Samsung Syncmaster 203b no back light after cap replacement

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • starmaxpc
    Senior Member
    • Oct 2009
    • 117
    #1

    Samsung Syncmaster 203b no back light after cap replacement

    i picked this item up locally for free. when i first plugged in to see whats happening, the blue power light blinked on and off continuously and no display no image dead! took item apart and found 3 bulged caps. 3 x 820uf/25 volt replaced with spares i had 3 x 1000uf / 25 volt. item back together now blue power light powers on stays on NO back light. i can see image with flash light. there is no 2 seconds to dark when powered on no back light activity. directions??
    Attached Files
    Tags: None
    • starmaxpc
      Senior Member
      • Oct 2009
      • 117
      #2
      Re: Samsung Syncmaster 203b no back light after cap replacement

      not sure what happened to that photo upload?
      Attached Files

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: Samsung Syncmaster 203b no back light after cap replacement

          Originally posted by starmaxpc
          NO back light.
          1) Check fuse F301. A good fuse should measure less than 1.0 ohms.

          2) Check the 2 mosfets that are sandwiched in between the two transformers for shorts.
          --- begin sig file ---

          If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

          We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

          Please do not post inline and offsite as they slow down the loading of pages.

          --- end sig file ---

            Comment

            • jetadm123
              Badcaps Legend
              • Feb 2010
              • 2169
              #4
              Re: Samsung Syncmaster 203b no back light after cap replacement

              Your photo's a little blurry, but try checking the fuse, PF301? It's the green fuse between the heatsink and the inverter transformer on the left side of your photo.

              retiredcaps already beat me to it!

                Comment

                • starmaxpc
                  Senior Member
                  • Oct 2009
                  • 117
                  #5
                  Re: Samsung Syncmaster 203b no back light after cap replacement

                  Thanks gentlemen!! the fuse was bad. it is now working good!!

                    Comment

                    • pr0cess0r
                      Senior Member
                      • Jan 2011
                      • 110
                      #6
                      Re: Samsung Syncmaster 203b no back light after cap replacement

                      Thx i fixed 2 of those screen with 4 bad caps and bad fuse!!

                        Comment

                        Previous template Next

                        Related Topics

                        Collapse
                        • sam_sam_sam
                          Lift Master Garage Door wall switch display / motion sensor controller display disappeared no back light
                          by sam_sam_sam
                          This happened last Saturday and today I finally had time this morning before I went to work to replace two non brand capacitors

                          I will let you be the judge weather or not these are bad or not according to the blue ESR meter that I am using

                          I am comparing them to a brand new one that I installed

                          The display came back on and the programming was not lost which I was surprised by I would have thought that when the display went blank that so did the memory as well

                          I going to let it run for several days before I remount back on the wall next to the...
                          09-05-2024, 06:48 PM
                        • PNI E.
                          tcl u65x9006 back light on but no picture sounf ok after 40 50 secs
                          by PNI E.
                          hi guys, i need your help again...i have tcl u65x9006. while i was watching it become darker like when a movie ends, little by little the image disappear. now if i turn on i have back light on, after like 1 min i have also sound but no picuture. the back light is on i take off one at time the ldvs but nothing change always no picture. i tried to cover with a piece of paper the pin of ldvs i cover like 7 8 pins but nothing worked. the tv stay with no picture. there is a tcon board.i checked the voltage there on the fuse i have 11,8 volts. there is caps in shorts on the exit of the tcon i have...
                          02-20-2025, 08:36 AM
                        • koby058
                          vostro comes up with back light but no picture
                          by koby058
                          Hi people!!
                          The owner said it showed bad picture once in a while (attached)
                          I see that there is back light but no picture.
                          I want to ask if it is possible to disable the NVIDIA GPU and use the intel one?

                          Also attached schematic and BDV

                          LINK to schematic & boardview - https://www.badcaps.net/forum/troubl...ll-vostro-5590...
                          07-13-2025, 01:03 PM
                        • Tynan Dill
                          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                          by Tynan Dill
                          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                          Upon bringing it home and plugging it up, it showed a standby light.

                          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                          The screen seems to blackout and stay black, but with a flashlight I can see the display.

                          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                          Assuming...
                          ORIGINAL POWER SUPPLY BOARD
                          7 Photos
                          11-22-2024, 01:46 PM
                        • jdawg99
                          LG 47LA620V Same LED Failing Back Light Issues
                          by jdawg99
                          Hi All,

                          I need some help with this one please. I am attempting a repair on the backlight. TV turns on and flashes the LG logo so stripped it down and found one faulty LED. Replaced it and tested on an LED tester and the strip was good. Put it back onto the PSU and it lasted about 20 seconds before going out again. Same LED had blown. Changed it for another type of SMD one (same voltage) and it seemed fine. Put the TV back together but it was quite dim. Noticed it was in power save mode so turned it off and the screen was bright. Left it on for half an hour only to come back to the...
                          04-23-2023, 01:04 PM
                        • Loading...
                        • No more items.
                        Working...