LG KC550 Service Manual page 124

8. CIRCUIT DIAGRAM
GSM850_EGSM TX
DCS_PCS TX
GSM850 RX
EGSM900 RX
DCS1800 RX
PCS1900 RX
DUMMY FEED
ANT501
R596
G2
ANT RF
G1
2.2nH R504
SW500
100p
L584 KMS-512
10nH L583
NA
BLUETOOTH_CSR
ANT500
GND1
R514
FEED GND2
1
L506
AMAN802015LG14
NA L520
NA
C537 C538
15p 15p
FM_SND_R
FM_SND_L
C540 220n
C541
1000p
CLK32K
C543
1000p
26M_BT
L507 33nH
C544
FM_ANT
820p
C547 C546 15p
15p
FL500
LFB212G45BA1A220
UB B1
3 5
NC_DC G2
2
6
NC B2
1
7
VRF2_1V5_internal
L510 33nH
C548
1.5p
BT_VCXO_EN
BT_RESET
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
R500
VC1
1
C500
33p
VC1 VC2
PIN 14 PIN 13
H L R501
VC2
L H 1
L L585
L
NA
L L
L L
L L
U501
LSHS-C085FB
L570
11
5.6nH
1.2p
L581
C570
NA
L571
2.2nH
C513 C514 C515
C516 C517 C518 C519 C520
2.7p 2.7p 5.6p
5.6p 3.3p 3.3p 15p 15p
L580 C510
1p
NA
L503 L504
L502 L505
15nH 5.1nH
18nH 3.9nH
GSM900
GSM850 DCS1800 PCS1900
VIO_2V62
FB500
VRF2_1V5_internal
C528
0.01u
C531 C532 C533 C534 C535 C536
15p 0.1u 2.2u 22n 27p 15p
47n C539
AU_REF I2C_DATA
A3 C8
SPKR_R I2C_CLK
A4 C7 R517 0
SPKR_L
A5
R590 USB_DN
560 K6
FILT_EXT USB_DP
B3 J7 R518 0
CLK_32K UART_CTS
C542
C9 H6
LO_REF UART_RTS
0.1u
K3 H5
XTAL_OUT UART_RX
J2 K7 R519 0
XTAL_IN UART_TX
K2 J8
U502
L508 470nH
BLUECORE5-FM
FM_P PCM2_CLK
C545 B1 D9 R520 0
FM_N PCM2_SYNC
820p A1 D10
PCM2_IN
E10
AUX_DAC PCM2_OUT
R521
B5 D8
RX_N
D1 TP510
1 RX_P PCM_CLK
E1 H9 TP511
RF_P PCM_SYNC
L509 F1 J10 TP512
RF_N PCM_IN
6.8nH G1 K8 TP513
PCM_OUT
H7
R526
1
VAUX_2V9
TP505
C549
FB501
TP506
0.1u
BT_INT
R527
2.2
TP507
C551
C553 C550 2.2u
2.2u
0.01u
C554
0.1u
VIO_2V62
R502 100K
RF_TEMP
R503 10K
VBAT
R505
PGND GSM850_900_IN
15 7
1
R507
GND3 TX_EN
8 6
GND2 1
R508
11
GND1 VRAMP
14 5
U500 1.2K
TQM7M5005
BY_CAP2 VBATT
9 4
BY_CAP1 BS
13 3
GSM850_900_OUT MODE_SELECT
10 2
DCS_PCS_OUT DCS_PCS_IN
12 1
C521 C522
0.01u 0.01u
C523 C511 C524 C526 C512 C525 C527
L500
33 uF
1000p 27p 100p 100p 100p 820p
NA
UART_BT_RTS
UART_BT_CTS
UART_BT_TX
UART_BT_RX
I2S1_CLK
I2S1_WA0
I2S1_TX
I2S1_RX
- 125 -
TXLB
PA_EN
TX_RAMP
PA_BAND
R509 1
PA_MODE
L572 R510 1
TXHB
4.7nH
L501
2.7nH
LGE Internal Use Only