LG -S310 Service Manual page 123

4. TROUBLE SHOOTING
4.15.4 Check RF Power Blcok
Check the RF Power Regulation and Supply voltage
-VBAT
-VPM_RF_2V8
-AVDD_2V8
AVDD_2V8
TP3
TP
R100
22K
RF_TEMP
R101
10K
C103
82p
C108
C111
C115
0.1u
VBAT
TP1
TP1
C 126
39p
LGE Internal Use Only
C100
39p
1
U100
I
2
IB
3
VSUP_BBI
4
REF_SEL
5 AD6546
SEL_26M
6
VLDO3_DRV
56p 7
TXOP_LO
8
22p
TXOP_HI
9
VLDO3_VCO
10
VBAT1
C116
0.1u
C127
0.1u
Figure 4.15.4 RF Power Block Circuit
VPM_RF_2V8
TP2
C102 100p
TP2
C104
30
82p
Q
29
QB
28
SCLK
27
SDATA
26
SEN
25
VDD
24
REF_OP
23
REFIN
22
REFINB
21
VSUP_REF
C122
C123
220n 0.1u
C128
220n
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AVDD_2V8
C101
0.1u
R103 2.2K
RF_QP
R105 2.2K
RF_QN
RF_S_CLK
RF_S_DATA
RF_S_EN
X100 DSX321G-26M
4 3
1 2
26MHz
Only for training and service purposes