Hello, I ask you for help with a laptop ASUS W7J Discrete (GF7400).
Notebook normally works on the external monitor, but do not work on the LCD. LCD panel is 100% OK, the original.



Measured values:

+3VS_LCD 0V
LCD_VDD_EN 0V
LVDS all pin 0V
AC_BAT_SYS 19V
LID_SW# 3,3V
LCD_BACKEN 3,3V
BACK_OFF# I can not find the circuit D6028

Could I ask someone where to find the D6028 on board? If the signal is not BACK_OFF#, it could be a bad South bridge?

Thank you.

Best regards chello.

it G72MG3, page 20.


No, it can not be argued. In addition to the signal BACK_OFF#, can affect the signals LCD_BACKEN And LID_SW#.

Hello, Me finally managed to find the D6028 and D6027. BACK_OFF# and LID_SW# have a 3.3 V, LCD_BACKEN have 0V, but if I can add 3.3V screen is white.
LCD_BACKEN come from G72MG3, I need will replace the circuit or look elsewhere ? Thank you all for your help.

Best Regards chello