LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 135 -
Test Point
Net name
Description
TP1
CLK_REQ
On/Off Con trol external clock source
0 : TCXO off
1 : TCXO o n
TP2 XTALP TCXO
outp ut clock : 26MHz
C122
10u
R111
39K
200K
R112
C126
10u
0
R107
R110
100K
VDD1_2
121K
R109
AGND
5
AVIN
3
11
EN1
2
EN2
FB1
12
1
FB2
PGND
6
PGOOD
10
8
SW1
4
SW2
13
T_GND
9
VIN
_FPWM
7
MIC2238_AAYML
U102
C124
22p
L100 2.2uH
2.2uH
L101
GND
2
1
4
VCC
5
TC7SH04FS
U202
TP206
TP205
VDD3_3
1u
C220
22p
C125
C123
+VPWR
10u
R106
0
WLAN_REG_ON
BT_REG_ON
CLK_REQ
Test Point of TCXO
Schematic of power block