Testing for a Broken Screen?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • SLK001
    Badcaps Veteran
    • May 2014
    • 264
    • USA
    #1

    Testing for a Broken Screen?

    Does anyone have a way to test for a broken LCD screen prior to purchase? I'm talking about TVs that have died on the previous owner and they are selling it for a song. Of course, the TV doesn't power-on, so that way is out.

    I purchased a Samsung 40" that was supposed to be okay (except it didn't power on). After fixing the power supply (capacitors) and firing the thing up, there was a crack across the screen. I've tried various ways of looking for a cracked screen, but I have succeeded with none of them.

    I've just been chalking the bad ones up as "you win some, you lose some". I like to sell whole TVs locally, as I don't want to deal with the people who claim that I sold them a board that doesn't work (the "skeet" shooters).
    Tags: None
    • japlytic
      Badcaps Legend
      • Oct 2005
      • 2086
      • Australia
      #2
      Re: Testing for a Broken Screen?

      I find using a bright torch can often reveal breaks in the panel - unfortunately, this technique not work on true LED panels (aka AMOLED/Retina).
      But detecting LC material loss is a bit difficult (before the LCD displays anything) in my experience.
      My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

        Comment

        • ecking767
          Badcaps Veteran
          • Oct 2009
          • 492
          • USA
          #3
          Re: Testing for a Broken Screen?

          the good old sun light !! I will carry the TV outside and let the sunlight shine onto the LCD screen facing up to toward the sky. you may need two person to do this.

          you live in the sunshine state, me too !!

            Comment

            • Alastair E
              Chief Womble
              • Mar 2013
              • 1963
              • U.K.
              #4
              Re: Testing for a Broken Screen?

              Spraying a little glass-cleaner on the screen plus a good light shows up most busted screens...
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                • johns1mj
                  Badcaps Veteran
                  • May 2015
                  • 242
                  • United States
                  #5
                  Re: Testing for a Broken Screen?

                  I have not found a way yet. I usually buy them for less then the interior boards are worth. If I can fix it great if it is a bust then I can break even with parts sales.

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • 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
                    • reformatt
                      Macbook Air M2 A2681 Kernel panics after screen replacement
                      by reformatt
                      Just had a customer bring in a M2 MBA A2681 that had had a screen replacement in April at another repairer. Since then, she has been getting intermittent kernel panics. It's an aftermarket screen, and of course it fails in diagnostics as the calibration hasn't been done. The error in the panic log is "No device added after powering on the rails".

                      It seems the original repairer has swapped the board and the screen to other MAC's, and said that it isn't a screen issue. From what I understand, by doing a quick search on Google, this is in fact a screen issue. The panic relates...
                      07-31-2025, 08:37 PM
                    • smic717394
                      iphone XS turns off when press on screen.
                      by smic717394
                      Hi,

                      I have a iphone XS that came in for a screen replacement, the screen was badly cracked, and inside missing scues, on the back of the screen still the blue protector, the screen was a LCD. So we replaced the screen and all good, installed the screen and we noticed that pressing the screen with a bit of force but not excessive, the phone dies. After plugging the charger it turns back on, but again if you press it it dies. I open the phone again, and I can't see anything major, with the phone open, if I press on the logic board, battery, charging board, or even putting pressure on...
                      07-25-2024, 10:16 AM
                    • BlueNitesFire
                      I need Lenovo yoga 6 13ARE05 bios- broken screen and no bright light on keyboard
                      by BlueNitesFire
                      So I couldn't remember my bios password and since it was broken screen, I used to connected to the TV via Type C to HDMI. So I decided to remove the Bios chip and reprogram the Bios chip with ch314a.. when I try to solder Bios on the laptop, one of the Bios leg broke off.. I bought a new blank Bios chip so I can programmed by flashing on the bios.
                      2 Photos
                      03-08-2025, 03:49 PM
                    • Dancauac
                      820-01598 EDP cable was disconnected whist testing new screen. No image, no backlight
                      by Dancauac
                      MBP2019 A2159 Board 820-01598

                      Hi Everyone! My very first question and ask for help! Thanks in advance!!!
                      I was testing the new screen on this MBP but the time I was maging to turno the mac over, the EDP cable got loose.
                      I disconnected the power, reconnect de EDP cable, holding with screws the screen this time.
                      Turns on fine, everything works fine, but no image (I used the flashlight) and no backlight at all.

                      Done SMC and PRAM reset. Nothing changes.
                      Tested other functional aftermarket and original screens. Nothing changes.
                      Don´t...
                      03-29-2023, 02:38 PM
                    • Loading...
                    • No more items.
                    Working...