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4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
U101
Figure 4.2.1
CIRCUIT
26MHz
X100
DSX321G-26M
4
3
1
2
EXXY0027001
1 pin
1 pin
Figure 4.2.2
LGE Internal Use Only
X100
1 pin : 26MHz
H7
NLB
USIF2_RTS_N
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
- 64 -
Copyright © 2011 LG Electronics. Inc. All right reserved.
No
Replace X100
Figure 4.2.3
Only for training and service purposes
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