Device Peripheral Trouble Shooting - Asus P565 Troubleshooting Manual

f) VCC_MVT
g) SYS_EN Power Group
(VCC_MVT;VBUCK3;VCC_MVT_PLL_CORE;VCC_MVT_CLK;LDO2；LDO3)
h) PWR_EN
i) PWR_SDA,PWR_SCL
j) V_APP;V_COMM
k) 26MHz
l) OneNAND_nCS
m) SD0

2.3 Device Peripheral Trouble Shooting

(MMI Testing)
2.3.1 LCD Display Test
This test item is for LCM interface and backlight, if this item NG,
please check the following signal:
A. LCD_PWR_EN should be 1.8V
B. VCC_18V should be 1.8V
C. VCC_2.8V should be 2.8V
D. LCD_nRESET should be 2.9V
E. LCD_FCLK, LCD_LCLK, LCD_PCLK should have high-low
transaction, check if there is any
defect or open on componetR701, R702, R703.
F. LCD_DATA_EN should be 2.9V
The above signal could result in white screen, if
LCD_PWR_EN/LCD_RESET# signal is abnormal, it means CPLD is
NG. The signal LCD0 ~ LCD15 is from CPU, if the color of panel is
abnormal, please check component CON701 and CPU.
G. If there is no backlight, check the voltage on V_LED, there should be
12V. If backlight is
abnormal please check U1503 and the component around it.
華 碩 電 腦
華 碩 電 腦
GTC ■ Service Manual
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