Sharp LC-50UB30U 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
  • Misterfixit
    sharp LC-50LB601U No backlight
    by Misterfixit
    I have a sharp LC-50LB601U that has no backlight. It starts up fine, and has sound, however, I can only see the screen using a flashlight. I took the tv back off and measured voltages at the power supply connector CN-8601. As you can see by the picture, the led connector has 2 sets of 2 red wires and 2 sets of black wires going to the led backlights. Between each set of black wires and corresponding red wires, I measure 30 volts (pins 1 and 4) and 30 volts from pins 8 and 12. From ground to each set of red wires ( pins 1 and 12 to ground), I measure 35 volts. This voltage seems very low compared...
    04-04-2023, 01:21 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
  • Comp_Pro
    No Backlight Macbook A1990 820-01041
    by Comp_Pro
    Hello all,

    Am trying to figure out this backlight issue with this A1990 Macbook Pro.

    Tests performed:

    There is no backlight even with a good screen.
    Backlight IC is receiving the correct support voltages.
    Fuse F8400 ok
    Current sense resistor R8400 ok
    Backlight IC is receiving 3.3V on enable pin.
    Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
    Backlight IC receiving 5V from PP5V_G3S
    Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
    I2C_BKLT_SCL and I2C_BKLT_SDA both measure...
    05-06-2024, 10:23 PM
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