horizontal "smear" panel fault?vestel alba lcd 40781f

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • jimbofz
    Badcaps Veteran
    • Apr 2013
    • 537
    • uk
    #1

    horizontal "smear" panel fault?vestel alba lcd 40781f

    Hi this early vestel with inverter and ccfl backlight came in with no backlight and it was the usual suspects on the inverter board ,4 fets ao4616 ,i ordered a kit and repaired inverter .
    i now have this smear approx 8 inch from bottom on left hand side
    its about half inch wide it stops approx 3/4 across .it doesnt change with pic content
    i have examined panel closely for any damage ,
    none of the tabs are running hot .
    would value your opinions if it is the panel.
    ive had many plasma and lcd tvs with horizontal lines,
    but they usually go right across .
    sorry the pics are not the best but it should give you all an idea of the problem
    Attached Files
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: horizontal "smear" panel fault?vestel alba lcd 40781f

      If you disconnect one then the other cables to the panel is the smear still there ?
      Willing to help but I'm no expert.

        Comment

        • jimbofz
          Badcaps Veteran
          • Apr 2013
          • 537
          • uk
          #3
          Re: horizontal "smear" panel fault?vestel alba lcd 40781f

          Originally posted by dick_barton
          If you disconnect one then the other cables to the panel is the smear still there ?
          sadly the smear lines are still there when i do the above test,
          looks like panel duff?

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales
              #4
              Re: horizontal "smear" panel fault?vestel alba lcd 40781f

              I would next check the LVDS cable both ends from the mainboard to Tcon
              It seems to be tearing along that line as opposed to lost data.
              Willing to help but I'm no expert.

                Comment

                • jimbofz
                  Badcaps Veteran
                  • Apr 2013
                  • 537
                  • uk
                  #5
                  Re: horizontal "smear" panel fault?vestel alba lcd 40781f

                  i have cleaned the lvds cable t con end
                  but the end at the mainboard is "old school" plug n skt
                  unlike all the others i have which are flat ribbon types.
                  i will try to get a replacement,
                  so may have to shelve it for a while
                  ill keep you posted mr B

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • howardc64
                      LG 49UJ6500 LCD panel lighter band that goes away
                      by howardc64
                      49UJ6500 LCD panel has a lighter band on top when first powered on. Goes away (or gets much fainter) after TV on for a few min. After powered off for awhile and power back on, same band appears. If powered on immediately after powering off, no or much fainter band. Running the latest firmware.

                      Disassembled the TV and lifted the LCD panel during testing. Band is on the LCD panel (can see the band on the panel as I lift it slightly) Backlight is perfectly even at the top edge. Double checked LCD panel alignment in the frame and is perfect but since band moved with the panel, its on...
                      02-19-2023, 12:13 AM
                    • triplefour
                      SAMSUNG UN50TU8000F rebooting, backlight ok. No 12v to panel boards.
                      by triplefour
                      TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.

                      tcon is built into mainboard.
                      Only one cable goes to panel boards.
                      there is a cable from one panel board to the other that links them.
                      cost cutting measure that results in us having harder time to diagnose.
                      removing the link to the second panel board allows TV to stay on with stable backlight but no image.
                      used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board....
                      07-28-2022, 07:59 PM
                    • Storyteller12
                      QN55Q60R Service Menu Panel Help
                      by Storyteller12
                      I had a the above tv qn55q60r that had a bad panel but everything else good. I had another panel here from un55nu6900 with bad leds and melted diffusers.

                      I put the nu6900 panel in and powered it up and it does work but there are lines vertical lines.

                      I was trying to change the panel type in the service menu but don’t see my exact panel. Anyway to fix this or someone have similar experience.

                      the clear picture is the panel type from the service menus on the nu6900. The other 1 is the panel type that was set for the q60r with the bad panel....
                      01-13-2024, 01:57 PM
                    • maneatingmonkey
                      Missing LCD Panel Voltages VGH, VGL, VCOM (TCL 55P6US Sound & Backlight but NO Picture)
                      by maneatingmonkey
                      I have a TCL 55P6US with sound and backlight but no picture. This model does not have a T-CON board, and the right (rear perspective) panel board is fed from the left panel board. I have not been able to induce any change by disconnecting the secondary panel board or the tape cut-off method on the primary board.

                      There are a bunch of voltages missing on the panel boards. I can't find any shorted caps of the panel boards, and all of the missing voltage rails read in the kiloohms, which leads me to suspect the issue may lie on the circuit board, rather than a short in the panel.
                      ...
                      L Panel #1
                      11 Photos
                      03-27-2024, 07:17 AM
                    • lostone
                      Looking for help with a Viewsonic VP230mb where the backlight comes on only momentarily
                      by lostone
                      Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.

                      First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
                      When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...
                      05-19-2024, 11:40 AM
                    • Loading...
                    • No more items.
                    Working...