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(1) Checking Crystal Circuit
TEST POINT
Figure 4.3.1
CIRCUIT
Connect GND plane directly
Close to the 26MHz XTAL
X102
DSX321G-26M
4
3
1
2
26MHz
TP1
TP1
Figure 4.3.2
LGE Internal Use Only
X102
TP1_1 pin :
26MHz
J8
NUB
USIF2_CTS_N
A2
UART_TX
USIF1_TXD_MTSR
B3
UART_RX
USIF1_RXD_MRST
A3
BT_RXD
USIF1_RTS_N
B2
BT_TXD
USIF1_CTS_N
K11
USB_DP
DPLUS
K12
USB_DM
DMINUS
B11
XOX
A11
XO
4. TROUBLE SHOOTING
CHECKING FLOW
26 MHz O.K?
Yes
Crystal is OK.
See next page to check PLL Circuit
WAVEFORM
Figure 4.3.3
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Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
No
Replace X102
TP1
Only for training and service purposes
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