LG 50LN5750 backlight issue

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  • 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
  • Cornito
    Thomson 50UD6306 (TCL) Backlight Issue, starts then stops, led changed
    by Cornito
    Hello Team,

    I'm back with another backlight issue that I thought was simple, but it turned out to be more complex than expected.

    Let me provide a brief history: The TV was working well, then one day, the backlight started and shut down. I thought I had an LED issue leading to this behavior, so I replaced the LEDs with brand new ones. However, the issue remains the same.

    Next, I replaced the electrolytic capacitors attached to the LED power supply, but the results were the same. I then replaced the driver, a OB3365RP, and did it twice due to the same result....
    08-08-2024, 08:09 AM
  • cheebster
    iPad Pro 12.9 5th Gen Backlight Issue
    by cheebster
    Hello, got an iPad Pro A2378 12.9 5th gen with no backlight. Got another test unit without screen, tested the screen, still no backlight with the test unit.
    Figured out the backlight on the screen was bad, ordred a new backlight from mobilesentrix, *carefully replaced it* without damaging the lcd, oh well.
    Final result, issue is still there, the screen has no back lights. So i'm back to square one, with 3 hours less and 100$ out, issue still on the screen.
    The panel is still ok, i can see the apple in the middle of the screen when it kicks in, just no backlight.
    Anyone...
    05-20-2025, 09:17 AM
  • Acnologia
    Lenovo Thinkpad T540P - Showing at 14" inch but NOT at 15.6" inch (Backlight issue) ?
    by Acnologia
    Hello to all members of badcaps.

    Another brainstorming that i have been messing with for months as a side project.
    Bought a T540p , from eBay as 'doesn't display' ,so i thought it was either backlight fuse, or screen issue etc.

    I got it in my hands, first thing, the machine works fine boots to windows , in external screen all diagnostic are good.
    Step 1.
    Change screen (FAT - LED ) 1366x768 to 2nd one, that i know 1000% that is working ,as it has been tested.
    Machine > Doesn't give display it's really dim.
    Step 2.
    Use the same...
    11-05-2025, 04:02 AM
  • shellybelly
    Razer Blade 2016 6700k 1060 RZ09-01952 suspected backlight power rail issue.
    by shellybelly
    Back Story
    I just recently purchased a RZ09-01652 Razer Blade 14 Touch v4(2016) as a project. I suspect the original motherboard had overheated and caused board damage to the vrm's for the CPU and GPU as now that motherboard works however will lockup on you often due to hardware clock issues.
    So after some research and looking at options for replacement motherboards I got a replacement RZ09-01952 razer blade 14 motherboard which has the 1060 vs the 970m that was in my original motherboard. I have contacted the seller about the motherboard being bad however I doubt they will be...
    08-27-2023, 10:40 PM
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