Vizio V042L No Picture has backlights.

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #21
    Re: Vizio V042L No Picture has backlights.

    Ok with 1 and 8 jumpered I get a blue screen with menu and the TCON power LED is now on.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: Vizio V042L No Picture has backlights.

      Great. Any bad effects noticed from doing this? If not I'd just leave the jumper in place.
      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

      • landyboy
        Badcaps Veteran
        • Apr 2013
        • 443
        • USA

        #23
        Re: Vizio V042L No Picture has backlights.

        No It seems to work Fine. I will just place a perm jumper. Does this indicate that the fet is bad?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Vizio V042L No Picture has backlights.

          I think so, it probably has a source-gate short, which is reasonably common with FETs.
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: Vizio V042L No Picture has backlights.

            The T-CON gets turn off to safe power when TV is OFF, otherwise it will use about 10~15 Watts of power, but if it runs from 12v/24v switched power supply then it will not be drawing any power when TV is off
            Last edited by budm; 08-11-2013, 06:11 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

            • philliesfan30m
              Badcaps Veteran
              • Aug 2013
              • 542
              • USA

              #26
              Re: Vizio V042L No Picture has backlights.

              i know this problem was solved but i didn't want to open a new thread because i am having the same problem except that i don't have a reading on u44 and i'm not get power to the inverter board i'm getting power to the main video board but not to the inverter board and no power seems to be coming from the psu to be able to go to the inverter board thanks in advance for any help

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #27
                Re: Vizio V042L No Picture has backlights.

                You will not get the voltage to U44 untill the 12v/24v power supply is turn on by the main board. So right now the main board may not be sending the PS_ON to the power supply board or the 12v/24v POWER SUPPLY or the PFC Voltage booster is not working. Pictures of YOUR power supply board? The rest of the regulators on the main board checked out OK?
                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

                • philliesfan30m
                  Badcaps Veteran
                  • Aug 2013
                  • 542
                  • USA

                  #28
                  Re: Vizio V042L No Picture has backlights.

                  yeah all the regulators checked out almost exactly as to the reading the person who started the thread has. here are some pics of the boards. what do i need to start checking next? i was reading other threads and they were all saying the inverter board was bad. cause the 2 mosfets i checked read 0 and the other 2 read 10k and they were saying they should read 8.5k i think. the orange vizio light turns to white but i don't have anything on the screen no backlight that i can tell i used the flashlight thing and i couldn't see any pic at all. that is why i have so many pics of the inverter board cause they say the 1 ic goes bad causing the mosfets to go bad from what i read. could the caps be bad also? sorry 1 thing at a time lol thanks in advance for any help
                  Attached Files

                  Comment

                  • manstoblame
                    Senior Member
                    • Jan 2011
                    • 85

                    #29
                    Re: Vizio V042L No Picture has backlights.

                    Here's a dumb Idea clean or replace the cables going to the T-Con board and see if that helps

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Vizio V042L No Picture has backlights.

                      Since you are not getting the 12v/24v at the power supply output, you need to find out if you are getting PS_ON signal to turn on the power supply or not, there are labels at the the connector, look for PS_ON, it should have around 3vDC. You need to verify if the power supply is working or not. You can disconnect the power cable to the Inverter board to see if the 24v will present.
                      This model is known for having blown Inverter board.
                      http://s807.photobucket.com/user/bud...?sort=3&page=1
                      Last edited by budm; 08-29-2013, 12:09 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

                      • philliesfan30m
                        Badcaps Veteran
                        • Aug 2013
                        • 542
                        • USA

                        #31
                        Re: Vizio V042L No Picture has backlights.

                        ok the tv is plugged in and i checked the pson and it has 0 volts i also checked everything else and the only place i have volts is at the 5 volt standby which i have a little over 5 volts on all 3 connectors but nothing anywhere else

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: Vizio V042L No Picture has backlights.

                          So it means the main board is the problem right now, you can disconnect just that PS_ON connection that goes back to the main board and use 1K resistor between the 5V and the PS_ON pin of the power supply to force on the 12/24v section.
                          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

                          • philliesfan30m
                            Badcaps Veteran
                            • Aug 2013
                            • 542
                            • USA

                            #33
                            Re: Vizio V042L No Picture has backlights.

                            ok i did that and have 12 and 24 volts now what do i need to check?

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #34
                              Re: Vizio V042L No Picture has backlights.

                              This indicates the main board is bad.
                              If you get a second 1k from 5V to BL ON (maybe labelled as "A" or "B", try both) and backlight comes on, you know only fault is with main board.
                              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

                              • philliesfan30m
                                Badcaps Veteran
                                • Aug 2013
                                • 542
                                • USA

                                #35
                                Re: Vizio V042L No Picture has backlights.

                                it has an a-b and c on it so if i run a 1k resistor between the 5 volt standby to where the a-b or c goes into the inverter board then the backlight should come on? and is the main board fixable or not?

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: Vizio V042L No Picture has backlights.

