LG L240 Service Manual page 46

4.2.1.4 RF Main Transceiver Circuit
C739
C740
U702
C73 8
C740
C739
VCC_2.8V
R706
C723
VCC_1.8V
705
NA 33p
0
R708
NA
VCC_2.8V
C727 C728
1u 33p
C735
15p
F3
SYSCLK
J1
BT_CLK
H3
AUX_CLK
C738
L2
4700p TX_CP_X
L3
TX_CP
A1 E4
TX_EN GND25
A2 E5
TX_ANT_EN GND26
D3 E6
RX_ANT_EN GND27
B2 E7
IPC_BCM GND28
E8
U702
GND29
G2 E9
MMM6000
DBG_FRAME GND30
G3 E10
DBG_DATA GND31
K1 E11
DBG_CLK GND32
F4
GND33
A5 F5
ATST1_N GND34
B5 F6
ATST1_P GND35
G10 F7
ATST2_N GND36
H10
ATST2_P
B9
RESET_B
C2
US_EURO
C3
LB_HB
L8
LB_OUT
L10
HB_OUT
B3
PA_OUT
TX_EN
C738 TOP Point
- 47 -
4. TROUBLE SHOOTING
VCC_2.8V VCC_2.8V
C726
1.8p C730 C731 C732
33p 33p 2.2u
C736
2.2u
G1
SYSCLKEN SYSCLKEN
J3
BT_CLK_EN BT_CLK_REQ
A4
PAC_DET VDETECT
D1
DIGITALRF_ENABLE
RXTXEN_TDO
E3
DIGITALRF_DATA
RXTXDATA_TDI
H4
GND49
H5 A6
GND50 REF_HI
H6 B6
GND51 REF_LO
H7
GND52
H8 F1
DIGITALRF_RF_CLK
GND53 CTRLCLK_TCK
H9 D2
DIGITALRF_RF_DATA
GND54 CTRLDATA
H11 E1
DIGITALRF_RF_CS
GND55 CTRLEN
J6
GND56
J10 E2
GND57 STROBE_TMS STROBE
J11
GND58
J12 A12
GND59 SAW_CELLX
K2 B12
GND60 SAW_CELL
D12
SAW_EGSMX
E12
SAW_EGSM
G12
SAW_DCSX
H12
SAW_DCS
K12
SAW_PCSX
L12
SAW_PCS
K4
C741 330p
EXTAL
K5
XTAL
C737
33p
C739 C740
1u 1u