vizio

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • markmac3
    Member
    • Sep 2017
    • 22
    • USA

    #21
    Re: vizio

    Originally posted by budm
    Right now Op has no PS-ON so there will be no 12V to test.
    12vdc testing: disconnect the 12vdc TV load from the power supply board and attach one #1157 (using
    just the Hi filament), the 12vdc output should stay at 12v (+/-1v), if not, the power supply has regulation
    problem.

    i unplugged the t-con board from main board, hooked up the 1157 bulb to 12v pin next to ps_on. pushed power button , no light. is this right?

    Comment

    • markmac3
      Member
      • Sep 2017
      • 22
      • USA

      #22
      Re: vizio

      I just tried this. I found one of the voltage reg that had 3.3v and jumped it to the ps_on. light came on, had 12v.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: vizio

        As I indicated, your main board is not sending the PS-ON to turn on the power supply, so you need to find out why it is not sending the PC-ON. You can start by testing all 3 legs of all the Voltage regulator on the main board.
        BTW, jumping the PS-ON directly to the power source with out using current limiter resistor is not good idea, especially if you did remove the PS-ON wire going back to the main board first which you can damage the switched Transistor that controls the PS-ON signal line.
        You should also use low beam of the 1157 so you will reduce the inrush current, if you check the cold resistance of the 1157 filaments, you will find that it has very low cold resistance that can easily overload the power supply or damage it. You can easily calculate what the inrush current will be using Ohms law.
        Last edited by budm; 09-07-2017, 07:37 PM.
        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

        • markmac3
          Member
          • Sep 2017
          • 22
          • USA

          #24
          Re: vizio

          Originally posted by budm
          As I indicated, your main board is not sending the PS-ON to turn on the power supply, so you need to find out why it is not sending the PC-ON. You can start by testing all 3 legs of all the Voltage regulator on the main board.
          BTW, jumping the PS-ON directly to the power source with out using current limiter resistor is not good idea, especially if you did remove the PS-ON wire going back to the main board first which you can damage the switched Transistor that controls the PS-ON signal line.
          You should also use low beam of the 1157 so you will reduce the inrush current, if you check the cold resistance of the 1157 filaments, you will find that it has very low cold resistance that can easily overload the power supply or damage it. You can easily calculate what the inrush current will be using Ohms law.
          this was all the voltage regulators I saw on main board and there readings
          u11 no voltage on any leg
          u9 in 4.9 out 2.5 gr 1.2
          u8 in 2.5 out 1.2 adj 0
          u2 in 4.9 out 3.3 gr 2.0
          u5 in 4.9 out 2.6 gr 1.3
          and the ps_on wire was still on when I tried the jump.
          Last edited by markmac3; 09-07-2017, 08:19 PM.

          Comment

          • markmac3
            Member
            • Sep 2017
            • 22
            • USA

            #25
            Re: vizio

            Originally posted by budm
            As I indicated, your main board is not sending the PS-ON to turn on the power supply, so you need to find out why it is not sending the PC-ON. You can start by testing all 3 legs of all the Voltage regulator on the main board.
            BTW, jumping the PS-ON directly to the power source with out using current limiter resistor is not good idea, especially if you did remove the PS-ON wire going back to the main board first which you can damage the switched Transistor that controls the PS-ON signal line.
            You should also use low beam of the 1157 so you will reduce the inrush current, if you check the cold resistance of the 1157 filaments, you will find that it has very low cold resistance that can easily overload the power supply or damage it. You can easily calculate what the inrush current will be using Ohms law.
            I found a total of 7 voltage regulators on main board. 6 had the 1.25v between adjust pin and center pin and the correct voltages on the output (+1.25v). the one that did not read any voltage is different(bigger) than the others. theres 5- 1117, 1- 7805 and 1- 1084. the 7805 did not read any voltage on any pins. the other day when I jumped the ps_on,(and have not done that again) I did have voltage on that regulator, 12v in 4.9 out is what I remember. what would be my next step?

            Comment

            • markmac3
              Member
              • Sep 2017
              • 22
              • USA

              #26
              Re: vizio

              I saw the post from retiredcaps on how to display my readings from voltage regulators. I hope this is correct. all look good except U11. is it bad? also cant find datasheet for U9, I cant get a clear picture to show but the only other markings a what looks like a backwards C with 2 dashed lines vertically through the C and 2 vertical dashed lines to the right of the C.

              U11
              7805CT
              AMK 805G
              pin 1= 0v
              pin 2= 0v
              pin 3= .270

              U4
              AMC1117
              F0838G
              pin1 = 2.076
              pin2 = 3.336
              pin3 = 4.960

              U9
              1084
              0810EL
              pin 1 = 1.256
              pin 2 = 2.508
              pin 3 = 4.917

              U8
              AMC1117
              F0838G
              pin 1 = 0
              pin 2 = 1.261
              pin 3 = 2.508

              U2
              AMC1117
              F0838G
              pin 1 = 2.050
              pin 2 = 3.307
              pin 3 = 4.916

              U5
              AMC1117
              F0838G
              pin 1 = 1.383
              pin 2 = 2.647
              pin 3 = 4.905

              U7
              AMC1117
              F0838G
              pin 1 = 2.082
              pin 2 = 3.341
              pin 3 = 4.919
              Last edited by markmac3; 09-09-2017, 05:11 PM.

