Weird Custome Built 55" LED Monitor

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • Michale32086
    New Member
    • Nov 2011
    • 1453
    • USA
    #1

    Weird Custome Built 55" LED Monitor

    Got a weird one in..

    It's a custome built 55" LED Monitor.. Just has DB15 and DVI hookups..

    I push the power button and the LED Power Light goes GREEN, then RED after a few seconds.. After a min or so, the Power LED starts blinking red...

    There were some loose pads on the TRACE side of the Power PCB. I fixed those and still have the same problem..

    All the other components on the Power PCB and the "Main" video board look OK..

    Voltages look OK.. I get around 175V steady on the LED connector

    At this point, I am leaning towards a bad LED Strip, but I want to exhaust all other possibilities before I break it down that far...
    Attached Files
    Tags: None
    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: Weird Custome Built 55" LED Monitor

      It gives the led driver voltage on the board but I can't read it. Have you applied a signal. Some computer monitors turn off if no signal present.
      Willing to help but I'm no expert.

        Comment

        • Andrew F. Ali
          Badcaps Legend
          • Jan 2014
          • 2450
          • Trinidad & Tobago
          #3
          Re: Weird Custome Built 55" LED Monitor

          The Backlight LED strips seem to be connected in parallel and what you are seeing is perhaps an open string . Measure WRT GND the -ve pin voltage as you said you have 175V on the +ve pin.

            Comment

            • Michale32086
              New Member
              • Nov 2011
              • 1453
              • USA
              #4
              Re: Weird Custome Built 55" LED Monitor

              Originally posted by dick_barton
              It gives the led driver voltage on the board but I can't read it.
              These help???

              Have you applied a signal. Some computer monitors turn off if no signal present.
              ACK!!!! Good point!!!!

              Lemme do that..
              Attached Files

                Comment

                • R_J
                  Badcaps Legend
                  • Jun 2012
                  • 9535
                  • Canada
                  #5
                  Re: Weird Custome Built 55" LED Monitor

                  If you have 175 volts across the led leads going to the panel the led's should light up unless the circuit is open, open led or open connection on a plug etc.

                    Comment

                    • Michale32086
                      New Member
                      • Nov 2011
                      • 1453
                      • USA
                      #6
                      Re: Weird Custome Built 55" LED Monitor

                      OK It does appear the be the backlight issue.. The LED Power light goes green and I can see a latent image on the screen from a laptop...

                      Andrew, can you simplify the WRT GND -ve thing??? Am a little slow this morning.

                        Comment

                        • Andrew F. Ali
                          Badcaps Legend
                          • Jan 2014
                          • 2450
                          • Trinidad & Tobago
                          #7
                          Re: Weird Custome Built 55" LED Monitor

                          WRT GND.....With Respect To Ground....The RED lead on the -ve pin and the BLACK lead to chassis ground.....to check if you have return voltage to the Driver....NP (No Problem)

                            Comment

                            • Michale32086
                              New Member
                              • Nov 2011
                              • 1453
                              • USA
                              #8
                              Re: Weird Custome Built 55" LED Monitor

                              Originally posted by Andrew F. Ali
                              WRT GND.....With Respect To Ground....The RED lead on the -ve pin and the BLACK lead to chassis ground.....to check if you have return voltage to the Driver....NP (No Problem)



                              0v or, more accurately, .003mV
                              Attached Files

                                Comment

                                • Michale32086
                                  New Member
                                  • Nov 2011
                                  • 1453
                                  • USA
                                  #9
                                  Re: Weird Custome Built 55" LED Monitor

                                  Originally posted by R_J
                                  If you have 175 volts across the led leads going to the panel the led's should light up unless the circuit is open, open led or open connection on a plug etc.
                                  Yea, it's beginning to look like I may have to crack this puppy open..

                                  Not looking forward to that...

                                  On the plus side, I don't have to take off the plastic backing or the front bezel.. There is none.

