Sony KDL-46EX500 - Black Screen & No Sound

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • TruWu
    New Member
    • Jul 2014
    • 4
    • Canada

    #1

    Sony KDL-46EX500 - Black Screen & No Sound

    Hello, as the title states I've got a Sony KDL-46EX500 which occasionally has a black screen problem. Here's the full story -

    First problem was the volume being stuck at 255 (max) level, which would not change with the remote or controls on the side of the TV. The only way to fix the problem was to factory reset. Eventually this problem went away, but soon the white colours on the TV turned a fuchsia colour. I did some research and it appeared the problem was with the main board. I changed the main board which fixed this problem. The TV worked fine for a few days but then one day it would turn on and have a black screen with no sound.

    The current problem of a black screen does not always happen. The TV will work completely fine, for an hour or so and then when you turn it off, and try to power it back on, it will have the normal green LED light but the panel will not come on, black screen and no sound. The Sony logo will not appear either. When the problem occurs, the TV does not respond to the remote and the side controls will not work either. The only way to turn the TV off is to pull the plug. Leaving the TV unplugged for several hours or overnight fixes the problem until it re-occurs after using the TV for a short period of time.

    Does anyone have some suggestions as to what the problem could be? As I stated, the TV works perfectly fine for an hour or so, but then will not work when you turn it off and then attempt to turn it back on. Firmware has been updated to the latest version on Sony's website.

    Any input would be greatly appreciated.
    Last edited by TruWu; 02-26-2015, 02:01 AM.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Sony KDL-46EX500 - Black Screen & No Sound

    Did you try firmware:
    http://esupport.sony.com/US/p/swu-do...mdl=KDL46EX500
    Attached Files
    Last edited by budm; 02-26-2015, 11:02 AM.
    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

    • TruWu
      New Member
      • Jul 2014
      • 4
      • Canada

      #3
      Re: Sony KDL-46EX500 - Black Screen & No Sound

      Yes, firmware was previously updated to 1.514, which did not make any difference to the black screen issue.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Sony KDL-46EX500 - Black Screen & No Sound

        I suspect that you do have main board problem per some of the symptom you have described.
        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

        • TruWu
          New Member
          • Jul 2014
          • 4
          • Canada

          #5
          Re: Sony KDL-46EX500 - Black Screen & No Sound

          Thanks for the input.

          I previously replaced the main board, which was bought brand new to fix the fuchsia color problem.

          I tried swapping out the main board with the old one, and it gave the same problem after using the TV for an hour.

          Comment

          • mthompso
            New Member
            • Aug 2015
            • 3
            • usa

            #6
            Re: Sony KDL-46EX500 - Black Screen & No Sound

            I have the exact same problem as truwu. Green light comes on, but no picture or sound. Sony logo doesn't come up and the only way to power off is to unplug the power cord. I had previous issues of sound maxed out and the white fusia colors on screen. i have replaced the power board from with one from shop jimmy & replaced the main board or A board from sears parts direct. still have green light no picture, no sound. Someone please help!!! Ready to throw it out and buy new tv.

            Comment

            • tibimakai
              Badcaps Legend
              • Jan 2012
              • 3680
              • USA

              #7
              Re: Sony KDL-46EX500 - Black Screen & No Sound

              Mainboard needs a firmware upgrade, no?

              Comment

              • nuala
                Member
                • Aug 2013
                • 37
                • USA

                #8
                Re: Sony KDL-46EX500 - Black Screen & No Sound

                The main would send the power-on voltage to the power supply and the ps would come up, but then the main would not send the other turn on voltages to the ps, the inverter-on and t-con-on. After changing the main and power boards it turned out to be an intermittent problem with the ir board.

                Comment

                • mthompso
                  New Member
                  • Aug 2015
                  • 3
                  • usa

                  #9
                  Re: Sony KDL-46EX500 - Black Screen & No Sound

                  After I installed the main board, I was able to power on & see the system settings firmware was 1.515, so that should be latest update. It will work fine for a couple of days & then go back to no pic no sound. Usually leaving unplugged for days will allow it to work again. So, the IR board was causing your issue (nuala)?

                  Comment

                  • Moreno83
                    Badcaps Legend
                    • Jun 2014
                    • 2008
                    • The Netherlands

                    #10
                    Re: Sony KDL-46EX500 - Black Screen & No Sound

                    When the screen goes black , did you try the flashlight trick and see if you can see a picture? If not , looks like backlight shuts down. No bad caps on the ps?
                    I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                    Comment

                    • mthompso
                      New Member
                      • Aug 2015
                      • 3
                      • usa

                      #11
                      Re: Sony KDL-46EX500 - Black Screen & No Sound

                      Moreno83, I don't see what appears to be any bad caps on the main board nor the power supply board. Haven't done the flashlight trick, but it either works fine, or powers on to green indicator with no sony logo on screen and no start up sony sound.

                      Comment

                      Related Topics

                      Collapse

                      • Audeze
                        Sony XBR-75X950G seems dead with a black screen but backlight and sound is working and no blinking red lights
                        by Audeze
                        I have a 2019 75" x950g, and while playing a movie, the screen suddenly went dark in a weird way, where it faded towards one corner into being fully black. Now the TV turns on, and the backlight comes on, but there is nothing displayed except black. Sound still comes through the TV speakers, and i have tried doing a hard reset using the volume - and power buttons while plugging the display back in, but it did not fix it. I can confirm that pressing buttons on my remote is still doing "something" because I'm hearing sound still, even though the screen is black.

                        Does...
                        10-06-2024, 08:54 PM
                      • salvatore22
                        Sony KD-55XE8505 black screen with sound
                        by salvatore22
                        Hello everyone…I hope someone can help me to figure out…i have a sony tv which the screen is black but i can hear the sound …so I try in another similar tv a t-con , motherboard and all works perfect but in this tv i see only a black screen with illumination…the display is not broken ..so I think the problem is on the buffer board …someone can help me? Thanks in advance
                        10-31-2023, 09:30 AM
                      • 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
                      • totof
                        LG 43UF640V backlight good but black screen and no sound
                        by totof
                        Good morning.
                        I have a problem with my LG Smart 43UF640V TV. It starts, the backlight comes on but nothing is displayed on the screen and there is no sound.
                        I thought it was a TCon problem and ran various tests. If I disconnect one or the other of the cables from the tcon to the panel then the screen is white on the side where the cable is disconnected and black on the other side. If the two cables are disconnected the screen is completely black.
                        In the 4 configurations I measure exactly the same voltages on the tcon card (model V15 43UHD TM120 Ver0.4) :

                        HVDD : 7,28...
                        04-13-2024, 11:37 PM
                      • Loading...
                      • No more items.
                      Working...