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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
1 pin
Figure 4.2.1
26 MHz O.K?
No
Crystal is OK.
See next page to check PLL Circuit
Yes
Replace X102
Figure 4.2.2 Figure 4.2.3
1 pin : 26MHz
X102
2V85_VSIM
G4
G2
G3
M8
A11
B11
K12
K11
B2
A3
B3
A2
J8
H7
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
0.1u
C126
26MHz
DSX321G-26MX102
21
34
SIM_CLK
BT_RXD
BT_TXD
USB_DP
USB_DM
UART_TX
UART_RX
NLB_AD25
NUB
SIM_RST
SIM_DATA
Close to the 26MHz XTAL
EINT2
CC1CC6IO
Connect GND plane directly
TP1