                                    Comment

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales
                                      #10
                                      Re: Weird Custome Built 55" LED Monitor

                                      Yes it ls looking like a possible led fault. If you measured Vled at 170V and the panel says 108 - 120V then it's probably the open circuit voltage.
                                      Willing to help but I'm no expert.

                                        Comment

                                        • Michale32086
                                          New Member
                                          • Nov 2011
                                          • 1453
                                          • USA
                                          #11
                                          Re: Weird Custome Built 55" LED Monitor

                                          OK Well, at least I know it's likely the problem.. OK Cracking it open after lunch...

                                          Thanx for all the replies...

                                            Comment

                                            • Michale32086
                                              New Member
                                              • Nov 2011
                                              • 1453
                                              • USA
                                              #12
                                              Re: Weird Custome Built 55" LED Monitor

                                              That did it.. It was a bad LED strip.. Found a replacement that I could wire in and we're all good.

                                              Using those suction handles makes taking off the largest panel a breeze.. I kick myself that I didn't get these sooner...

                                              Thanx to all for all the help...

                                                Comment

                                                • dick_barton
                                                  Badcaps Legend
                                                  • Aug 2015
                                                  • 6642
                                                  • Wales
                                                  #13
                                                  Re: Weird Custome Built 55" LED Monitor

                                                  Always nice to have a happy ending.
                                                  Willing to help but I'm no expert.

                                                    Comment

                                                    • Andrew F. Ali
                                                      Badcaps Legend
                                                      • Jan 2014
                                                      • 2450
                                                      • Trinidad & Tobago
                                                      #14
                                                      Re: Weird Custome Built 55" LED Monitor

                                                      Good job.

                                                        Comment

                                                        • Michale32086
                                                          New Member
                                                          • Nov 2011
                                                          • 1453
                                                          • USA
                                                          #15
                                                          Re: Weird Custome Built 55" LED Monitor

                                                          Originally posted by dick_barton
                                                          Always nice to have a happy ending.
                                                          "Indeed"
                                                          -Teal'c, STARGATE SG-1





                                                          Originally posted by Andrew F. Ali
                                                          Good job.
                                                          Danke..

                                                            Comment

                                                            • SLK001
                                                              Badcaps Veteran
                                                              • May 2014
                                                              • 264
                                                              • USA
                                                              #16
                                                              Re: Weird Custome Built 55" LED Monitor

                                                              Originally posted by Michale32086
                                                              That did it.. It was a bad LED strip.. Found a replacement that I could wire in and we're all good.

                                                              Using those suction handles makes taking off the largest panel a breeze.. I kick myself that I didn't get these sooner...

                                                              Thanx to all for all the help...
                                                              Are you referring to the Harbor Freight dual suction cup lifters we discussed earlier?

                                                                Comment

                                                                • Michale32086
                                                                  New Member
                                                                  • Nov 2011
                                                                  • 1453
                                                                  • USA
                                                                  #17
                                                                  Re: Weird Custome Built 55" LED Monitor

                                                                  Originally posted by SLK001
                                                                  Are you referring to the Harbor Freight dual suction cup lifters we discussed earlier?
                                                                  I am indeed.. They are a godsend!!! I bought 2 sets, the orange singles and the red duals.. I have used the orange singles exclusively as the panels I have been moving are 50" and lower.. I am wary about the red ones because the suction is pretty intense. But will likely use them on my next 70" +...

                                                                    Comment

                                                                    • Andrew F. Ali
                                                                      Badcaps Legend
                                                                      • Jan 2014
                                                                      • 2450
                                                                      • Trinidad & Tobago
                                                                      #18
                                                                      Re: Weird Custome Built 55" LED Monitor

                                                                      A 'must have' tool when doing Panel backlight issues.

