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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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(1) Checking Crystal Circuit
4. TROUBLE SHOOTING
TEST POINT
CIRCUIT
WAVEFORM
CHECKING FLOW
TP1
Figure 4.2.2
Figure 4.2.3
Figure 4.2.1
TP1_1 pin :
26MHz
X101
26 MHz O.K?
No
Crystal is OK.
See next page to check PLL Circuit
Yes
Replace X101
(TP1)
TP1
0.1u
C128
H6
H2
H3
H1
G4
G2
G3
M8
A11
B11
K12
K11
B2
A3
B3
A2
J8
H7
J7
H8
USIF2_TXD_MTSR
USIF2_RXD_MRST
USIF2_RTS_N
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
2V85_VSIM
X101
TSX-3225
26MHz
2
1
3
4
GND2
HOT2
HOT1
GND1
USD_D0
NLCD_RESET
UART_RX
UART_TX
USB_DM
USB_DP
BT_TXD
BT_RXD
BT_RTS
BT_CTS
SIM_RST
SIM_DATA
SIM_CLK
USD_CMD
USD_CLK
CHG_EN1
Connect GND plane directly
Close to the 26MHz XTAL
TP1
Содержание LG-A130
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