LG KP270 Service Manual page 110

G1
ANT RF
G2
SW501 KMS-512_P
C552
GSM_PAOUT_LB
C554
DNI
L507 2.2nH
GSM_PAOUT_HB
C556
TP3
DNI
Test Point Net name
TP5 PA_LEVEL
TP4 TXON_PA
TP6 VBAT
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
PGND
TP2
15
GND3
8
GND2
6.8p 11
GND1
14
BY_CAP2
L506
9
18nH
BY_CAP1
13
GSM850_900_OUT
10
DCS_PCS_OUT
12
C559
C558
C557
0.01u
1.5p 0.01u
Description
Power Amp Gain Control. Typically, 0.2 ~1.6V
Power Amp Enable (ON : >1.25V, OFF : <0.5V)
PAM Supply Voltage (Vcc > 3V)
- 111 -
4. TROUBLE SHOOTING
VBAT
TP4
C544
33u
GSM850_900_IN
7
TX_EN
6
R520
VRAMP
U503
5
TP5
VBATT
TQM7M5005
4
BS
3
MODE_SELECT
2
DCS_PCS_IN
1
47p
C560
TP6
C550 C551
27p 6p
TXON_PA
10K
PA_LEVEL
2G_BS
PA_MODE
LGE Internal Use Only