Checking Ant. Sw Module; Checking Rf Tx Level - LG U8210 Service Manual

4.6.2 Checking Ant. SW Module

4.6.3 Checking RF Tx level

TP1
ANT200
2.2nH
1p
C283
VREG_RFTX_2.85V
ANT_SEL0
Refer to chapter 4.4
TP1
TP2
TP3
Test Point (RF Tx Level)
RF200
R221
C279 33p
G2
ANT RF
G1
KMS-507
L229
10nH
VREG_RFRX_0_2.85V
C286
0.1u
R224
ANT_SEL2
0 C285
100p
R223
ANT_SEL1
0 C277
100p
Q507
R222
0 C281 C284
100p 27p
UMC4N
C638
TP2
Schematic of RF Tx Level
4. TROUBLE SHOOTING
U207
1
GSM900_RX
2
GSM1800_RX
10 3
VDD GSM1900_RX
9 4
VC1 WCDMA
8
VC2
5
VCG
12
GSM18001900_TX
13
GSM900_TX
SFAY0004601
NFM21PC105B1A3
C295 C296
100u
0.01u
NA NA
47p 22p
C280
C292 C293
C305
C299 0.01u
68p
15 3
DCS_PCS_OUT DCS_PCS_IN
11 4
U209
GSM_OUT GSM_IN
18
ENABLE
SKY77328
19 1
RSVD_GND BS
- 95 -
TP3
C289
2 1
OUT IN +VPWR
4 3
G2 G1
C297
100u
100 R225
GSM_PA_EN
GSM_PA_BAND
R227 100
C298 C304
15p 15p