e550vl no picture or backlights

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • johns1mj
    Badcaps Veteran
    • May 2015
    • 242
    • United States

    #1

    e550vl no picture or backlights

    Read through the other posts and have concluded I have a bad main board. I wanted someone to double check my information to make sure I didn't miss anything.

    Symptoms- 1)No backlights 2) No picture even with flashlight.

    When powered on-

    Power supply
    CN201 connector on the main board has all correct voltages except the C labled pin which only has .763 volts when on. I assume this is supposed to be between 1.5 and 3 volts for normal backlight on operation. Pin A has 2.814 volts.
    CN202 has .763 volts on pin C and 3.209 volts on pin A. The 24 volts pins are correct.
    CN203 has A,B and C slots empty. The 24 volts are present on pins.

    CN204 has both 18 volt references.
    Master
    CN24
    2)stnby 0.294
    3)on/off 2.95
    6)SRT 2.815
    7)ctsync out 1.988
    11)ss 3.074
    Pins 1,4,5,8,9 and 10 are 0
    CN1
    Pins 1-5 are 24.26
    Pins 6-10 are 0
    Pins 11 and 14 are empty
    Pin 12 3.209
    Pin 13 .763
    Slave
    CN201
    Pins 1-5 are 24.26 volts
    Pins 6-10 are 0 volts.
    If I remove the "C" pin on power supply CN201 the backlight will turn on. Still no picture.

    Please advise any fault in readings or test procedure.

    Was able to get it over to a hdmi port and it has sound.
    Attached Files
    Last edited by johns1mj; 10-25-2017, 03:14 PM. Reason: update
  • johns1mj
    Badcaps Veteran
    • May 2015
    • 242
    • United States

    #2
    Re: e550vl no picture or backlights

    did the 5 volt to back light on test and the back light come on but still no picture. Any thoughts?

    Comment

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

      #3
      Re: e550vl no picture or backlights

      Looks like a bad T-CON Bd. from what I've read. Is the T-CON Bd separate from the panel?? However, I'll wait for the others to chime in, first.

      Comment

      • johns1mj
        Badcaps Veteran
        • May 2015
        • 242
        • United States

        #4
        Re: e550vl no picture or backlights

        It is the same board. I don't know if I blew the tf1 fuse while testing or if I missed it originaly. I replaced it and there were lines on screen for about 1 second and then the fuse blew again.

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa

          #5
          Re: e550vl no picture or backlights

          You would need to find reason fuse is blowing
          I assume no responsibility for any stupid suggestions I might post.

          Comment

          • budwich
            Badcaps Legend
            • Jul 2015
            • 3097
            • Canada

            #6
            Re: e550vl no picture or backlights

            unplug one "half" of the tcon to panel cables.... see if the fuse blows ... assuming you have more... :-) try the other half. See if the panel comes up without blowing the fuse on "half tcon".

            Comment

            • johns1mj
              Badcaps Veteran
              • May 2015
              • 242
              • United States

              #7
              Re: e550vl no picture or backlights

              it took out the tc2 resister next to the f1 fuse.

              Comment

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

                #8
                Re: e550vl no picture or backlights

                I am still unsure if the T-CON Bd is separate to the Panel. If it is separate, replacing the T-CON Bd would remedy your problem.

                Comment

                • johns1mj
                  Badcaps Veteran
                  • May 2015
                  • 242
                  • United States

                  #9
                  Re: e550vl no picture or backlights

                  T-con is part of the main/input board

                  Comment

                  • ecking767
                    Badcaps Veteran
                    • Oct 2009
                    • 492
                    • USA

                    #10
                    Re: e550vl no picture or backlights

                    I have repair this model Vizio before, and sometime found shorted caps and the main IC chip to shorted. you are in the right area for troubleshooting if the fuse keep blowing

                    I will check the cap and regulator I have highlighted in red
                    Attached Files

                    Comment

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

                      #11
                      Re: e550vl no picture or backlights

                      Replace the old Bd with an new one, since that is the case.

                      Comment

                      • ecking767
                        Badcaps Veteran
                        • Oct 2009
                        • 492
                        • USA

                        #12
                        Re: e550vl no picture or backlights

                        Originally posted by Andrew F. Ali
                        Replace the old Bd with an new one, since that is the case.
                        this model main board is very hard to find, no one has it, and when you do find one for it will be very expensive.

                        Comment

                        Related Topics

                        Collapse

                        • DXseekerMO
                          TCL 55US57 backlights, no picture.
                          by DXseekerMO
                          So here we go with another screen short TCL. For this exercise left and right will be reference looking at the screen.

                          The person I got this TV from said the color was bad in a vertical fashion about 1/4 of the way over the left side of the screen. Shortly after the symptoms below started.

                          Power Supply, main and T-CON board are working.

                          Symptoms: The TV has backlights but no picture with both FFC's attached to the T-CON and does not respond to the remote or buttons, and the TV appears to continuously re-boot.

                          Unhook FFC from left side...
                          09-18-2021, 03:56 PM
                        • stylishconsultant
                          un60j620dafxza - Samsung No Display Problem
                          by stylishconsultant
                          Hi All,

                          Need help.

                          I have a samsung un60j620dafxza led tv. When I plug it in it has no display, no sounds, and no standby lights.

                          So I opened the tv and disconnected the power to the mainboard and the backlight powered up. This according to many people says that this is a mainboard
                          problem. I checked the voltage coming from the stb and I read 1.3 volts on pins 1,3,5 and 7 which are low volts instead of 13 volts which i think the lcd panel
                          might be drawing too much power from the power supply that it prevents the right voltage going to the mainboard....
                          09-04-2024, 03:26 AM
                        • bpcannan
                          VIZIO M557-G0: Backlights or ???
                          by bpcannan
                          'Morning,
                          I get sound and picture when powering on the TV and its stays that EXCEPT that the left half of the screen will dim every few seconds then return to normal while the right side of the screen performs as designed.

                          Did the soft and hard reset options pulling the plug, using the reet option in the vizio menu to no avail.

                          I checked the mainboard - found some popped capacitors so replaced it - but that did not change the situation.

                          I checked the t-con board. It is getting good power. Then I removed one ribbon cable to see if I could isolate...
                          10-29-2023, 06:36 AM
                        • sordids999
                          SAMSUNG UE43AU7020K BACKLIGHTS BUT NO PICTURE
                          by sordids999
                          Hi
                          Really stuck on this TV
                          I'm thinking it's a bad screen ?
                          Voltages all seems good
                          Tcon 12v ok
                          Remove one tcon cable at a time no half image on the screen just backlight and no picture
                          even tried the tape trick still no luck

                          Thanks...
                          05-12-2025, 10:36 AM
                        • stinger
                          Samsung UN70TU6980FXZA no sound no picture but does have backlights
                          by stinger
                          When I turn tv on, the backlights come on but there is no sound or picture. I have read that these tv's have problems with the panels going bad but the "no sound" has me questioning if the main board is bad. Is there a way to troubleshoot the main board to determine if that is the problem?
                          04-17-2024, 03:06 PM
                        • Loading...
                        • No more items.
                        Working...