LG 42PA4500 plasma TV no picture no sound

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • dfowler340
    Member
    • Oct 2015
    • 10
    • USA
    #1

    LG 42PA4500 plasma TV no picture no sound

    Hello,

    I have a 3 year old LG 42PA4500-UF plasma TV that suddenly lost picture and sound, and I was hoping somebody could help diagnose the problem.

    When it first happened everything went black and the standby light on the front panel was a solid red. Trying to cycle the power (via remote and/or the push button on the TV) only resulted in the standby light flashing once and then going solid again.

    I opened up the back panel and confirmed with multi-meter that the two fuses on the power supply board are ok. I see no other evidence of electrical burnout on any of the boards or components.

    Also, now when I plug the power cord back in, the standby light on the front panel does not light up. The only response I get whatsoever is a slowly flashing red LED on the main board.

    Any suggestions for troubleshooting? I don't want to start replacing boards without a solid idea as to what the culprit is.

    Thanks in advance!
    Tags: None
    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: LG 42PA4500 plasma TV no picture no sound

      Hello, can you upload some pictures of the boards and the tv please.
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • dfowler340
          Member
          • Oct 2015
          • 10
          • USA
          #3
          Re: LG 42PA4500 plasma TV no picture no sound

          Hi...pictures are attached, thanks for responding
          Attached Files

            Comment

            • Hamie
              Badcaps Legend
              • Apr 2014
              • 1383
              • UK
              #4
              Re: LG 42PA4500 plasma TV no picture no sound



              Connect the 2 holes marked ext_auto_gen on your control board with a bit of wire. Paper clip etc.

              Disconnect the lvds cable (the one with the black tape over it).



              Power on tv, if you get test patterns you have a faulty main board.

                Comment

                • dfowler340
                  Member
                  • Oct 2015
                  • 10
                  • USA
                  #5
                  Re: LG 42PA4500 plasma TV no picture no sound

                  Thanks, I will give that a shot tonight.

                    Comment

                    • dfowler340
                      Member
                      • Oct 2015
                      • 10
                      • USA
                      #6
                      Re: LG 42PA4500 plasma TV no picture no sound

                      Hamie,

                      I tried what you suggested however I still have no picture or sound. As before, the standby light on the front panel stays a solid red and flashes once when you press the power button. No other sounds or lights of any kind. Any other thoughts?

                      Thanks

                        Comment

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain
                          #7
                          Re: LG 42PA4500 plasma TV no picture no sound

                          Ok, do you have a DMM ?
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                            Comment

                            • dfowler340
                              Member
                              • Oct 2015
                              • 10
                              • USA
                              #8
                              Re: LG 42PA4500 plasma TV no picture no sound

                              Yes

                                Comment

                                • Hamie
                                  Badcaps Legend
                                  • Apr 2014
                                  • 1383
                                  • UK
                                  #9
                                  Re: LG 42PA4500 plasma TV no picture no sound

                                  Ok unplug this connector here.



                                  Try and power on the tv..

                                  You'll notice also in the above picture there is a wire jumper marked VA-TP
                                  There should also be a similar one marked VS-TP.

                                  What voltage do you get at these 2 test points. You may find the voltage drops after a few seconds, so plug in, turn on, and quickly measure each test point.

                                  Dc volts - red probe to wire jumper - black probe to chassis ground.

                                  Be careful don't short anything out.

                                    Comment

                                    • dfowler340
                                      Member
                                      • Oct 2015
                                      • 10
                                      • USA
                                      #10
                                      Re: LG 42PA4500 plasma TV no picture no sound

                                      VA-TP: 1.0 - 1.5 mV
                                      VS-TP: 5.0 - 8.0 mV

                                      In both cases the readings fluctuate within the range I've listed but they never drop off completely.

                                        Comment

                                        • Hamie
                                          Badcaps Legend
                                          • Apr 2014
                                          • 1383
                                          • UK
                                          #11
                                          Re: LG 42PA4500 plasma TV no picture no sound



                                          Can you measure the voltage on either of these 2 capacitors.
                                          Black probe to the negative leg red to the other.

                                          Post back the voltage.

                                          Also please upload a clear picture of this table.

