I'm trying to repair my Dell G2410T LCD monitor. The power light turns on green but the screen is completely black. Sometimes it's just the backlight and you still see a dark image but it didn't seem to be the case.
if sometimes you got background light and no picture, then your problem is video signal path
no need to dig the LED driver for background light
green LED means the processor detected VGA signal. re-test connecting/disconnecting VGA cable or simply leave the PC in standby and move the mouse or shut dowa/start the PC, the LED should change state
IF it change state (the LED), that means processor board have at least some +5V voltage and detects VGA signal
normal repair means :
- verify voltages (at least with DMM)
- if voltages are OK and you got no scope, cut the apple in half by establishing if:
- it's the backlight LED driver defective or
- the LED background matrix
- the control board (ON/OFF from start button works, VGA signal detection works, VGA signal is correctly processed --> MAKE SURE you display on that LCD some supported
resolution/refresh rate, this is very important, you gotta setup output resolution of your device like a laptop first then connect your monitor, you can be out of monitor supported modes
range
you are a little lost in this steps, so re-focus like i proposed and rething the approach to diagnose
this 'organigram' flow works for every monitor from 1980 to today