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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TX Trouble
U401
SW401
U103
X101
FL401
TP3
TP1
TP2
TEST POINT
7
GSM_RX
NC
18
21
PGND
TX_EN
4
1
VBATT
VLOGIC
2
3
VRAMP
PCS_IN
19
6
PCS_RX
17
11
ANT
5
BS
GND1
8
9
GND2
10
GND3
GND4
12
13
GND5
GND6
14
15
GND7
GND8
16
GND9
20
GSM_IN
1K
R405
39p
C409
39p
C411
SKY77517
U401
C408
39p
C410
39p
VLOGIC
BS
TXON_PA
TX_RAMP
CIRCUIT
Mode
GSM850 TX
PCS1900 TX
GSM850 RX
PCS1900 RX
VLOGIC (TP1)
H(2.7V)
H(2.7V)
H(2.7V)
H(2.7V)
TXON_PA (TP2)
H(2.7V)
H(2.7V)
L
L
BS (TP3)
L
H(2.7V)
L
H(2.7V)
TP2
TP1
TP3
Содержание KP107a
Страница 1: ...Service Manual Model KP107a Service Manual KP107a Date April 2008 Issue 1 0 Internal Use Only ...
Страница 122: ...Note ...
Страница 123: ...Note ...