Led - Asus P526 Service Manual

5.9 LED

Needed Equipments:
A. Power supply set to 4V/2A.
B. Oscilloscope
Note: You can run LED test of MMI test program and LEDs (red, blue and green) will be
sequentially flashing or use following behaviors to check them.
a. The red LED shall light if AC charger is plugged. Pin#4 of U21 (PWM_MLPG1_GREEN_RED)
shall be high (2.8V) and pin#6 of U21 (GP145_PWM_RED_GREEN#) shall be high (2.8V).
R267 (NO_RED) shall be high (2.8V). Pin#6 of Q6 shall be low.
b. The green LED shall be flashing if phone camp to base station of GSM system. Pin#4 of U21
(PWM_MLPG1_GREEN_RED) shall have PWM signal and pin#6 of U21
(GP145_PWM_RED_GREEN#) shall be low (0V). R26 (NC_GREEN) shall have PWM signal.
c. The blue LED shall flashing, if BT (blue tooth) is working. Pin#1 of R162
(PWM_MLPG2_BLUE) shall have PWM signal and pin#3 of Q8 shall have PWM signal too.
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