Microsd Test; Led Test - Asus P552W Manual

2.3.5 MicroSD Test

If the device is unable to read SD storage card, try to replace the
device with new a sub-board and perform the test again. If the defect
is still not solved, please follow the following debugging procedure:
A. Please verify if sub board(MicroSD board) and main board is
connected properly.
B. Please verify if CON1201 is defective.
C. Please verify if MMC_PWR_EN = 1.8V (On the sub board.) If not,
make sure that sub board and
main board BTOB connector are not defective.
D. Please verify if VCC_MMC = 2.9V(on the sub board) If not, it is
likely that U4 is defective

2.3.6 LED Test

` Two type of LED are tested here. One is the RGB LED, the other
one is the Keypad LED. If the RGB LED is not functioning properly,
please follow the following debugging procedure:
A. Verify if R1353, R1354, R1356 is defective.
B. Verify if LED 1301 is defective.(By using the volt mete)
C. Verify if voltage level of 2.8V can be measured at B_LED, R_LED,
G_LED. If not, it is likely that the
CPLD is defective.
華 碩 電 腦
華 碩 電 腦
Figure 1.3 microSD Power
GTC ■ Service Manual
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