820-00923-A

[Soji]

This board displays fine but when it goes to sleep or close the lid there won't be backlight anymore...
I have tested with known good screen but problem still persist and no corroded area or component on the board..

 

[2informaticos]

Inspect J5250/60 for corrosion.
Check HALL_SENSR_LEFT/RIGHT signals, with lid closed/open.

 

[Soji]

No corrosion at J5250/60
Lid open HALL_SENSR_LEFT =3.4V
HALL_SENSR_RIGHT=0V
Lid closed HALL_SENSR_LEFT=3.4V
HALL_SENSR_RIGHT=0V

 

[2informaticos]

HALL_SENSOR_LEFT/RIGHT both signal must be high when lid id open and 0V with lid closed.
Working with the board alone on the desk, you can use small magnet to simulate lid action.

Does right sensor (J5260) get 3V?

 

[Soji]

Where should i place the magnet to simulate lid action

 

[2informaticos]

Aproach it to the Hall sensors (J5250/60).

 

[Soji]

Still the same with board alone on desk
HALL_SENSR_LEFT =3.4V
HALL_SENSR_RIGHT=0V
After I approach magnet to j5260

 

[2informaticos]

Approaching the magnet can only drop the voltage; at least left Hall sensor (J5250).
Your right Hall sensor (J5260) is bad, unless it doesn't get 3V3_G3H; which you didn't confirm yet.

 

[Soji]

Should I change j5260 or how can i check if it gets 3V3_G3H

 

[2informaticos]

You can scrub the resin on top and check for 3V on its chip.

 

[Soji]

 

[Soji]

There is no 3volts on it ..
I found 0.362 diode mode to ground on one of the peel pads which i think the resistance is for 3V3_g3h

 

[2informaticos]

Change that sensor module.
You can try to run 1-2 wires from the chip to corresponding points on the MLB.

 

[Soji]

I changed J5260 it now works
Thanks...