60PA6500 - Same old problem, no picture but sound

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • chood2
    Member
    • Oct 2017
    • 11
    • USA
    #1

    60PA6500 - Same old problem, no picture but sound

    Hello all!

    Been doing some research and I can't find anything that covers what I'm looking for, besides this:
    https://www.badcaps.net/forum/showthread.php?t=18542&

    I have a LG 60PA6500 that currently turns on and has no picture but sound.

    I'll explain my situation. I'm a college student looking to fix this broken TV - I have resources for all the DIY I may need, from reflow soldering to oscilloscopes and infinite amount of testing equipment and supplies. This can be fixed, but I need to figure out what's wrong on it - That, I don't have much experience in.

    Here's some additional information:

    1. The control logic board does not flash at all - the 5V bus is getting power. The main board has a constant red light when I power it on. Can't find any information about if the logic board has no light!

    2. Where are schematics? Are there none? I feel like there's gotta be some service manuals or something -- All I can find is for the main board, which I would love to have for the other boards...

    3. I have replaced the left hand side (top and bottom) buffer boards, also tried per a forum/website to disconnect the Y and Z from the power supply -- no dice.

    4. Measured voltages -- Everything looks good with 5V, VA, VS --

    5. Obviously the fuses are all good to go... (Including ones that don't necessarily look like regular fuses)


    Where to start? I'm thinking/hoping if I can just replace the control logic board it'll fix everything but that might not be the case...
    Last edited by chood2; 10-22-2017, 04:22 PM.
    Tags: None
    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: 60PA6500 - Same old problem, no picture but sound

      You have stable VA,Vs. Have you tried to force test patterns?
      Service manual: https://www.manualslib.com/manual/11...-60pa6500.html
      Last edited by dskall; 10-22-2017, 05:02 PM.
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • chood2
          Member
          • Oct 2017
          • 11
          • USA
          #3
          Re: 60PA6500 - Same old problem, no picture but sound

          I'm not sure how to force a test pattern! Couldn't find the exact details for this model. How do I do this?

          **EDIT**
          I found this:
          "OK, on the CTRL board you can see a pair of holes on the bottom right hand of the board marked EXT AUTO GEN.

          Turn the TV power off (unplug the set)
          Place a wire link between these holes
          Disconnect the LVDS cable between the main board and control board
          Plug the TV in...do the test patterns cycle continuously?"

          Will test and come back.
          Last edited by chood2; 10-22-2017, 08:32 PM.

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia
              #4
              Re: 60PA6500 - Same old problem, no picture but sound

              good idea, I'd start there

                Comment

                • chood2
                  Member
                  • Oct 2017
                  • 11
                  • USA
                  #5
                  Re: 60PA6500 - Same old problem, no picture but sound

                  Originally posted by tw2005
                  good idea, I'd start there
                  Originally posted by dskall
                  You have stable VA,Vs. Have you tried to force test patterns?
                  Service manual: https://www.manualslib.com/manual/11...-60pa6500.html
                  Hi all, went ahead and tried to connect the EXT pins, disconnect the main blue connector (as shown on the right), and see if I get a test pattern. No dice.

                  Thoughts?

                  Click for Picture

                    Comment

                    • chood2
                      Member
                      • Oct 2017
                      • 11
                      • USA
                      #6
                      Re: 60PA6500 - Same old problem, no picture but sound

                      What might be some standard FETs or areas that go bad?

                        Comment

                        Previous template Next

                        Related Topics

                        Collapse
                        • slimmy182
                          [SOLVED] M1 MacBook Pro clicking sound logic board 5V no power on A2338 820-02020
                          by slimmy182
                          Hello, I bought this Mac from a friend, he said that it simply stop working. The MacBook looks very clean but does not power on, stuck on 5v 0.42A, and sometimes display 5V and 0A (then 0.071A and again 0A).

                          I opened it looking for some problem, it was not touched before for sure and the board is very clena, no spot of corrosion at all from what I can see. Voltage on multimeter of the board off the case it's the same, 5V 0.42A. But then I noticed this "clicking sound" come from the board ( I attached here the audio file).

                          Looking on google I found this:...
                          01-14-2023, 11:55 AM
                        • ermals
                          Samsung UN55H8000AF - No Picture, Working Backlight, Replaced T-Con Board
                          by ermals
                          Hi all!
                          I've recently run into an issue with my Samsung UN55H8000AF LED TV displaying no image. I've done quite a bit of research in terms of what could be wrong with it. Below are the steps I've taken prior to reaching out here for some assistance:

                          1. I've tried replacing the T-Con board (BN95-01594A), twice and have still experienced the same issue with all the boards I've tested with.
                          2. I've tried to remove one side of the ribbon cable that goes from the T-Con board to the panel and still not getting any image on left or right side.
                          3. I've checked voltages...
                          08-01-2022, 10:35 AM
                        • Sgj24
                          55" TCL 55us57-wtlaa TV - No picture, backlight/sound work, T-Con board was replaced
                          by Sgj24
                          Hello all, I was given a 55" 2017 TCL Roku TV that has an issue of no picture, but the backlights and audio are in full operation. I did some digging and narrowed it down to a possibly bad T-Con board, I replaced it today with a unit I got off of Ebay but the issue is still there. I'm not good with electronic testing (multimeter, soldering, etc.) so I would appreciate any insight on the likely cause. Screen appears undamaged and the remote can still switch around settings (I've tried a hard reset). I assume it could be the video or power boards, but I also had a theory on it being the ribbon...
                          09-10-2021, 01:40 PM
                        • garrymc123
                          Luxor TV board input board change but picture upside down
                          by garrymc123
                          Looking for some advice changed over the video input board due to bad hdmi ports but now the picture is upside down tried the service menu but can't find anything to do with flip the picture..

                          Is there anything I can do to flip the picture or do I need to change the board again..

                          Thanks
                          Garry...
                          08-29-2022, 04:53 AM
                        • gavric
                          Vizio M70-C3 Half picture is bad, main board on its last leg?
                          by gavric
                          Hello, i am working on Vizio M70-C3. It can hardly power on, it takes 15 power button presses or remote. Seems like eeprom problem that I seen before but all reading online says that this tv has power board or main board problem.

                          When tv powers on vizio V logo shows nice on whole screen. picture 1
                          When it goes into tv mode it only shows good picture on left side of screen, right is all scrabbled up. pic 2
                          When i start youtube picture shows on left side fine, right is all scrambled. pic 2
                          When i click video to start playing picture goes black(like when you change...
                          09-02-2021, 08:55 PM
                        • Loading...
                        • No more items.
                        Working...