new power supply is only using the old card to connect to power and the leds the old board is nofuntional", and
                                      2. "yes the the ambient light sensing option will not work with the new power supply."

                                      His power supply looks like it could be identical to one you can buy from China on eBay for $6.50. It looks like he resoldered/reconfigured it slightly so that its height is reduced in order to fit inside the TV:
                                      http://www.ebay.com/itm/1-DC-DC-Boos...item4d05c1bbdc
                                      I have this LED TV on my work bench and there is 83volts on the output where you connect the LEDs, so he had to step-up the output voltage for those LED's to work correctly

                                      Comment

                                      • skyanchor
                                        New Member
                                        • Dec 2012
                                        • 4
                                        • USA

                                        #20
                                        Re: e420vse no standby light

                                        Originally posted by ecking767
                                        I have this LED TV on my work bench and there is 83volts on the output where you connect the LEDs, so he had to step-up the output voltage for those LED's to work correctly
                                        Thanks, that's very useful information. In that case, here's a higher voltage version I found on eBay for $14 with free shipping:

                                        100W DC-DC boost step up converter in 10-32V high voltage out 60-97V

                                        http://www.ebay.com/itm/100W-DC-DC-b...item27c901e470

                                        Comment

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