LG -S310 Service Manual page 135

4. TROUBLE SHOOTING
4.15.10 Check PAM(U101) control signals
Check PAM(U101) control Logic
-RF_PA_BAND(BS) : Low/High Band selection
-RF_PA_EN(TX_EN) : PA enable
-VAPC : PA output Power control signal
U101
16
DCS_PCS_OUT DCS_PCS_IN
15
GND6
14
GND5
13
VCC_OUT
12
GND4
11
GND3
10
GND2
SKY77336
9
GSM_OUT
28
PGND12
27
PGND11
26
PGND10
25
PGND9
24
PGND8
23
PGND7
PAM(U101) control Logic
LGE Internal Use Only
TP1
1
TP1
2
RF_PA_BAND
BS
TP2
3
TP2
RF_PA_EN
TX_EN
4
VBATT
5
VAPC
TP3
6
TP
NC
7
GND1
R109
8
GSM_IN
20
R110
17
270
PGND1
18
PGND2
19
PGND3
20
PGND4
21
PGND5
22
PGND6
R106
12
R107 R108
470 470
RF_TX_RAMP
R111
R112 10K
270
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Copyright © 2010 LG Electronics. Inc. All right reserved.
5
SEL_26M
6
VLDO3_DRV
7
C108 56p
TXOP_LO
C111 22p 8
TXOP_HI
9
VLDO3_VCO
10
VBAT1
C115 C116
0.1u 0.1u
R114 C121
VBAT
220p
24K
C126
C127
0.1u
39p
Only for training and service purposes