Service manual

GTC Service Manual
ASUS Proprietary 21
華
華
碩
碩
電
電
腦
腦
4.9
4.9 4.9
4.9 Keypad Test
Keypad TestKeypad Test
Keypad Test
Keypad is constructed by board-level test and assembly test.
4.9.1 Board level test:
Check SMT issue and detect the each rows and columns function on
the keypad matrix via driver IC.
The pathway from driver IC to CPU via I2C protocol should be OK. We
can use specify key group to verify the result.
The purpose of the assembly test:
Keypad FPC and Touch Feeling operated by end user. All of the
buttons need be pressed.
4.9.2 External Keypad
We will use those functions on the U5 I/O controller IC from
LCD_PCB. If you can feel the button has pushed after the function
can not executed. Please check the signal KPD_INT# and the
signal of the U5 by oscillate scope.
Figure 16. Keypad controller circuit( On LCD_PCB board)