LG U8290 Service Manual page 195

8. CIRCUIT DIAGRAM
ANT200
RF200
R221 C279 33p
G2
ANT RF
2.2nH G1
KMS-507
1p
L229
C283
10nH
VREG_RFRX_0_2.85V
10
C286 VDD
0.1u
9
VC1
8
VC2
5
VCG
R224
ANT_SEL2
0 C285
100p
R223
ANT_SEL1
0 C277
100p
Q507
R222
VREG_RFTX_2.85V
0 C281 C284
100p 27p
ANT_SEL0
UMC4N
NA
47p
C638
C292
GSM/DCS/PCS
WCDMA
DMF1950IHC U202
RX TX
27p C642
GND
L504
NA
R212 270
TX_AGC_ADJ
C251
0.01u
C231 100p
R209
PA_ON
10K
C205 100p
R201
(1%)
5.62K
1
GND1
2
L200 8.2nH
DNC
C202 12p L201 2.2nH 3
UMTS_BIAS
4
UMTS_IN
C200 C645 C203
1p 0.5p 100p
ANT_SEL2 ANT_SEL1 ANT_SEL0 GSM_PA_BAND MODE
GSM 900 TX LOW LOW HIGH LOW GSM
DCS/PCS
GSM 900 RX/WCDMA LOW LOW LOW HIGH
DCS1800/PCS1900 TX HIGH HIGH LOW
DCS 1800 RX LOW HIGH LOW
PCS 1900 RX HIGH LOW LOW
U207
1
GSM900_RX
2
GSM1800_RX
3
GSM1900_RX
4
WCDMA
12
GSM18001900_TX
13
GSM900_TX
SFAY0004601
C289
NFM21PC105B1A3
2 1
+VPWR
OUT IN
4 3
C295 C296 G2 G1
100u
0.01u
NA
22p
C280
C293
C305 C297
C299 0.01u 100u
68p
R234
15 3
DCS_PCS_OUT DCS_PCS_IN
24 R228
11 4
U209
GSM_OUT GSM_IN
15
18 100
R225
SKY77328 ENABLE GSM_PA_EN
19 1 R236
RSVD_GND BS GSM_PA_BAND
R227 100 R233 R229
150
200 270
C298 C304
15p 15p
SMPY0008201
U204
RF_OUT RF_IN
11 3
L503 Q200
NA
+VPWR
C259
10u
C282
4.7u
SI3493DV
0
PA_FET_N
R214
+VPWR
C245 VREG_PA
0.01u
C250 Q505
UMC4N
0.01u
PA_ON
HDET
VREG_RFTX_2.85V
U203 LMV225TLX
A1 A2
RFIN_EN VDD VREG_RFTX_2.85V
B1 B2
HDET1
GND OUT
C236 C234
1500p 27p
VREG_RFRX_0_2.85V
L208
47nH
C208
C217 C218 100p
100p 0.1u C219
4.7u
R203
22
U201
C211 1p
RFL6200
L206
10nH L202
3.9nH
FL200
12
L205 4.7nH 2 3
GND4 C210 12p C213 0.1u
11 G1 O1 L203
1
UMTS_OUT IN
10nH
10 G2 O2
SBDT SBDT
B7728
9 5 4
VDDM
L204
3.9nH
C209 100 C215 1p
0.1u
VREG_MSMP_TCXO
R200
C207
L207
4.7u
47nH
TX_VCO_EN_0_N TX_VCO_EN_1_N
GSM900 HIGH LOW
DCS1800/PCS1900 LOW HIGH
OFF HIGH HIGH
L220 7.5nH
FL203
C226 8p
2 3
G1 O1
1
IN
G2 O2
5 4
L210 B7846
1930-1990 MHz
8.2nH
L221 7.5nH
VREG_RFTX_2.85V
L214 7.5nH
B7844
L218
FL202
R231
2 3 33nH
C224 6p G1 O1
1 3.3K
IN
G2 O2
5 4
C233 C306 C301
L209
1000p 10n 820p
1805-1880 MHz
L219
8.2nH ECHU1C103JX5
33nH (PPS)
L215 7.5nH
C308
RX_VCO_IN
