- 41 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
Fig4-15. Tranceiver placement
Fig4-16-2. Tranceiver schematic
Tranceiver is ok
Check Control Signal
From TP3, TP4
Tranceiver
Check TP1 & TP2
are 2.8V
Check U400
Replace U401
YES
YES
NO
NO
CHECKING FLOW
Fig2-13-1. Tranceiver schematic
TP3
TP4
U401
U400
Fig4-16-1. Tranceiver schematic
TP2
TP1
4.2.1.4 Transceiver Circuit
)CN(
u
1.0
704
C
ER
O
C
F
R
V
_
8
V2
6
0
4
C
p
2
2
p
9.3
3
0
4
C
2
0
4C
F
n
3
3
N
Y
S
FRV_8
V
2
p
9
3
0
1
4
C
u1
0.
0
104
C
XOP
A9
A6
VCCLNA
A2
B3
VCCMIX
A3
VCCRFLO
A7
VCCRFSYN
VCCRFVCO
A5
VCCVCXOR
A8
VCXTCXO
B8
B6
VDDBB
B5
QOUTB_QINB
QOUT_QIN
C4
VCCAD
D3
GNDMIX
GNDRFLO
C3
C7
GNDRFSYN
GNDRFVCO
C5
IOUTB_IINB
A4
IOUT_IIN
B4
B2
PCSGND
C6
GNDBBAD
CAFC
B7
u
1
0
.0
004
C
5
0
4
C
p9
.
3
TP2
TP1
p
0001314C
414Cu
10.0
914C
I
NDu
1.0
714C
814C
u10.0
Hn2.8
904
L
O
IV
_
8V1
NOX
1CIGOLCC
V
9E
9
D
2
CIGOL
C
CV
OXCVCCV
9C
9B
9
F
A
TA
DXTX
R
7G
N
E
X
TXR
8E
EBO
R
TS
KLCSYS
8F
6G
1TSET
7E
C
I
GO
LD
NG
OXCVDNG
8C
ATADLR
T
C
NE
LRTC
9G
8
D
1K
L
CXU
A
7
D
2K
LC
XU
A
7F
1CIGO
LC
9H
KL
C
LRTC
8G
02
4
C
IND
K
L
C_TB
NI
_
R
E
C
IL
S
K
LC_SYS
S
C_L
RT
C
_FR
KL
C_L
RT
C
_FR
AT
AD_
FR
N
E
_FR
NE_KLC_SY
S
AT
A
D_LRTC
_
FR
TP3
TP4
To Next Page
Loading...
