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4.2.1.4 RF Main Transceiver Circuit
FL401
U403
TP2
U402
TP1
U401
SYSCLK
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
120
120
R407
R408
R410
R411
8dB ATT
8dB ATT
X401
51
51
120
120
R412
R413
<Fig.3> Main Transceiver Circuit Diagram
- 53 -
4. TROUBLE SHOOTING
C_VCCRF
VCC_SYN
C403
0.01u
C404
0.01u
C407
3.9p
C405
3.9p
C406
33nF
C409
C410
C408
22p
0.1u
68p
A1
B9
PCSLNAI
XON
B1
C8
PCSLNAIB
GNDVCXO_OR
C2
D7
PCSDCSGND
VOUTEF2
C412
C1
C9
DCSLNAI
VCCVCXO
D1
D8
DCSLNAIB
VOUTEF1
D2
D9
DCSG90GND
VCCLOGIC2
E1
E7
U403
G90LNAI
GNDLOGIC
F1
F7
G90LNAIB
CLOGIC1
E2
E9
R2A60167BG
G90G85GND
VCCLOGIC1
G1
E8
G85LNAI
STROBE
H1
EUSY0316801
F8
G85LNAIB
SYSCLK
F2
F9
G85GND
RXTXDATA
G2
G7
GNDLNA_TX1
RXTXEN
H2
G6
TXON
TEST1
E3
G9
GNDDMIXIN
CTRLEN
J2
G8
DMIXIN
CTRLDATA
J1
H9
DMIXINB
CTRLCLK
(NC)
(NC)
(NC)
C421
22p
C419 0.01u
C422
0.01u
C423
SYSCLKEN
VRIO
C401
0.01u
SN74AHC1GU04DCKR
C402
U401
5
1000p
R401
2
VCC
4
BT_CLK
IN
OUT
GND
200
3
R402
TP1
1M
VRIO
0.01u
C411
U402
1
VCC
R404
_OE
5
2
A
4
3
8.2nH
SYSCLK
Y
GND
SN74LVC1G125DRLR
0.1u
Slicer_IN
VCC_SYN
C413
0.01u
C414
0.01u
VRIO
DIGITALRF_DATA
(DBB)
DIGITALRF_ENABLE
(DBB)
DIGITALRF_RF_CS
(DBB)
DIGITALRF_RF_DATA
(DBB)
DIGITALRF_RF_CLK
(DBB)
TP2
R409
0
SYSCLKEN
(ABB)
C_VCCRF
LGE Internal Use Only
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Troubleshooting
