Led White screen problem

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • lgf700b
    Member
    • Oct 2013
    • 16
    • Turkey
    #1

    Led White screen problem

    I have a NCL50 - LA-6121P(hannstar) motherboard. Lcd data cable was broken. So i fixed cable and checked with multimeter. Then i attached the cable and powered motherboard. Led panel is full white but external display is ok. I ordered new cable but still same. I tried with 3 different led panels but nothing changed.
    Take a look.




    Tags: None
    • lefos
      Badcaps Veteran
      • Nov 2013
      • 321
      • Greece
      #2
      Re: Led White screen problem

      Have you checked for any fuse?

        Comment

        • lgf700b
          Member
          • Oct 2013
          • 16
          • Turkey
          #3
          Re: Led White screen problem

          Yes. All seems ok. I didnt check the fuses on the panel becuse i tried 3 different panel but all of them showing white.

            Comment

            • whaldsz
              Badcaps Veteran
              • Apr 2013
              • 395
              • Philippines
              #4
              Re: Led White screen problem

              just check if you get 3.3v at +LCDVDD. Without this voltage, you will only see white screen.
              Last edited by whaldsz; 02-07-2014, 07:09 AM.

                Comment

                • lgf700b
                  Member
                  • Oct 2013
                  • 16
                  • Turkey
                  #5
                  Re: Led White screen problem

                  Originally posted by whaldsz
                  just check if you get 3.3v at +LCDVDD. Without this voltage, you will only see white screen.
                  I hardly found schematic then i found +LCDVDD pins. Voltage is showing 2.08V. Any ideas?

                  Update :

                  When i removed the cable , lcdvdd pins are giving 3.3V. I think this new cable is broken too.
                  Last edited by lgf700b; 02-17-2014, 08:26 AM.

                    Comment

                    • cyberhack
                      Badcaps Veteran
                      • Feb 2013
                      • 466
                      • Uk
                      #6
                      Re: Led White screen problem

                      Had this one the earth screening that runs in the cable is broken.

                        Comment

                        • dspok
                          Badcaps Veteran
                          • Jan 2014
                          • 553
                          • Nepal
                          #7
                          Re: Led White screen problem

                          Had experienced already that sometime VGA chip causes this problem even external display from VGA out is OK.

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • howardc64
                              A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                              by howardc64
                              Problem

                              This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                              08-04-2024, 10:36 PM
                            • ahmarzo
                              Asus la-7322p white screen problem
                              by ahmarzo
                              My asus laptop motherboard la-7322p has white screen. Have tried new screen but same problem.lcd vdd is 1.8v when i removed the mosfet an short 3vs with lcdvdd white screen is solved but no data on screen...
                              07-15-2022, 07:52 AM
                            • domu
                              Viewsonic VS16217 strange problem - white flickering screen on power up
                              by domu
                              As per subject, on power up display shows no image, but white
                              flickering screen. Strangely, it only happen after power was lost
                              when it was on. After power returns - white screen only, but if
                              disconnect power for 12-24 hrs, and connect then again monitor
                              works normally.

                              Any clues how to go about it would be greatly appreciated.
                              07-18-2023, 04:57 AM
                            • 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
                            • harp
                              White screen repairs
                              by harp
                              To ask here... I have few devices with white screen problem, actualy nokia 2220 and some fuji? camera, and try to understand what is common problem to cause that issue.
                              Yes, both devices work everything else probably ok, I mean, I hear intro melody and keypress click sound, DTMF tone, power on off... all ok.
                              On desk is nokia 2220 slide, and I check all screen connectors and components arround it, measure voltage drop, but all looks ok. I suspect on slide flex cable, but it look ok and white screen is not interupt while flexing board, pushing conectors, and sliding up down. In attachment...
                              05-13-2024, 03:43 AM
                            • Loading...
                            • No more items.
                            Working...