LG KP105 - Page 51

- 52 -
4. TROUBLE SHOOTING
TX Trouble
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U401
SW401
U103
X101
FL401
TP3
TP1TP2
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 GSM900 TX DCS1800 TX GSM900 RX DCS1800 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