LG 47LB67 power board EAX65424001 issue

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • shybear
    Senior Member
    • Jan 2010
    • 96
    #1

    LG 47LB67 power board EAX65424001 issue

    hi,
    This TV sometimes shut off itself surely for some bad contact of power supply board that (for use and heat) wasn't planar anymore.

    Found a same on ebay at an affordable price and compared part number and component side components was exactly the same I bought it.

    The board is perfect and new and the random shut off problem disappeared but there is a dark side on the screen that isnt' present with the old board.
    Take a look on the back of the newe power board I noticed that this one hasn't some components (4 resistors and 3 transistor) that made me suppose that it was the cause that some LED of backlight didnt' work.
    I moved one by by one this componets from the old power board to the new one testing it, but the problem still exist so I suppose there is something else to add or maybe a bridge to move.
    Actually I haven't find the power board schematic but for now I start to attach missed component pictures reference.
    Attached Files
    Tags: None
    • shybear
      Senior Member
      • Jan 2010
      • 96
      #2
      Re: LG 47LB67 power board EAX65424001 issue

      Originally posted by shybear
      hi,
      This TV sometimes shut off itself surely for some bad contact of power supply board that (for use and heat) wasn't planar anymore.

      Found a same on ebay at an affordable price and compared part number and component side components was exactly the same I bought it.

      The board is perfect and new and the random shut off problem disappeared but there is a dark side on the screen that isnt' present with the old board.
      Take a look on the back of the newe power board I noticed that this one hasn't some components (4 resistors and 3 transistor) that made me suppose that it was the cause that some LED of backlight didnt' work.
      I moved one by by one this componets from the old power board to the new one testing it, but the problem still exist so I suppose there is something else to add or maybe a bridge to move.
      Actually I haven't find the power board schematic but for now I start to attach missed component pictures reference.
      Solved: there is also to move R724 (47K) to R725 (se attachment), and now backlight works fine.
      Attached Files
      Last edited by shybear; 03-29-2023, 01:58 PM.

        Comment

        Previous template Next

        Related Topics

        Collapse
        • Soulzink
          Samsug washing machine. Power supply DC41-00189a board issue
          by Soulzink
          Hi everyone,

          I am trying to fix a samsung washinmachine power supply main board.
          I already replaced it with another one to fix the machine but i want to try understand the issue with the old board.
          Therefore i hope to be able to get some help to explain what to check in order to troubleshoot.
          The power supply board reference is the following: DC41-00189a
          I have followed one thread (https://www.badcaps.net/forum/troubl...ingmachine-rel...
          04-19-2025, 06:26 AM
        • Tynan Dill
          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
          by Tynan Dill
          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

          Upon bringing it home and plugging it up, it showed a standby light.

          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

          The screen seems to blackout and stay black, but with a flashlight I can see the display.

          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

          Assuming...
          ORIGINAL POWER SUPPLY BOARD
          7 Photos
          11-22-2024, 01:46 PM
        • notallbad
          TCL 55RP620K power board issue
          by notallbad
          Originally the tv arrived with dimmed backlights (not failed leds) but everything else worked ok. Adjusting backlight in menu did nothing but voltage changed on dimming control pins,
          0% p_dim at 1.65v and a_dim at 1v
          50% p_dim at 3.3v and a_dim at 1.65v
          100% p_dim at 3.3v and a_dim at 2.88v

          Changed backlight leds anyway as always like to have complete peace of mind they wont fail shortly after selling the tv. No change as expected!

          Leds are 2 rows of 15 6v leds.

          On inspection of the power board found diode MBR3200 shorted so replaced with...
          6 Photos
          Yesterday, 05:45 AM
        • Dani_2024
          Sceptre U550CV-UMR 4K LED, Bad Caps on Main Power Board?
          by Dani_2024
          Hi and thanks in advance for any input you might provide!
          I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
          Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO

          Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this...
          5 Photos
          10-28-2024, 05:06 PM
        • sam_sam_sam
          Panasonic switching power supply daughter board has two 27uf @ 50 volt capacitors which I do not keep in stock
          by sam_sam_sam
          I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow

          This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board

          After all of...
          07-13-2024, 08:14 PM
        • Loading...
        • No more items.
        Working...