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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
)
C
N
(
u
1
.
0
7
0
4
C
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R
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F
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8
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2
6
0
4
C
p
2
2
p
9
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3
3
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0
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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
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1
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9
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K
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C
L
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T
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8
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0
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4
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D
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T
B
N
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Y
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A
T
A
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K
L
C
_
S
Y
S
A
T
A
D
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L
R
T
C
_
F
R
T
P3
T
P4