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CHECKING FLOW
Check TP2& TP3
TP2(High Band),
TP3(Low Band)
Signal is OK ?
Control Signal is
(VLogic,TX EN,
BS1, BS2)OK ?
Check TP4 of U400 ?
TP1 Signal is OK?
TP5 signal same
as TP1?
Mobile SW & FEM is OK.
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No
Yes
No
Ye
s
Yes
No
Yes
No
Yes
- 73 -
Replace PMB8810 (U101)
Check PMB8810
ReplaceFEM (U400)
Replace SW400
EGSM Tx
M o d e
V L O G I C
T x _ E N
S t a n d b y
0
R x 1
1
( G S M 8 5 0 )
R x 2
1
( E G S M )
R x 3
1
( D C S )
R x 4
1
( P C S )
L B _ T x
1
H B _ T x
1
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
B S 1
B S 2
X
X
X
0
0
0
0
0
1
0
1
1
0
1
0
1
0
X
1
1
X
LGE Internal Use Only
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