Vizio E470i no power

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  • AcGeorgiegirl
    Badcaps Veteran
    • Jun 2013
    • 202
    • USA

    #1

    Vizio E470i no power

    Hi everyone,
    I've replaced the power supply board to no avail. Here's what it's doing...It sometimes will give a blue(standby?) light, but this light quickly fades to nothing(weird??!!). I've checked the pins on the connector...standby is at a bit over 5v, blu is 0(after the multimeter cycles down in numbers), and pwm1 and pwm2 are both at 0.96. The pson is also at 0 after cycling down. I haven't tried testing the main side yet, because I really don't know where to start. i've never tested diodes and bridges and whatever other thingys I keep hearing about, but I will give it a try. My multimeter doesn't give esr values, unfortunately, to start testing the caps. I didn't think caps would be the first priority?
    Attached Files
  • Hamie
    Badcaps Legend
    • Apr 2014
    • 1383
    • UK

    #2
    Re: Vizio E470i no power

    Disconnect the main board,

    Jump ps-on to 5v
    And also bl-on to 5v

    All voltages should now be present and the back light should turn on.

    Comment

    • AcGeorgiegirl
      Badcaps Veteran
      • Jun 2013
      • 202
      • USA

      #3
      Re: Vizio E470i no power

      Ok. I don't know what you guys mean by "jump", sorry I'm sure I can do it, but could you give me an idea of what you mean? Thanks!

      Comment

      • Terryfictv
        Senior Member
        • Mar 2011
        • 124
        • USA

        #4
        Re: Vizio E470i no power

        Put a straight pin in the connector with the wire at bl-on,
        sb5v and ps-on then use alligator clip leads to hook them
        together.....HTH

        Comment

        • Hamie
          Badcaps Legend
          • Apr 2014
          • 1383
          • UK

          #5
          Re: Vizio E470i no power

          Originally posted by AcGeorgiegirl
          Ok. I don't know what you guys mean by "jump", sorry I'm sure I can do it, but could you give me an idea of what you mean? Thanks!

          No probs,

          Disconnect the wire going to main board,

          Then with a piece of wire, paper clip etc, you need to connect ps-on to the 5v line. And also bl-on to 5v

          Kinda like this,

          Comment

          • AcGeorgiegirl
            Badcaps Veteran
            • Jun 2013
            • 202
            • USA

            #6
            Re: Vizio E470i no power

            Thanks for the 'splainin, guys! Ok. So I did the jumpering for both ps-on and bl-on with no change/nothing happened. I also got a little different readings for the various pins using a smaller wire attached to my DMM. The standby's were exactly the same. The pwm's were at 1.82, the 12v's were at .17.

            Comment

            • AcGeorgiegirl
              Badcaps Veteran
              • Jun 2013
              • 202
              • USA

              #7
              Re: Vizio E470i no power

              I now have connected a 2nd power supply I'd bought, did the jumpering, and still got nothing. I then tested the pins as before, and got these: standby's are same(5.26), pwm's are 1.77 and 12v's are 0.14. Something else...the previous power supply didn't get me a blue "on" light, but this one does. Just to remind you..the blue light comes on, then fades to nothing within 5 seconds. It won't come on when I press and hold the power button more than 2 seconds.

              Comment

              • CapLeaker
                Leaking Member
                • Dec 2014
                • 7992
                • Canada

                #8
                Re: Vizio E470i no power

                With the power supply mounted and hooked up, measure every pin to GND. Use the pin out and the volts you measured.

                Comment

                • AcGeorgiegirl
                  Badcaps Veteran
                  • Jun 2013
                  • 202
                  • USA

                  #9
                  Re: Vizio E470i no power

                  Originally posted by CapLeaker
                  With the power supply mounted and hooked up, measure every pin to GND. Use the pin out and the volts you measured.
                  ok, so "hooked up" = main board connected...or plugged into power supply?
                  Please give me details of how to measure pins to GND. Would I use black probe to a GND pin and red one to each of the previous pins I've mentioned(ps-on, pwm's, 12v's, and BLU? "use pin out"?

                  Comment

                  • AcGeorgiegirl
                    Badcaps Veteran
                    • Jun 2013
                    • 202
                    • USA

                    #10
                    Re: Vizio E470i no power

                    Guys, I'm wondering about this...If the pwr supply isn't connected to the main, and the only other connection to the tv is (what I am assuming) being the backlight panel, how would the ps-on get it's switch, considering the pwr supply isn't talking to the main. I understand that by jumpering v's to the ps-on and blu, I'm giving it a "direct switch" of power, but I get lost as far as how the pwr supply can then tell the main to turn the power on. I guess the other issue is that the psb didn't do its job in turning on the backlight, which is connected, anyway. Here's a pic of the layout, which might help you "get" why I'm confused about the switching issue.
                    Attached Files

                    Comment

                    • Andrew F. Ali
                      Badcaps Legend
                      • Jan 2014
                      • 2450
                      • Trinidad & Tobago

                      #11
                      Re: Vizio E470i no power

                      Originally posted by AcGeorgiegirl
                      ok, so "hooked up" = main board connected...or plugged into power supply?
                      Please give me details of how to measure pins to GND. Would I use black probe to a GND pin and red one to each of the previous pins I've mentioned(ps-on, pwm's, 12v's, and BLU? "use pin out"?
                      Use this as an example:
                      Pin 1 ps-on 3.15Vdc
                      Pin 2 BLU 3.65Vdc
                      Pin 3 12V 0Vdc
                      Pin 4 Stby 5Vdc
                      etc
                      etc

                      Note: Your DMM should be set on the 20V DC Scale. The BLACK probe must be attached to the bare metal frame and the RED probe carefully placed on the pins.
                      Hope this helps.

