LG -A270 Service Manual page 44

(1) Checking Crystal Circuit
(1) Checking Crystal Circuit
BPI_BUS2
Figure 4.2.1
BPI_BUS3
LGE Internal Use Only
LGE Internal Use Only
TP1 (X100 1pin)
TP1 (X100 1pin)
RF_TX_EN
N15
RF_VLOGIC
E16
TEST1
D17
TEST2
F16
TEST3
E17
TEST4
A13
TXO_HB
RF_HB_TX
B13
TXO_LB
RF_LB_TX
G17
XTAL1
G16
XTAL2
P1
XIN
Figure 4.2.2
TP1
TP1 (6 MHz)OK?
Crystal is OK.
TP1 (26 MHz)
See next page to check PLL Circuit
OK?
Yes
Crystal is OK.
See next page to check PLL Circuit
TSX-3225 X100
3
HOT2 GND2
2
GND1 HOT1
Figure 4.2.2
TP1
Figure 4.2.3
- 44 - Copyright © 01 LG Electronics. Inc. All right reserved.
Copyright © 2012 LG Electronics. Inc. All right reserved.
41
O nly for training and service purposes
4. TROUBLE SHOOTING
4. TROUBLE SHOOTING
No
Replace X100
Yes
No
Replace X100
4
TP1
1
26MHz
Only for training and service purposes