Check Rf Rx Level - LG U8210 Service Manual

4. TROUBLE SHOOTING

4.5.5 Check RF Rx Level

TP1
ANT200
RF200
R221
G2
ANT RF
G1
2.2nH
KMS-507
1p
L229
C283
10nH
ANT_SEL2
ANT_SEL1
Q507
VREG_RFTX_2.85V
ANT_SEL0
UMC4N
TP1
TP2
Test Point (RF Rx Level)
C279 33p
U207
VREG_RFRX_0_2.85V
10
C286 VDD
0.1u
9
VC1
8
VC2
5
VCG
R224
GSM18001900_TX
0 C285
100p
R223
0 C277
100p
R222
0 C281 C284
100p 27p
DMF1950IHC U202
TP2
RX TX
GND
Bias1
L200
C202 12p L201 2.2nH
C200 C645
1p 0.5p
TP3
TP3
Bias1
B as2
TP4
1
GSM900_RX
2
GSM1800_RX
3
GSM1900_RX
4
WCDMA
12
13
GSM900_TX
SFAY0004601
C205 100p
R201 R203
(1%)
5.62K
22
U201
RFL6200
L206
10nH
1 12
L205 4.7nH
GND1 GND4
2 11
8.2nH
DNC UMTS_OUT
3 10
UMTS_BIAS SBDT SBDT
4 9
UMTS_IN VDDM
C203 C209 100
100p 0.1u
R200
- 90 -
i
TP4
VREG_RFRX_0_2.85V
L208
47nH
C217 C218
100p 0.1u C219
4.7u
C211 1p
L202
3.9nH
FL200
2 3
C210 12p C213 0.1u
G1 O1 L203
1
IN
10nH
G2 O2
B7728
5 4
L204
3.9nH
C215 1p
VREG_MSMP_TCXO
C207
L207
4.7u
47nH
Bias2