[SOLVED]820-3330 no backlight


New member
got a 3330 with 10.5v on both sides of the backlight fuse. the screen makes a little difference in lighting when powering on and off but the backlight does not come on. i can see the options menu when i put a light up to it. tried a different test screen and same thing. swapped out u9701 and have 3.3v on blk_en and 3.5v on PWM, do you think this could be the gpu?


What is the option menu ? Did you try to fully boot and log in ? If not then try as that can bring the backlight back.


Staff member
Do PRAM reset first.
Post resistance to ground and voltages too on both sides of D9701. Also check if diode is not shorted.
What you have on Q9707, pins 2 & 5?
Measure all voltages with LCD connected.