                      Comment

                      • newtothis
                        Badcaps Legend
                        • Mar 2013
                        • 1556
                        • england

                        #12
                        Re: Vizio E470i no power

                        Ok What happens is the 5v STBY is routed to the mainboard... When the mainboard is switched on it send voltage to the PS-ON pin of the PSU allowing the other voltages to rise.

                        So first thing is we should be telling you to use a resistor to jumper the pins not just a wire. So get a ~500ohm resistor and connect it from 5v STBY to PS-ON and measure voltages with Red to pin and Black to the chassis (Ground)

                        List the Pin name and readings like this :

                        Pin 1 - 5V STBY - 5v
                        Pin 2 - PS_ON - 5v
                        Pin 3 - 12v - 12v

                        etc etc

                        Make sure you are using VDC on your meter and not VAC, If your meter is old make sure your battery is good too.

                        Comment

                        • AcGeorgiegirl
                          Badcaps Veteran
                          • Jun 2013
                          • 202
                          • USA

                          #13
                          Re: Vizio E470i no power

                          Got it, thanks! I've been searching for a resistor with no success, among my graveyard of tv's to fix in my den! I know what they look like, but don't know how to determine ohm values except by their colored bands. I've been looking for either a 4 or 5-banded R. 4's with colors green, brown, brown, gold. 5's with green, brown, brown, black, red. Is this correct?

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Vizio E470i no power

                            Resistor codes:
                            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

                            • Andrew F. Ali
                              Badcaps Legend
                              • Jan 2014
                              • 2450
                              • Trinidad & Tobago

                              #15
                              Re: Vizio E470i no power

                              OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
                              On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.

                              Comment

                              • AcGeorgiegirl
                                Badcaps Veteran
                                • Jun 2013
                                • 202
                                • USA

                                #16
                                Re: Vizio E470i no power

                                Originally posted by newtothis
                                Ok What happens is the 5v STBY is routed to the mainboard... When the mainboard is switched on it send voltage to the PS-ON pin of the PSU allowing the other voltages to rise.

                                So first thing is we should be telling you to use a resistor to jumper the pins not just a wire. So get a ~500ohm resistor and connect it from 5v STBY to PS-ON and measure voltages with Red to pin and Black to the chassis (Ground)

                                List the Pin name and readings like this :

                                Pin 1 - 5V STBY - 5v
                                Pin 2 - PS_ON - 5v
                                Pin 3 - 12v - 12v

                                etc etc

                                Make sure you are using VDC on your meter and not VAC, If your meter is old make sure your battery is good too.
                                I got this started, but made a goof somehow, because a cap blew the second I touched the red probe to the 5vdc pin! I also found a blackened area nearby the cap, so I'm assuming I did some damage somewhere along the cap's trace? The cap is a 47uf 50v. That's the first time I've had this mishap, and it gave me a "come to Jesus" moment, as we say here in the South. Just to clarify, I was supposed to test dcv while the ps-on pin was jumpered over to the 5vdc, correct? I'm wondering if how I connected ac would have mattered? I used the tv's cord, which is only a 2-prong, but connected it using my 3-prong extension cord.
                                Attached Files
                                Last edited by AcGeorgiegirl; 05-25-2015, 04:39 PM. Reason: Didn't included pictures needed.

                                Comment

                                • AcGeorgiegirl
                                  Badcaps Veteran
                                  • Jun 2013
                                  • 202
                                  • USA

                                  #17
                                  Re: Vizio E470i no power

                                  Originally posted by Andrew F. Ali
                                  OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
                                  On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.
                                  I didn't get to test the p701 pins, yet, due to my mishap with the cs201 pins, but I'm also not finding this jack on the board at all. Only other connector is the CN301 with pins for vout and led.

                                  Comment

                                  • newtothis
                                    Badcaps Legend
                                    • Mar 2013
                                    • 1556
                                    • england

                                    #18
                                    Re: Vizio E470i no power

                                    Ok pics are very unfocused TBH.

                                    That's a SOT23 package transistor that's blown by the looks of it.

                                    Can you give us the part number off the PSU please as may need to find a schematic

                                    Comment

                                    • AcGeorgiegirl
                                      Badcaps Veteran
                                      • Jun 2013
                                      • 202
                                      • USA

                                      #19
                                      Re: Vizio E470i no power

                                      Originally posted by newtothis
                                      Ok pics are very unfocused TBH.

                                      That's a SOT23 package transistor that's blown by the looks of it.

                                      Can you give us the part number off the PSU please as may need to find a schematic
                                      PN: 00500-0614-0270
                                      *fyi, I'm confused about the pic's...they are huge, but clearly focused when I click their links

                                      Comment

                                      • AcGeorgiegirl
                                        Badcaps Veteran
                                        • Jun 2013
                                        • 202
                                        • USA

                                        #20
                                        Re: Vizio E470i no power

                                        Any luck getting the schematics? I've looked everywhere I can think of. I failed to mention that when I blew the cap, the resistor I found to use was a 1k ohm, as pictured. I couldn't get a macro shot close enough to see the color bands for you guys, sorry.

                                        Comment

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