LG -T370 Service Manual page 64

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