LG 49lf510V no backlight

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  • 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
  • Misterfixit
    Sharp LC-58Q7330U No Backlight
    by Misterfixit
    This set has the known reputation of failed led backlights. The set does not turn on, but when plugged in, the power led stays lit for about 5 seconds followed by two short blinks and then it repeats itself. While shinning a flashlight on the screen, you can make out the Sharp logo, then it goes out and repeats the cycle. I measured some voltages across the led backlight connector. What has me puzzled is that when I place the negative lead of my vom on the led backlight pin connector (in which the black wire going to the leds was), I measure as high as -228volts, and then it falls to -95 volts...
    06-04-2023, 07:39 PM
  • triplefour
    TCL 75S421 has sound but no backlight not even a flash
    by triplefour
    TCL 75S421
    PSU BOARD: 40-L402H8-PWD1CG
    it shows not even a flash of backlight when powering up.
    but the tv appeas to turn on and i can hear the sound of the menus moving and clicking. i can power down the tv with the button.
    testing the backlights with my tester all 4 strings lit up and showed similar voltage drops. around 110 or so.
    unplug mb and leave only psu plugged into backlights (PSU + BL SELF TEST MODE?) does not light the backlights.
    i do see 24v but 0v on PSON and BLON (i didnt write this down tho so cant be sure)
    with mb connected, PSON...
    11-17-2023, 09:54 PM
  • DanPoka
    Guide me through repairing a Dell p2210f LCD ccfl backlight monitor
    by DanPoka
    I bought this p2210f dell monitor to fix. Schematic is the same as p2210.
    Behaviour is that monitors comes on but then backlight switches off almost instantly. If I look with flashlight I can still find the "No signal message". So definitely a backlight issue. Trying to advance the issue I proved that the protection circuit is switching off the backlight by shorting out C3 and resistor to disable the INL chip then re enable by removing the short.
    This is where it gets interesting. When I disassembled the monitor to solder leads on c3 capacitor I noticed the backlight flickered...
    02-15-2025, 05:05 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
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