LG KE590 Service Manual page 46

4.1.2.4 RF Transceiver (B6PLD)
Digital Interface to Baseband. Integrate LNA and VCO circuit.
A1
B1
C2
C1
D1
D2
E1
F1
E2
G1
H1
F2
G2
H2
E3
J2
J1
120 120
R407 R408
R410 R411
8dB ATT 8dB ATT
C421
51 51
22p
120 120
R412 R413
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U402
U401
C_VCCRF VCC_SYN
C403
0.01u
C404
0.01u
C407
3.9p
C405
3.9p
C410
C408
22p
0.1u
PCSLNAI
PCSLNAIB
PCSDCSGND
DCSLNAI
DCSLNAIB
DCSG90GND
U403
G90LNAI
G90LNAIB
R2A60167BG
G90G85GND
G85LNAI
EUSY0316801
G85LNAIB
G85GND
GNDLNA_TX1
TXON
GNDDMIXIN
DMIXIN
DMIXINB
(NC) (NC) (NC)
C422
0.01u
<Fig.4> RF Transceiver Circuit Diagram
4. TROUBLE SHOOTING
FL401
U403
X401
C406
33nF
C409
68p
B9
XON
C8
GNDVCXO_OR
D7
VOUTEF2
C412 0.1u
C9
VCCVCXO
D8
Slicer_IN
VOUTEF1
D9
VCCLOGIC2
E7
C413 0.01u C414
GNDLOGIC
F7
CLOGIC1
E9
VCCLOGIC1
E8
STROBE
F8
SYSCLK
F9
RXTXDATA
G7
RXTXEN
G6
TEST1
G9
CTRLEN
G8
CTRLDATA
H9
CTRLCLK
R409
C419 0.01u
C_VCCRF
- 47 -
SN74AHC1GU04DCKR
C402
U401
5
1000p
R401
2 VCC 4
IN OUT
GND
200
3
R402
1M
VRIO
0.01u
C411
U402
1 VCC
R404
_OE
5
2
A
3 4
8.2nH
SYSCLK
Y
GND
SN74LVC1G125DRLR
VCC_SYN
0.01u
VRIO
DIGITALRF_DATA (DBB)
DIGITALRF_ENABLE (DBB)
DIGITALRF_RF_CS (DBB)
DIGITALRF_RF_DATA (DBB)
DIGITALRF_RF_CLK (DBB)
0
SYSCLKEN (ABB)
LGE Internal Use Only
BT_CLK