Samsung LE40A567 - Dim picture

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Jooo
    Badcaps Veteran
    • Oct 2011
    • 222
    • Finland
    #1

    Samsung LE40A567 - Dim picture

    Hi,
    I have a Samsung LE40A567 LCD TV with a very dim picture.
    I found that PWMDIM was low.
    I connected PWMDIM to 5V through 1K resistor, and that restored the backlights and the picture was normal.
    I could access all the menus etc, but I couldn't tune any channels.
    I assume the mainboard is faulty. What could cause the PWMDIM to go low (0,2V) ?
    The mainboard model is BN41-01022D, I can take pics tomorrow if needed.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Samsung LE40A567 - Dim picture

      It could be a corrupted EEPROM. Try doing a factory reset.

      While the TV is in standby, press Info, Menu, Mute followed by Power. When the TV turns on select the reset option and execute it.
      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

        • Jooo
          Badcaps Veteran
          • Oct 2011
          • 222
          • Finland
          #3
          Re: Samsung LE40A567 - Dim picture

          Thanks,
          I removed the resistor before doing the factory reset, and now the backlights turned on even without the resistor.
          I still did the factory reset and now it found the channels too and everything seemed to work normally for a while (less than 5 minutes).
          Suddenly it lost signal, and only one channel continued to work.
          I restarted the TV and the backlights were flickering for a second or two after turning the TV back on.
          Then it was back to normal but only one channel works, no signal on the others.

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870
              #4
              Re: Samsung LE40A567 - Dim picture

              Hi I am trying to follow this but there is not much information on the LE40A567
              One site does suggest that this is NOT a set with LED backlights.
              PWMDIM seems to be associated with LED backlights so can you confrim that
              your set has LED and not CCFL tube backlight.

              Perhaps pictures would help.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Samsung LE40A567 - Dim picture

                  With a few rare exceptions all "LE", "LN", " LA" Samsung TVs have ccfl backlights
                  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

                    • Agent24
                      I see dead caps
                      • Oct 2007
                      • 4951
                      • New Zealand
                      #6
                      Re: Samsung LE40A567 - Dim picture

                      Originally posted by Jooo
                      What could cause the PWMDIM to go low (0,2V)
                      Could be whatever drives it is faulty, open pullup resistor (if any), or something shorted\low resistance to ground on the line. Or like tom66 said, a software issue - and that could be caused by many things...
                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                      -David VanHorn

                        Comment

                        • Jooo
                          Badcaps Veteran
                          • Oct 2011
                          • 222
                          • Finland
                          #7
                          Re: Samsung LE40A567 - Dim picture

                          Heres a few pics.
                          It has CCFL backlights.

                          The backlights work all the time now, although when turning the TV on they flicker for a second or two.
                          Attached Files

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • 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
                            • Document Archive
                              Samsung Galaxy Book 2 Notebook Specification for Upgrade or Repair
                              by Document Archive
                              This specification for the Samsung Galaxy Book 2 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Galaxy Book 2 boardview and Galaxy Book 2 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download...
                              09-07-2024, 05:50 AM
                            • TR103
                              Samsung TV model UE50TU: rebooting, backlight, sound, but no picture
                              by TR103
                              Hi, I have a Samsung UE50TU with:
                              - sound and backlight, but no picture
                              - when it arrived, it had a picture for a few seconds
                              - it keeps rebooting
                              - without ribbon cable between the two panel boards, it does not reboot but I have no picture
                              - without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
                              - when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.

                              - without cable between mainboard and lcd panel and with a jumpered...
                              01-22-2025, 04:12 PM
                            • 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
                            • JJAAMM
                              SAMSUNG UN55KS9000F picture fades then distorts into vertical lines after 20 seconds
                              by JJAAMM
                              This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.

                              Problem
                              TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode...
                              07-06-2023, 06:01 AM
                            • Loading...
                            • No more items.
                            Working...