27p
L212 15nH
FL201
B7837
L216
2 3 22nH
C227 9p
1 G1 O1
IN
G2 O2
R239
5 4
C232
L211
925-960 MHz 1000p 82
L217
22nH C316 C310 C313
22nH (PPS)
120p 1000p 22n
L213 15nH
ECHU1C223JX5
R238
MQW5V0C869M U210
FB201
47
10 3
VC VB VREG_RFTX_2.85V
R240 100
1 9
GSM_TX_VCO_0_EN_N
OUT_GSM SW1
5 11 R237 100
GSM_TX_VCO_1_EN_N
OUT_DCSPCS SW2
R235 8 2
GND5 GND1 VREG_MSMP_TCXO
12 4
GND6 GND2
220
13 6
GND7 GND3
14 7
GND8 GND4 VREG_RFTX_2.85V
C240 C238
R232
C257
4.7u 0.1u 100p
51
FL204
EFCH1950TDC1 3
C255 6p
G3
4 1
OUT IN
G2 G1
5 2
MQL302A1G71 U208
1 7
VREG_SYNTH_2.85V
OUT VCC
FB200
3 5
UHF_VCO_EN SWITCH CON C290 C294 C288
4.7u
33p 0.01u
8 2
GND4 GND1
6 4
GND3 GND2
RX_QP
11K
RX_QM
(1%)
R220
RX_IP
RX_IM
1 30
GND1 RX_IM
2 29
DNC1 VDDA7
3 28
GND2 TCXO
4 27
VDDA1 U200 VDDA6 VREG_RFRX_0_2.85V
5 26
GND3 RFR6200 SBDT SBDT
6 25
UMTS_INP SBCK SBCK C201 C204
7 24
GND4 SBST SBST 100p 0.1u
8 23
UMTS_INM VDDM
9 22
GND8
GND5
10 21
DNC2 DNC4
R202
VREG_MSMP_TCXO
51
C212 C216
100p 0.1u
R205
5.1
C221 C223 C222
100p C220 100p 0.1u
12p
RX_VCO_IN
- 196 -
DAC_REF
TX_IM
L222
C256
12nH
47p
TX_IP
C241
1000p TX_QM
L223
C262
12nH
47p
TX_QP
C253 R215
33p VREG_RFTX_2.85V
10
C264
0.1u
R230
1.8K
VREG_SYNTH_2.85V
C237 R217 C263 C269 C270
4.7u
100p 0.1u
C302 33p 10
0.01u
C268 33p
C300
100p
CP_HOLD2 RX_IN RX_IM
29 14
RX_IP
CP2 RX_IP
30 13
RX_QM
VDDA9 RX_QN
31 12
RX_QP
RX_VCO_IN RX_QP
R210 32 11
R_BIAS VDDA4
11K (1%) 33 10
GSM1800_INN VCO_TUNE
34 9
GSM1800_INP RTR6250 VTUNE_REF
35 8
VDDA10 U205 VDDA3 VREG_RFTX_2.85V
36 7
GSM900_INP TCXO
37 6
VDDA2 R218 C266
GSM900_INN
38 5
VDDA11 VDDA1 6.2K 0.1u
R216 3.3K
39 4
TX_MOD_CP FAQ1
40 3
VDDA12 CP1
41 2
TX_VCO_FB CP_HOLD1 C273 C267
42 1
3.9n 390p
C307 C261 (PPS)
82p 0.01u
VREG_RFTX_2.85V
R211
C248 C258 C260 C271 C272
4.7u
51 C244 C246 33p 33p 100p 0.1u
0.01u 1000p
R213
RF_ON_TX_ON TX_AGC_ADJ
C247 C252 1K
100p 4700p
C265
1000p VREG_TCXO_2.85V
C276 C274
1000p 0.1u
19.2MHz
VCC GND
4 2
R219
OUT VCONT TRK_LO_ADJ
3 1
100
TG-5001LA-19.2MHz
C275
U206
0.01u
C287 100p
TCXO_PM
C206
1000p
TCXO_BT_IN
R206
VREG_RFTX_2.85V PA_THERM
80.6K R207
(1%) RT200
C225
470K 0.068u
(1%)
68K_2012_10%