                                                                        Comment

                                                                        • Michale32086
                                                                          New Member
                                                                          • Nov 2011
                                                                          • 1453
                                                                          • USA
                                                                          #19
                                                                          Re: Weird Custome Built 55" LED Monitor

                                                                          Originally posted by Andrew F. Ali
                                                                          A 'must have' tool when doing Panel backlight issues.
                                                                          Yea, when I think back on all the TVs I could have saved had I had these...



                                                                          Especially that REALLY nice 70" 4K Ultra HD....

                                                                          Oh well, we go on...

                                                                            Comment

                                                                            • Andrew F. Ali
                                                                              Badcaps Legend
                                                                              • Jan 2014
                                                                              • 2450
                                                                              • Trinidad & Tobago
                                                                              #20
                                                                              Re: Weird Custome Built 55" LED Monitor

                                                                              That's for sure!!

                                                                                Comment

                                                                                Previous 1 2 template Next

                                                                                Related Topics

                                                                                Collapse
                                                                                • momaka
                                                                                  HannStar Hanns-G HC194d LCD monitor repair
                                                                                  by momaka
                                                                                  Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
                                                                                  03-15-2023, 10:17 PM
                                                                                • wattage
                                                                                  AOC AG493UCX 49-inch monitor - Firmware request
                                                                                  by wattage
                                                                                  Hello Badcaps Community,

                                                                                  I purchased a preowned AOC monitor that is not working and out of warranty. It was sold as not working. I am looking for guidance on self-repair. In particular, I am after the firmware for the monitor. At the end, I have included monitor model information and links to pics and vids of the issue.

                                                                                  The problem is that it will not display a picture on any of its inputs. And the on-screen menu does not appear. The power button works properly. It powers on with the remote as well. But the on-screen menu does not appear, even when not connected to any...
                                                                                  Today, 04:41 PM
                                                                                • Ifixstuff9
                                                                                  Dell SE2416h monitor power cycles - very weird behavior
                                                                                  by Ifixstuff9
                                                                                  Hello all,

                                                                                  I have a dell SE2416h monitor that power cycles at somewhat random intervals. When the monitor is first powered on after being off for a few hours, it lasts 15-30 mins before the first power cycle. After that, the cycles progressively get more frequent until the monitor cycles every few seconds.

                                                                                  I'm not sure what is causing this, but maybe something is overheating, causing the monitor to shut off? That would explain why it gets worse with time.

                                                                                  Now here is where things get weird (at least to me, this might be some some common symptom I've...
                                                                                  04-20-2019, 07:03 PM
                                                                                • ant3202
                                                                                  HP 27es - LED monitor - Monitor Flashing On - Off
                                                                                  by ant3202
                                                                                  Hi Everyone

                                                                                  Lately I am experiencing the deja-vu incident on one of the led monitor like this.
                                                                                  https://www.badcaps.net/forum/troubl...lashing-on-off

                                                                                  The monitor is HP 27es LED Monitor
                                                                                  https://h30434.www3.hp.com/t5/Deskto...e/td-p/6804692

                                                                                  The monitor will randomly blackout and display no signal and will recover again.
                                                                                  Sometimes need to power and off again to restore the display but...
                                                                                  03-20-2025, 07:30 PM
                                                                                • Rick_1234
                                                                                  LG 23MP55HQ LED Monitor turns off after a few seconds or flickers.
                                                                                  by Rick_1234
                                                                                  Good evening, gentlemen.

                                                                                  I have a problem with my monitor. It turns off after a few seconds or flickers. Shining a flashlight on the screen doesn't show any image, so I guess it's not the "2 seconds to dark" I read in the forum.

                                                                                  To turn it back on, I have to press the power button twice. Then after a few seconds it turns off again or flickers. See video.
                                                                                  https://drive.google.com/file/d/1L6S...ew?usp=sharing


                                                                                  Things I tried

                                                                                  - Bought a new AC adapter thinking that was the problem but the problem...
                                                                                  06-22-2024, 04:44 PM
                                                                                • Loading...
                                                                                • No more items.
                                                                                Working...