Flashing LED backlight on a LG 60LB650V

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • imp
    Senior Member
    • Aug 2010
    • 125
    • Sweden
    #1

    Flashing LED backlight on a LG 60LB650V

    Hi respected members of this forum,

    I've just received a LG 60LB650V LCD (PSU board EAX65423801) that has a flashing backlight. It flashes about every second with one dim flash and the second with full brightness. When the menu is showing on the screen is seems intact without any dark areas. I´ve searched for info about this and most (out of few) cases it was due to bad LED strips which needed replacement. However, my sympthom isn´t quite the same with that dim/bright/dim/bright cycling.

    Also worth mensioning is that the voltage on the connector out to the LED strips is changing accordingly with disconnected LED´s. That´s strange? All the capacitors measures fine.

    Where should I begin?

    Thanks!
    Attached Files
    Last edited by imp; 10-06-2019, 12:09 PM.
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8195
      • Canada
      #2
      Re: Flashing LED backlight on a LG 60LB650V

      It's the backlights. Here is what happens: As a start, the LED backlights are not voltage controlled, they are current controlled. So the PSU is looking for a certain current draw from the backlights. LED's can fail in a weird way, the can work fine for a few seconds, then not. Don't get distracted too much and fix what you know isn't right.

        Comment

        • imp
          Senior Member
          • Aug 2010
          • 125
          • Sweden
          #3
          Re: Flashing LED backlight on a LG 60LB650V

          Thank you CapLeaker for the info and advice, I will dismantle the TV soon and find the correct parts to replace the LED's with. It's well worth the effort and money, it's a great TV

            Comment

            • imp
              Senior Member
              • Aug 2010
              • 125
              • Sweden
              #4
              Re: Flashing LED backlight on a LG 60LB650V

              Found the problem

              Just ordered a complete set of new LED strips from Aliexpress and hopefully the TV will become as new again.

              Thanks again for a great forum with all the kind knowledgeable members!
              Attached Files

                Comment

                • tvtimmy
                  Badcaps Legend
                  • Mar 2015
                  • 1160
                  • usa
                  #5
                  Re: Flashing LED backlight on a LG 60LB650V

                  I would get some white electrical tape to cover up the burn on the plastic led cover sheet.

                    Comment

                    • imp
                      Senior Member
                      • Aug 2010
                      • 125
                      • Sweden
                      #6
                      Re: Flashing LED backlight on a LG 60LB650V

                      Originally posted by tvtimmy
                      I would get some white electrical tape to cover up the burn on the plastic led cover sheet.
                      Yup, either that or some white paint. I guess it must be reflective in some way too?

                        Comment

                        • CapLeaker
                          Leaking Member
                          • Dec 2014
                          • 8195
                          • Canada
                          #7
                          Re: Flashing LED backlight on a LG 60LB650V

                          scrub the crap out of it with 99% IPA

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • learnmore
                              Samsung QE55Q60TAUXXU - flashing backlight and flashing standy light--no image
                              by learnmore
                              Hello Community!

                              CASE DETAILS

                              Promblem Signs: Backlight on 1 sec off 7sec > repeat && Red standby light: 1blink, off 3 sec, 2 blinks, off 5 secs, 2 blinks, off 3 sec, restart cycle

                              13V present on powerboard output. Backlight continues flashing after removing cables to pannel one at a time and even with both disconnected. NOTE: backlight STOPs flashing and remains on when connector between powerboard and mainboard (note Tcon built in) is disconnected.

                              Tried inserting firmware on USB and left it in for a few hours, but no change
                              ...
                              03-03-2024, 09:49 AM
                            • HTR-Informatique
                              Dell G3 15 3500 - Battery bug (black screen and flashing keyboard backlight)
                              by HTR-Informatique
                              Hello,

                              YouTube video of the problem encountered: https://youtube.com/shorts/q7TLNv36LUo

                              I am a pro and I have a problem that I have never seen despite my 7.5 years of experience on my own and my thousands of repairs, on a customer's Dell G3 15 3500.

                              On this PC I have already changed the complete palmrest because the keyboard was no longer working properly.

                              I also changed the screen because the PC fell and the screen was broken.

                              I changed the battery with a new and original battery.

                              I also had corrosion/oxidation on the...
                              02-09-2025, 06:51 AM
                            • user546087
                              Keyboard backlight too bright - Asus Zenbook S16 / UM5606
                              by user546087
                              Hi,

                              I have a new Asus Zenbook S16, Model UM5606. Unfortunately, the keyboard backlight is too bright, even on the lowest setting. I have explored several ways now:

                              - kindly ask Asus for an adjustment - they basically told me to STFU and get lost It is not possible, they say. Of course.
                              - tint the keycaps from behind - I have already tried that - it is kind of a last resort
                              - try to find out, how it is done, look at schematics - this is, where we are at.
                              - maybe get the BIOS modified somehow? This would be the best option but I do not know a lot about...
                              02-24-2025, 02:03 AM
                            • Superbee_dad
                              Sharp 80” long short flash backlight error - Help
                              by Superbee_dad
                              Hello Sharp TV experts
                              Our Sharp LC-80LE642U displays one short one long flash error code which is a backlight error. I went into service mode and there were 8 lamp error counts recorded. I reset the count to 0 and did a reset. The last monitor error cause was 16 B00014639:12. 16 is the code for backlight error. I tried to power the tv up but went back into error mode.

                              > I checked voltages on the power supply board and they all check out .. including 3.28 volts at the error pin.
                              > There is power to the cpu and T-CONN and no faults found there. The cpu has a flashing...
                              01-24-2025, 11:51 PM
                            • STKR123
                              Elitebooks (820, 840 etc. all gens) and those continuously flashing Power LED + flashing CapsLock LED
                              by STKR123
                              As the Elitebooks (820, 840 all gens) only show flashing Power LED and flashing CapsLock (continuously) + a very soft "ticking" noise near the DC Jack,
                              I wonder if re-flashing the BIOS might be of any use here.

                              As far as I understood, steady flashing either means insufficient power or a CPU/GPU/Motherboard issue. I use the original 65watt power supply.

                              There are so many threads out there, but most of the solutions involve flashing codes, which I dont have or claim that you MUST use the original power supply, do a hard reset, reseat the RAM, clean the RAM,...
                              11-03-2024, 06:58 AM
                            • Loading...
                            • No more items.
                            Working...