LG L240 Service Manual page 41

4. TROUBLE SHOOTING
4.1.2.5 RF Transceiver (MMM6000)
Digital Interface to Baseband. Integrate LNA and VCO circuit.
R703 R706
R704 R705
NA NA
0
0
R707 R708
NA NA
SYSCLK
BT_CLK
C738
4700p
C739
C740
U702
C738
VCC_2.8V
C723
VCC_1.8V VCC_2.8V
33p
VCC_2.8V
C727 C728
1u 33p
C735
15p
F3
SYSCLK
J1
BT_CLK
H3
AUX_CLK
L2
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
GND29 U702
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
<Fig.5> RF Transceiver Circuit Diagram
- 42 -
VCC_2.8V
C726
1.8p C730 C731 C732
33p 33p 2.2u
C736
2.2u
G1
SYSCLKEN
J3
BT_CLK_EN
A4
PAC_DET
D1
RXTXEN_TDO
E3
RXTXDATA_TDI
H4
GND49
H5 A6
GND50 REF_HI
H6 B6
GND51 REF_LO
H7
GND52
H8 F1
GND53 CTRLCLK_TCK
H9 D2
GND54 CTRLDATA
H11 E1
GND55 CTRLEN
J6
GND56
J10 E2
GND57 STROBE_TMS
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
EXTAL
K5
XTAL
SYSCLKEN
C737
BT_CLK_REQ
33p
VDETECT
DIGITALRF_ENABLE
DIGITALRF_DATA
C739 C740
DIGITALRF_RF_CLK
1u 1u
DIGITALRF_RF_DATA
DIGITALRF_RF_CS
STROBE
330p