- 64 -
LGE Internal Use Only
Copyright © 01 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
4. TROUBLE SHOOTING
26 MHzO.K?
No
Crystal is OK.
Yes
Replace X201
TP1_1 pin :
26MHz
Figure 4.2.1
y
See next page to check PLL
Circuit
X201
TP1
Figure 4.2.2
TP1
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
]_VX[^
Figure 4.2.3
Figure 4.2.2
X201
TSX-3225
26MHz
2
1
3
4
GND2
HOT2
HOT1
GND1
R213
0
2V85_VSIM
0.1u
C225
G5
F2
F3
F1
D2
D1
E2
M10
A13
B13
K14
K13
B4
A5
B5
A4
J10
USIF2_CTS_N
USIF1_TXD_MTSR
USIF1_RXD_MRST
USIF1_RTS_N
USIF1_CTS_N
DPLUS
DMINUS
XOX
XO
VSIM
SIM_IO
SIM_CLK
SIM_RST
MMCI_CMD
MMCI_DAT_0
MMCI_CLK
USB_DP
USB_DM
UART_TX
SIM_DATA
SIM_CLK
MSD_CLK
MSD_D[0]
MSD_CMD
BT_UART_TX
BT_UART_RX
UART_RX
SPI_INT
SIM_RST_N
Connect GND plane directly
Close to the 26MHz XTAL
VDDP_SIM
VDDP_MMC
EINT2
CC1CC6IO
VDDP_ULPI
RF
TP1
(1) Checking Crystal Circuit
Yes
6 MHzO.K?
Replace X01
No
Crystal is OK.
See next page to check PLL
ircuit
X201
TP1_1 pin:
26MHz
Figure 4.2.1