lg 50LB659 screen problem -help

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • shopy
    New Member
    • Jan 2012
    • 7
    #1

    lg 50LB659 screen problem -help

    hello experts
    i have this problem on my lg
    when i start the tv the screen is black but the back light is on .if i disconnect one side of the reebons that is connected from the lcd to the main board i get a picture on the half of the screen .but when i connect this side back there is no picture at all.so i assume the other half of the screen cause a short to the tcon board and prevent it ro display .the tcon is integrated in the main board not separate.
    is it possible that the half of a screen will be defected.anyone has experience this ??
    any suggestions??

    thanks
    Tags: None
    • freakaftr8
      Badcaps Legend
      • Oct 2012
      • 3743
      • USA
      #2
      Re: lg 50LB659 screen problem -help

      This sounds likke a defective LCD panel unfortunately. The only thing you can do is look at the panel driver boards on the side that shuts the screen off completely and check for shorts against small SMD style MLCC capacitors
      Did I leave the soldering iron on?

        Comment

        • sangeet101
          New Member
          • Jan 2020
          • 9
          • usa
          #3
          Re: lg 50LB659 screen problem -help

          I have the same problem. I checked the SMD caps they show short. I took out one smd cap to check if that was really short but it was not short. I test the two points where the cap was sitting it shows short. there were 6 cofs on that side of the driver board. Do i have to change all short smd of each cofs. are they related ? or is the short really coming from lcd panel. Please help.. Thanks

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12129
              • U.S.
              #4
              Re: lg 50LB659 screen problem -help

              Is there caps next to the one you took out? If so it could be one of those.

                Comment

                • sangeet101
                  New Member
                  • Jan 2020
                  • 9
                  • usa
                  #5
                  Re: lg 50LB659 screen problem -help

                  Yes there were 3 but only one was beeping on continuity mode

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: lg 50LB659 screen problem -help

                      You will need to remove the cap one by one and see if the shorts will go away or not, if not then the COF may be shorted out.
                      BTW, are testing the caps on the tab bonding board without the T-CON still connected to the tab bonding boards?
                      Last edited by budm; 01-28-2020, 12:18 PM.
                      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

                        Previous template Next

                        Related Topics

                        Collapse
                        • mmccomputer
                          problem with replacing lcd screen
                          by mmccomputer
                          I have an HP model : 14-cf0011nf and I want to change its display screen (it has an original 14" full HD TN 30 pins panel) which works without problem but I want to put another screen with an IPS panel, the problem is that I tried several screens but there is no display except with the original screen, I never had this problem before I changed hundreds without problems but this PC is not 'accepted than its original screen
                          otherwise on the motherboard it displays edp and I don't know, do the panels I tried only work with the LVDS protocol?
                          If anyone has any information on the subject...
                          12-15-2024, 03:44 PM
                        • jimjoe123
                          LCD TV Green/Pink screen problem
                          by jimjoe123
                          I have a Dick Smith 37" LCD TV, Model GE6804. I am using it as PC extended monitor only.

                          Problem is while watching tv, I hear a semi loud click(like a electrical breaker tripping due to overload, just sound like it but no actual electrical overload), then screen is covered with green or pink. I can still see the original picture image but overlayed by green or pink. See attached images. Pink.jpg is what I see, and Normal.jpg is before green or pink screen, What I captured was pink screen, but about 80% of time it's green and 20% of time it's pink.

                          Then each time...
                          02-23-2020, 01:29 AM
                        • vf fa
                          EIZO CX270 - No signal but Backlight and Panel works, logo works, admin menu works. OSD doesn't. What?!
                          by vf fa
                          Hi, so i guess Iยดll have to make a new topic here, as i browsed through hundreds of other threads but couldn't find a solution to my problem yet.

                          I got a EIZO CX270 from a friend. He said it doesn't work anymore and wont display any signal or take any OSD inputs. Well, as an aspiring photographer I couldn't say no, could I? Thought it was an easy game, replace a bad cap and have a working monitor. But nooope, it wasn't supposed to be this easy.

                          So let me start with the problem description. I'll try my best not to skip anything so this might get rather long.
                          ...
                          01-31-2024, 01:40 PM
                        • valvashon
                          LG 55UH6150- trouble powering up, then half lit screen (pictures!)
                          by valvashon
                          The 55" LG has been in the basement for a few months without being used. Turned it on yesterday, set came on as it should and showed a complete screen for about 5 seconds (was on a broadcast channel but no antenna was connected), then the screen went mostly dark with about 1/3 of the screen on the right lighting up with brighter lines in that lit part (sorry, no pictures of that). Power LED was cycling too, preventing the TV from fully powering up.
                          Pulled the back off, all boards looked OK. Pulled the LED connector, turned the set on to see if it would power up but I don't belive it...
                          11-24-2024, 12:08 PM
                        • Ryan.man
                          Macbook 2017 with touchbar (A1706) won't turn on after removing the screen
                          by Ryan.man
                          Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!

                          My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.

                          This time the original cable broke too close to the screen, it can't be fixed without tearing the screen...
                          02-04-2025, 12:23 PM
                        • Loading...
                        • No more items.
                        Working...