dim backlight and flicker

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  • triplefour
    UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
    by triplefour
    this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
    i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
    unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
    according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
    09-13-2023, 10:43 PM
  • hollox123
    ASUS ROG Strix G713QR - Keyboard, backlight and side LEDs don't work
    by hollox123
    Hello, I have an "ASUS ROG Strix G713QR" laptop, and for approx. 3 months I have the following problems:

    1. Laptop keyboard doesn't work
    2. The backlight on the laptop keyboard doesn't work
    3. The x2 side LEDs (red) on the laptop don't work

    The power button works, the touchpad works, and all the USB, HDMI, Ethernet, etc. ports work.

    I already tried to reinstall all the drivers and reinstall Windows. So I don't know what to try anymore that is software-related.

    But I am strongly aiming that it is somehow a BIOS-related problem,...
    05-11-2025, 08:05 AM
  • snowphish
    DJI FPV goggles, dead backlight
    by snowphish
    I have a pair of DJI FPV Goggles v2 that the backlight on one side LCD screen does not light up. Obviously I have tried already to switch screens and ribbon connectors, it's not that. I've inspected things under a microscope and can't see anything wrong with the connector or otherwise.

    This is the pinout of the LCD - and I am reading about 35v on LED anode on one side and lower 30V on the non-working side, but this is without the LCDs connected.

    Now there's no information on these boards, it's using a proprietary CPU - I've been trying to pinpoint where the backlight...
    04-30-2024, 10:43 AM
  • signal.quest
    Panasonic LED TV TC-40A420U - Replaced Backlight LEDs but now no image/display or garbled
    by signal.quest
    I have a Panasonic LED TV TC-40A420U. The TV was given to me as an attempt to fix or throw out. I replaced the Backlight LEDs and now the screen lights up, but there is no image/display. If I play with the up/down buttons I can get the display to change from black to garbled. I can't get sound from HDMI but not sure of what input is selected. I have no remote control. When I connect a laptop to the HDMI ports it recognizes a Panasonic TV for display and sound output but I can't see or hear anything through the TV. This makes me think the mainboard is OK, but not sure if mainboard can...
    03-17-2024, 10:14 AM
  • cheeseandjamsandwich
    Backlight dead on ThinkPad P51 20HH?
    by cheeseandjamsandwich
    Hi all,

    I have my Lenovo ThinkPad P51 20HH laptop with a dead backlight.
    It's a Xeon E3-1505M v6

    The picture is visible on the panel with the help of a flashlight. So it's looking like the backlight is dead i guess...?

    I've tested the one fuse next to the 40-pin on the MB that i can find, and that hasn't blown, it has continuity... So i'm wondering where else it has fuses? Or what else it could be?

    I sadly didn't get photos when I've had it opened. And it's busy processing photogrammetry stuff at the moment. As it's otherwise...
    09-16-2021, 12:04 PM
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