                                            Comment

                                            • dfowler340
                                              Member
                                              • Oct 2015
                                              • 10
                                              • USA
                                              #12
                                              Re: LG 42PA4500 plasma TV no picture no sound

                                              Both capacitors read about 161 volts. Attached is a picture of the table.
                                              Attached Files

                                                Comment

                                                • dfowler340
                                                  Member
                                                  • Oct 2015
                                                  • 10
                                                  • USA
                                                  #13
                                                  Re: LG 42PA4500 plasma TV no picture no sound

                                                  Hamie - any suggestions for what to check next?

                                                  Thanks

                                                    Comment

                                                    • Hamie
                                                      Badcaps Legend
                                                      • Apr 2014
                                                      • 1383
                                                      • UK
                                                      #14
                                                      Re: LG 42PA4500 plasma TV no picture no sound

                                                      what is the voltage when on the either of the primary capacitors when you press the on button? Does it rise or just stay the same?

                                                        Comment

                                                        • dfowler340
                                                          Member
                                                          • Oct 2015
                                                          • 10
                                                          • USA
                                                          #15
                                                          Re: LG 42PA4500 plasma TV no picture no sound

                                                          The voltage on both capacitors remains the same when pushing the ON button.

                                                          For what it's worth, both capacitors are now fluctuating between 375-400 V compared to the 161 volts that they were reading the last time I checked.

                                                            Comment

                                                            • jrpitale
                                                              New Member
                                                              • Dec 2016
                                                              • 1
                                                              • India
                                                              #16
                                                              Re: LG 42PA4500 plasma TV no picture no sound

                                                              Guyz

                                                              I am having same problem with same model of LG plasma TV

                                                              Please suggest me to work around in same issue.

                                                              Thanks

                                                              Jatien

                                                                Comment

                                                                • Andrew F. Ali
                                                                  Badcaps Legend
                                                                  • Jan 2014
                                                                  • 2450
                                                                  • Trinidad & Tobago
                                                                  #17
                                                                  Re: LG 42PA4500 plasma TV no picture no sound

                                                                  Originally posted by jrpitale
                                                                  Guyz

                                                                  I am having same problem with same model of LG plasma TV

                                                                  Please suggest me to work around in same issue.

                                                                  Thanks

                                                                  Jatien
                                                                  Start your own new thread.....Don't worry if it is the same issue.

                                                                    Comment

                                                                    Previous template Next

                                                                    Related Topics

                                                                    Collapse
                                                                    • KYBOSH
                                                                      Hitachi 55HDS69 55" Plasma TV - No Picture But Sound
                                                                      by KYBOSH
                                                                      Picked up a bahemoth plasma TV not too long ago and just now getting around to looking at it.
                                                                      No picture but you hear the TV static (white noise) playing loud and clear.
                                                                      The back was already taken off (and no screws were provided) as the previous owner had already taken a look.
                                                                      But it seems they didn't get too far and just left it.

                                                                      When I first took a look I was amazed at how pristine the inside looked.
                                                                      Its as if the TV had been in a time capsule.
                                                                      Caps looked like they were just pulled off the self.
                                                                      Copper coils had no sign of corrosion on...
                                                                      02-01-2023, 11:10 PM
                                                                    • 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
                                                                    • 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
                                                                    • Ierwin
                                                                      Samsung UE60KU6079 backlight okay mainboard responsive, no picture, no sound
                                                                      by Ierwin
                                                                      Hello everyone,
                                                                      Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
                                                                      The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
                                                                      He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
                                                                      I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
                                                                      Anyway I still fully expect that there has been something seriously damaged...
                                                                      05-13-2025, 03:31 PM
                                                                    • jchang
                                                                      Samsung UN70NU6900F no picture and no sound
                                                                      by jchang
                                                                      Hi all

                                                                      I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.



                                                                      Symptom:
                                                                      No picture no sound.
                                                                      When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
                                                                      No sound at all.



                                                                      What I tried:
                                                                      1. I tried unplugging the left or right ribbon...
                                                                      01-09-2023, 06:28 PM
                                                                    • Loading...
                                                                    • No more items.
                                                                    Working...