Sony KDL-22BX200 no picture, backlight ok

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • yoghi07
    New Member
    • Apr 2015
    • 9
    • Italy
    #1

    Sony KDL-22BX200 no picture, backlight ok

    Hi guys I'm giving a try at repairing a sony bravia lcd tv, which doesn't work.
    When you plug it in, the backlight flashes briefly and stays on, but no picture shows up.
    The led indicator should turn orange and then green when you press the power button, but instead it stays red.
    Another issue is that you hear a buzzing noise coming from the back of the tv.

    I opened it up and it seems like someone has already replaced the transformer inverter and MAYBE the main transformer (I'm not sure about that) on the psu.

    What could the problem be? I'm thinking that the power could not be reaching the main board (I tried connecting a usb device and it gets no power).
    But then again, the led indicator light comes on..so yeah I have no clue.

    What do you guys think I should check on the board? Today I will take some pictures of the boards.

    Thank you so much!!
    Tags: None
    • yoghi07
      New Member
      • Apr 2015
      • 9
      • Italy
      #2
      Re: Sony KDL-22BX200 no picture, backlight ok

      I took some photos of the mb and the psu, for reference!

      I was wondering if buying a new mb would help, I could currently get one for 30€...

      Thanks for the help!

      Edit: I also found out that a fuse on the psu (4th picture top right corner) has been short-circuited with copper wire. It was definitely opened before!
      Attached Files
      Last edited by yoghi07; 05-03-2015, 11:39 AM.

        Comment

        • newtothis
          Badcaps Legend
          • Mar 2013
          • 1556
          • england
          #3
          Re: Sony KDL-22BX200 no picture, backlight ok

          Have a multimeter?

            Comment

            • yoghi07
              New Member
              • Apr 2015
              • 9
              • Italy
              #4
              Re: Sony KDL-22BX200 no picture, backlight ok

              Sadly, just an analog one. What voltages should I check in your opinion?

                Comment

                • yoghi07
                  New Member
                  • Apr 2015
                  • 9
                  • Italy
                  #5
                  Re: Sony KDL-22BX200 no picture, backlight ok

                  I also noticed that the optocoupler on the psu (white, 5th picture upper left corner) is a bit brownish. I tested the impedence on the diode side and it's the same if I measure both ways!
                  Could it be that? Just this optocoupler failing? I will get a new one this week, will update.

                    Comment

                    • yoghi07
                      New Member
                      • Apr 2015
                      • 9
                      • Italy
                      #6
                      Re: Sony KDL-22BX200 no picture, backlight ok

                      I'm starting to think that the psu is the real issue here. I also checked every fuse on the mainboard and they're all ok!

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: Sony KDL-22BX200 no picture, backlight ok

                          You need to find out if you are getting either 5V or 12VDC on the smd fuse on the T-CON board.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                            Comment

                            • yoghi07
                              New Member
                              • Apr 2015
                              • 9
                              • Italy
                              #8
                              Re: Sony KDL-22BX200 no picture, backlight ok

                              Checked, fuse is ok.

                                Comment

                                • vinceroger69
                                  Badcaps Legend
                                  • Mar 2012
                                  • 6714
                                  • uk
                                  #9
                                  Re: Sony KDL-22BX200 no picture, backlight ok

                                  Have you checked you have voltage to both sides of the t con board fuse what does it read?

                                    Comment

                                    • yoghi07
                                      New Member
                                      • Apr 2015
                                      • 9
                                      • Italy
                                      #10
                                      Re: Sony KDL-22BX200 no picture, backlight ok

                                      Yes, 5V both sides.

                                        Comment

                                        • yoghi07
                                          New Member
                                          • Apr 2015
                                          • 9
                                          • Italy
                                          #11
                                          Re: Sony KDL-22BX200 no picture, backlight ok

                                          I can't find a replacement for the psu at a decent price! Damn!

                                            Comment

                                            Previous template Next

                                            Related Topics

                                            Collapse
                                            • triplefour
                                              UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
                                              by triplefour
                                              this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
                                              i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
                                              unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
                                              according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
                                              09-13-2023, 10:43 PM
                                            • DKWS89
                                              Sony XBR 49x900E - Sound and backlight on but no picture
                                              by DKWS89
                                              Hey Guys,

                                              So a few months ago my Sony XBR 49x900e TV screen stopped displaying the picture but the backlight comes on and I still get sound when I use the remote and navigate to certain apps. I haven't checked anything with the meter yet but started with ordering some replacement boards. I've tried replacing the BMKS board (used from ebay) and also completed the firmware upgrade based on Nicks TV repairs youtube video. I've also replaced the TCON (twice) and PIB.

                                              All of these changes have resulted in the same issue with no picture. I've also tried disconnecting the ribbons...
                                              12-14-2023, 04:30 PM
                                            • roy.zhero
                                              Sharp LC50LE752E no picture and backlight, indicator light is lit
                                              by roy.zhero
                                              I acquired a free 50” TV. IT is a Sharp LC50LE752E. It does not show a picture and has no backlight, although the indicator light turns blue meaning it has turned on.

                                              When power is plugged in, the indicator light will turn on blue, the backlight stays off and nothing is visible, even with a flashlight. When pressing the touch buttons on the tv nothing happens. When pressing buttons on the remote control the indicator light will blink indicating the IRsignal was received, but nothing happens.

                                              When I hold the force-on-combination it will turn on. It then shows a perfect...
                                              09-20-2020, 01:57 PM
                                            • ronni
                                              Sony KD-43XE8005 with sound, backlight, no picture
                                              by ronni
                                              I have a Sony KD-43XE8005 with no picture on the TV when powered on. Audio and backlight work ok when powering on. Solid white indication light showing on front of tv bezel.

                                              When removing the left hand ribbon cable from the T-con board, a white image is displayed on that half of the screen and a black screen is shown on the right. If I gently rub the ribbon cable on the right an image or purple black bars appear. The cable doesnt appear damaged, and if swapped with the other ribbon cable the same flickering symptoms can be seen.

                                              Removing the LVDS cable results in...
                                              12-01-2022, 08:44 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
                                            • Loading...
                                            • No more items.
                                            Working...