LG GSA-4167B Service Manual page 82

PCB Poor Analysis - Check list
No Circuit/IC
1 Power supply
2
3 (IC701)
4
5 (IC703)
6 Flash-ROM
7 (IC302)
8
9 DSP
10 (IC301)
11
12
13
14 AFE
15 (IC101)
16 OP-amp
(IC102)
17 7ch-DRV
18 (IC601)
19
20
21 Pick-up
22
23
24
25
26
27
* When there are twe or more power supply pins of LSI, it checks by one ramdom pin first.
Signal Signal/Level
Line-12V 12V
Line-5V 5V
reg-1.5V 1.5V
reg-2.8V 2.8V
reg-3.3V 3.3V
VDD : 3.3V 3.3V
CS Active-Low
XRD read-CK
VDD : 1.5V 1.5V
VCC(D) : 3.3V 3.3V
VCC(A) : 3.3V 3.3V
Clock-34MHz 33.8688MHz
MRSTB (3.3V)High
VCC : 5.0V 5.0V
VDD : 3.3V 3.3V
VCC : 5.0V 5.0V
5VCC : 5V 5V
VM3 : 5V 5V
VM1, 2 : 12V 12V
REF : 1.65V 1.65V
VCC(FM) : 5.0V 5.0V
VCC(OEIC) : 5.0V 5.0V
VC(OEIC) : 2.1V 2.1V
VREF : 2.5V 2.5V
VSL25 : 2.8V 2.8V
VSA5 : 5.0V 5.0V
VSO : 5.0V 5.0V
mesurement-point (IC-pin or Device)
CN801-41
CN801-44
IC701-2
IC703-5
IC703-2
37
26
28
41, 28, 72, 130, 146, 159, 189, 193, 197
7, 32, 52, 58, 75, 88, 133, 148, 200, 199, 2, 53, 185,
139, 108, 8, 26
186, 166, 99
106, 107
202
8, 78
22, 11, 91, 59, 69, 82
8
32
26
5, 22
42
11
44
43
9
16
15
29
87