LG GB220 - Page 72

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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
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
CHECKING FLOW
Check TP2& TP3
Mobile SW & FEM is OK.
Yes
TP5 signal same
as TP1?
Replace SW400
No
Yes
Replace PMB8810 (U101)
TP2(High Band),
TP3(Low Band)
Signal is OK ?
No
Yes
Check PMB8810
Control Signal is
(VLogic,TX EN,
BS1, BS2)OK ?
No
Ye
s
Yes
Check TP4 of U400 ?
TP1 Signal is OK?
ReplaceFEM (U400)
No
EGSM Tx
M o d e V L O G I C T x _ E N B S 1 B S 2
S t a n d b y
0XXX
R x 1
( G S M 8 5 0 )
1000
R x 2
( E G S M )
1001
R x 3
( D C S )
1011
R x 4
( P C S )
1010
L B _ T x
110X
H B _ T x
111X