                                  You know, just to be sure, report YOUR regulators voltage readings for us to see.
                                  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

                                  • philliesfan30m
                                    Badcaps Veteran
                                    • Aug 2013
                                    • 542
                                    • USA

                                    #37
                                    Re: Vizio V042L No Picture has backlights.

                                    ok i will do that in a few seconds but does it matter what is hooked up? do u want me to plug back in all the connectors or doesn't it matter?

                                    Comment

                                    • philliesfan30m
                                      Badcaps Veteran
                                      • Aug 2013
                                      • 542
                                      • USA

                                      #38
                                      Re: Vizio V042L No Picture has backlights.

                                      here are the regulator readings with the tv on and the white vizio light on and the connector connected to the psu and main board but not to the inverter board and the t-con light comes on for a few seconds then fades off

                                      u15 -1.24, 0, +1.70
                                      u16 +11.04 0, +5.05
                                      u17 -1.23 0, +1.72
                                      u19 -1.24 0, +2.55
                                      u20 -1.25 0, +1.49
                                      u21 -1.23 0, +1.25
                                      u22 -1.23 0, +1.78
                                      u44 -1.24 0, +1.43


                                      they aren't even close to what the original poster had. what else do i need to check out?

                                      Comment

                                      • philliesfan30m
                                        Badcaps Veteran
                                        • Aug 2013
                                        • 542
                                        • USA

                                        #39
                                        Re: Vizio V042L No Picture has backlights.

                                        and the t-con light only comes on if the connector to the inverter board is disconnected then it comes on for a few seconds when you turn the tv on but if the connector is disconnected and you turn the tv on then the blue light on the t-con board never comes on at all if that matters.

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #40
                                          Re: Vizio V042L No Picture has backlights.

                                          So how do I read the list voltage on the list?
                                          For example on U21:
                                          u21 -1.23 0, +1.25
                                          How do count the pins?
                                          One pin is Minus 1.23v, second pin is 0V, third pin is 1.25V?
                                          Can you also put down the no. as printed on the body? Those with Minus number sure cannot be right.
                                          Please report the reading in the format as shown in this thread:
                                          https://www.badcaps.net/forum/showth...999#post300999
                                          If you look at the regulator (1117 series) with the big tab up, left pin is the pin1, middle pin is pin 2 which is also tied internally to the big tab), right pin is pin 3.
                                          U16 is not 1117 series, it is just the 5V regulator.
                                          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

                                          Related Topics

                                          Collapse

                                          • Document Archive
                                            LCD LED TV Service Menu Codes
                                            by Document Archive
                                            ALL LCD LED TV SERVICE MENU CODES

                                            Service Menu Code with Board Name

                                            China Universal Board / Jumper Board Service Menu Code
                                            Changhong Ruba Service Menu Code
                                            Ecostar LED TV Service Menu Code
                                            Orient LED TV Service Menu Code
                                            Haier LED TV Service Menu Code
                                            TCL LED TV Service Menu Code
                                            Samsung LED TV Service Menu Code
                                            LG LED TV Service Menu Code
                                            Videocon LED TV Service Menu Code
                                            Supra LED TV Service Menu Code
                                            Toshiba LED TV Service Menu Code
                                            Symphony LED TV Service Menu Code
                                            Veste/ LED TV Service Menu Code...
                                            10-31-2024, 03:58 AM
                                          • Ierwin
                                            Philips 58PUS7805 Menu working but no/weird picture from video sources
                                            by Ierwin
                                            Hello everyone,

                                            I got a 58pus7805 that shows some weird behavior.
                                            The menu and remote work fine and the picture is looking crisp and flawless while navigating the menu.
                                            However, when a video source is displayed the screen either goes solid green (HDMI), solid black (SAT TV) or shows some fragments on mostly green background (AVI Playback from USB).

                                            I tried to reinstall the firmware through the menu which was rejected saying it already had the latest version.
                                            I managed to install the latest official firmware by holding the control button while plugging...
                                            03-10-2024, 12:50 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
                                          • csmith
                                            Vizio-D50u-D1 Pulsating Backlights
                                            by csmith
                                            This Vizio came in the shop with no backlights. Replaced all the strips with replacement from Shop Jimmy. Set now has backlights but lights pulsate on left side. Half the screen brightens up then goes to normal then repeats.
                                            Am I looking at a defective strip? Thanks in advance.
                                            11-07-2024, 02:56 PM
                                          • tusiime
                                            How to access Vizio m652i-b2 service menu
                                            by tusiime
                                            The current main board on my Vizio m652i-b2 only has 1 of 4 HDMI ports working. Also, the coaxial port is not working.

                                            So I ordered a replacement board. It boots up the tv, but the display is dark in areas, colors are off, etc. I have seen information online that a setting in the service menu may need to be adjusted. Have tried many ways to access the service menu using remote codes, but none work.

                                            Can someone here provide the confirmed method for accessing the service menu on this tv? Thanks in advance!
                                            09-15-2023, 09:57 AM
                                          • Loading...
                                          • No more items.
                                          Working...