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(1) Checking Crystal Circuit
TEST POINT
TP1_1 pin :
Figure 4.3.1
CIRCUIT
Connect GND plane directly
Close to the 26MHz XTAL
X101
TSX-3225
4
3
GND2
HOT2
1
2
HOT1
GND1
26MHz
2V85_VSIM
TP1
C128
0.1u
TP1
Figure 4.3.2
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
X101
26MHz
H8
BT_TXD
USIF2_TXD_MTSR
J7
BT_RXD
USIF2_RXD_MRST
H7
BT_RTS
USIF2_RTS_N
J8
BT_CTS
USIF2_CTS_N
A2
UART_TX
USIF1_TXD_MTSR
B3
UART_RX
USIF1_RXD_MRST
A3
NLCD_RESET
USIF1_RTS_N
B2
CHG_EN1
USIF1_CTS_N
K11
USB_DP
DPLUS
K12
USB_DM
DMINUS
B11
XOX
A11
XO
M8
VSIM
G3
SIM_DATA
SIM_IO
G2
SIM_CLK
SIM_CLK
G4
SIM_RST
SIM_RST
H1
USD_CMD
MMCI_CMD
H3
USD_D0
MMCI_DAT_0
H2
USD_CLK
MMCI_CLK
H6
4. TROUBLE SHOOTING
CHECKING FLOW
26 MHz O.K?
(TP1)
Yes
Crystal is OK.
See next page to check PLL Circuit
WAVEFORM
Figure 4.3.3
70/136
70/140
70/140
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4. TROUBLE SHOOTING
No
Replace X101
TP1
LGE Internal Use Only
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