              Comment

              • attainteddragon
                Badcaps Veteran
                • Apr 2013
                • 764
                • australia

                #27
                Re: vizio

                your vr's are good. you can not consider u11 bad as it does not receive any voltage.
                WHY CAN'T PHILIPS USE PHILLIPS HEAD SCREWS?

                Comment

                • markmac3
                  Member
                  • Sep 2017
                  • 22
                  • USA

                  #28
                  Re: vizio

                  Originally posted by attainteddragon
                  your vr's are good. you can not consider u11 bad as it does not receive any voltage.
                  What would be my next step, kinda stuck on what to check.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #29
                    Re: vizio

                    So right now we are dealing with the original boards. What do you get as far as the Voltages and the PS-ON if you install the replacement main board you bought?
                    BTW on post #17, you indicate of having 3.3V at the power switch, but does it change state when the power switch is activated?
                    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

                    • markmac3
                      Member
                      • Sep 2017
                      • 22
                      • USA

                      #30
                      Re: vizio

                      Originally posted by budm
                      So right now we are dealing with the original boards. What do you get as far as the Voltages and the PS-ON if you install the replacement main board you bought?
                      BTW on post #17, you indicate of having 3.3V at the power switch, but does it change state when the power switch is activated?
                      the readings are from the replacement boards. on the power switch I am getting 2.3, not 3.3 as I had posted. not sure if that's a typo, but I am getting the 2.3 volts back to the board on J6 pin 8. J6 goes to power switch,volume,source..etc, but no voltage on ps_on when power switch is pushed

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: vizio

                        What happen if you use the remote to turn on the TV? We want to make sure it is not the power switch problem, to have two main board acting the same way is odd unless the replacement board is also bad.
                        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

                        • markmac3
                          Member
                          • Sep 2017
                          • 22
                          • USA

                          #32
                          Re: vizio

                          Originally posted by budm
                          What happen if you use the remote to turn on the TV? We want to make sure it is not the power switch problem, to have two main board acting the same way is odd unless the replacement board is also bad.
                          I get the same results using remote. I checked the pins on the remote sensor which is hooked to the power switch board. had 3.9v on one pin, it would drop the voltage when pressing the remote power button, nothing stable to read but it got no lower than 3.3. also checked J6 and on pin 5 it had the voltage drop like the remote sensor
                          Last edited by markmac3; 09-10-2017, 08:15 AM.

                          Comment

                          • markmac3
                            Member
                            • Sep 2017
                            • 22
                            • USA

                            #33
                            Re: vizio

                            Just got another Tcon board,and like the Bob Segar song, still the same. I unsoldered all caps, one at a time, to check, found a couple out of the 10%range, replaced them and still nothing. Thanks budm an ivtec for your help really appreciate it.

                            Comment

                            Related Topics

                            Collapse

                            • Tynan Dill
                              Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                              by Tynan Dill
                              I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                              Upon bringing it home and plugging it up, it showed a standby light.

                              I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                              The screen seems to blackout and stay black, but with a flashlight I can see the display.

                              With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                              Assuming...
                              11-22-2024, 01:46 PM
                            • cheeky2
                              Is it possible to upgrade from a Vestel 17MB97 main board to a 17MB110 Main board?
                              by cheeky2
                              I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
                              Obviously the same LVDS connector for the screen connection...
                              05-25-2024, 03:27 AM
                            • Dani_2024
                              Sceptre U550CV-UMR 4K LED, Bad Caps on Main Power Board?
                              by Dani_2024
                              Hi and thanks in advance for any input you might provide!
                              I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
                              Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO

                              Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this...
                              10-28-2024, 05:06 PM
                            • gavric
                              Vizio M70-C3 Half picture is bad, main board on its last leg?
                              by gavric
                              Hello, i am working on Vizio M70-C3. It can hardly power on, it takes 15 power button presses or remote. Seems like eeprom problem that I seen before but all reading online says that this tv has power board or main board problem.

                              When tv powers on vizio V logo shows nice on whole screen. picture 1
                              When it goes into tv mode it only shows good picture on left side of screen, right is all scrabbled up. pic 2
                              When i start youtube picture shows on left side fine, right is all scrambled. pic 2
                              When i click video to start playing picture goes black(like when you change...
                              09-02-2021, 08:55 PM
                            • fharris1977
                              Vizio D50u-D1 Dead: PSU or Main Board?
                              by fharris1977
                              Hi. Anyone who has experience with these vizio sets, which pin on this connector is the standby, the 5V pin? Trying to rule out the PSU before ordering a mainboard. I'm getting 0 Volts on all pins on this connector. Trying to jump the standby and PS ON pins to see if the PSU is functioning. Thanks in advance.
                              03-12-2024, 12:22 PM
                            • Loading...
                            • No more items.
                            Working...