Samsung LN40A550P3FXZA screen goes BLACK

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • twilliard
    Member
    • Aug 2014
    • 29
    • US
    #1

    Samsung LN40A550P3FXZA screen goes BLACK

    Samsung LN40A550P3FXZA

    TV seems to be working ok, Good picture and sound

    Then this problem occurs:

    Sometimes when changing channels, The TV screen goes BLACK /with sound and does not show picture nor can you see the Menu

    Checked capacitors no signs of bulging

    Any ideas what to start checking

    Thank You
    Last edited by twilliard; 10-18-2014, 12:07 PM.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Samsung LN40A550P3FXZA screen goes BLACK

      Check if the backlight goes out. You can check if the lighting visible from the back of the set goes off, or if the screen loses its slight glow. If there is still a glow from the screen, it's probably T-con/Main/Panel related, if it doesn't glow, it's probably PSU/Backlight related.
      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

        • twilliard
          Member
          • Aug 2014
          • 29
          • US
          #3
          Re: Samsung LN40A550P3FXZA screen goes BLACK

          Now No picture

          No Backlight

          still have sound

          ??

            Comment

            • caphair
              Badcaps Legend
              • Nov 2011
              • 1249
              #4
              Re: Samsung LN40A550P3FXZA screen goes BLACK

              How old is the tv? I'd suspect caps, even if they didn't look bulged they could be bad. Take some voltage measurements

                Comment

                • johnboy1313
                  Badcaps Legend
                  • Nov 2012
                  • 1959
                  • USA
                  #5
                  Re: Samsung LN40A550P3FXZA screen goes BLACK

                  It's likely one of the transformers on the power supply/inverter board. Post pictures of your power supply.

                    Comment

                    • johnboy1313
                      Badcaps Legend
                      • Nov 2012
                      • 1959
                      • USA
                      #6
                      Re: Samsung LN40A550P3FXZA screen goes BLACK

                      Error
                      Last edited by johnboy1313; 11-18-2014, 09:25 PM.

                        Comment

                        • TechOp
                          Member
                          • Oct 2013
                          • 21
                          • USA
                          #7
                          Re: Samsung LN40A550P3FXZA screen goes BLACK

                          I agree with johnboy and I think I have some parts for this model.
                          sigpic
                          Anything can be fixed with enough TIME and enough MONEY

                            Comment

                            • twilliard
                              Member
                              • Aug 2014
                              • 29
                              • US
                              #8
                              Re: Samsung LN40A550P3FXZA screen goes BLACK

                              I replaced the power supply/inverter board, I think it was the transformer on the power Board

                              Thanks for all of the responses!!

                                Comment

                                • TechOp
                                  Member
                                  • Oct 2013
                                  • 21
                                  • USA
                                  #9
                                  Re: Samsung LN40A550P3FXZA screen goes BLACK

                                  I have replaced a few transformers on inverters. Now I scrap one board to use parts off it to fix the others.

                                  "The Needs of the many out weigh the needs of the few or the one"
                                  sigpic
                                  Anything can be fixed with enough TIME and enough MONEY

                                    Comment

                                    Previous template Next

                                    Related Topics

                                    Collapse
                                    • Mgiffune
                                      Samsung UN60EH6000F Black Screen, Backlight and Sound Good. Power Cycle Returns Picture
                                      by Mgiffune
                                      I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.

                                      I ordered a supposedly ‘new' Tcon board this time, and                                      ...
                                      06-09-2024, 10:28 AM
                                    • HTR-Informatique
                                      Dell G3 15 3500 - Battery bug (black screen and flashing keyboard backlight)
                                      by HTR-Informatique
                                      Hello,

                                      YouTube video of the problem encountered: https://youtube.com/shorts/q7TLNv36LUo

                                      I am a pro and I have a problem that I have never seen despite my 7.5 years of experience on my own and my thousands of repairs, on a customer's Dell G3 15 3500.

                                      On this PC I have already changed the complete palmrest because the keyboard was no longer working properly.

                                      I also changed the screen because the PC fell and the screen was broken.

                                      I changed the battery with a new and original battery.

                                      I also had corrosion/oxidation on the...
                                      02-09-2025, 06:51 AM
                                    • howardc64
                                      A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                                      by howardc64
                                      Problem

                                      This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                                      08-04-2024, 10:36 PM
                                    • totof
                                      Samsung UE50KU6070 black screen
                                      by totof
                                      Hello,
                                      I have my TV model UE50KU6070 which I am trying to repair.
                                      BN41-02528A / BN94-10800C motherboard.
                                      If I disconnect the motherboard from the power board, the backlight works. When the motherboard is connected the backlight works but the screen remains black.
                                      When I plug the TV into the electrical outlet, the standby LED lights up but no reaction to an attempt to start it with the remote control for about 1 minute. During this minute the TV consumes about 20W.
                                      After one minute the consumption drops to 0W and the TV can turn on with the remote control but...
                                      09-26-2022, 02:34 PM
                                    • VcemPzd
                                      Black screen Lenovo legion 5 pro 16ACH6H gaming laptop
                                      by VcemPzd
                                      Hello everyone !

                                      My name is Chris, I am a 30 years old embedded software developer working in the automotive industry. I am really passionate about learning new skills and repairing/crafting stuff. I came around this forum last week with the goal of repairing my faulty gaming laptop, indeed, I was video editing on it when suddenly a black screen popped and never disappeared I bought some stuff to try to repair it and learn as many things as possible about computer repairs but nothing worked so far. When the black screen appeared, my legion 5 pro was connected to my external monitor...
                                      04-28-2025, 10:14 AM
                                    • Loading...
                                    • No more items.
                                    Working...