Samsung 740N power problem

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  • mrtek
    Samsung UN43NU6950FXZA No power
    by mrtek
    Hi

    Picked up another TV. Samsung UN43NU6950FXZA. No power and no standBy led on. Removed back cover and:
    Main fuse = OK
    Back light LED = OK. Power them with aux power source
    LED output = OK 156V
    I do get 12 V DC out of the power supply going to the digital section but no 5V or 3.3V. PS_on voltage is only 1.8V. I have looked everywhere on the PCB , I could not find i reference for 5V output.
    Also removed connections to panel, speakers and remote but no luck. One strange thing is that even with the LED power supply working, backlight LED do not turn on...
    Yesterday, 08:06 PM
  • theone111
    Problem with LG Plasma 60PM6700 - Random power downs
    by theone111
    I have an LG Plasma TV 60PM6700 for the past ~12 years.

    In the last ~3-4 months I have been having some issues.
    1. Problem: It started with random picture disappearing (sound still worked).
      Frequency: Happened about once a week.
      Solution: Had to turn off TV wait a few seconds before turning it on again.
    2. Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
      Frequency: Happened about once a week.
      Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve.
    3. Problem: TV shuts down
    ...
    07-22-2024, 10:36 AM
  • Duranitron
    Asus x512dk rev 2.1 power on problem
    by Duranitron
    When I reflash again the bios of hoaca388 the unit powers on and the unit lives!!! Hooray!! All voltage in the coil 3.3v, 5v and 6.7v indicate charging are all present. including the cpu voltage , EEPROM and GPU voltage the unit is now alive, normal screen booting to windows and log in screen until I power it off. Then the unit never goes on even when pressing the power button in the keyboard.. Voltage reading 19v main , 3.3v VCC in IT8225E-128 and EEPROM VCC 0 volt and the charging voltage 0 volt.

    Try to trace the power switch button goin to the power switch IC PU8803 (APL3533AQBI-TRG)...
    11-26-2024, 10:22 PM
  • CptChronic
    Samsung LU32J590UQUXEN Monitor display problem
    by CptChronic
    I have an intermittent display problem with my monitor, when I plug in the HDMI cable to my (or any) laptop, you see the connection screen shrink on the laptop as it usually would before displaying on the monitor but 95% of the time the monitor display stays black.

    Before it cut out all together, tapping the monitor control button a fair few times would make the screen display, and everything work fine.

    But now it never does it. Not sure what's going on, hoping someone can help. I'm capable of stripping the thing down and soldering in new parts if needed, or programming...
    04-24-2023, 04:33 PM
  • usbdevice
    Acer X223HQ (Version Bbd) on/off-power-cycling
    by usbdevice
    Hi all

    There's two other threads about this monitor with seemingly the same problem. The problem was resolved in one case by replacing the entire PSU board and in the second one by replacing an unknown IC.

    https://www.badcaps.net/forum/showthread.php?t=50657
    https://www.badcaps.net/forum/showthread.php?t=40512

    The first one has pictures of the pcbs and I noticed that there's one IC and assorted caps not populated on mine (but the PCB itself looks identical) so I thought that'd warrant a new thread.

    It's my dad's old monitor. He...
    08-05-2022, 02:21 AM
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