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Vcc
3
V OUT
4
GND
5
5. U101：Tuner
PIN
Function
1
AGC
2
vacant
3
Gnd
4
SCL
5
SDA
6
+5V
6. Test point Waveforms
2.6Vpp
H
TDA8377 PIN38
95Vpp
H
CRT KR
1Vpp
V
TDA8377 PIN21
TDA8377 PIN22
7. IC voltages
TDA8377
PIN
1
2
3
V
0
3.8
3.6
PIN
17
18
19
V
4
0
4
PIN
33
34
35
V
0.5
0.3
0
PIN
49
50
51
Pump up power
Vertical output
Ground
PIN
Function
7
+5V
8
vacant
9
Vt 33V
10
Gnd
11
IF Out
1.2Vpp
H
TDA8377 PIN40
TDA8377 PIN53
95Vpp
95Vpp
H
CRT KG
CRT KB
1.3Vpp
0.8Vpp
V
TDA8377 PIN59
4
5
6
3.3
3.5
4.4
20
21
22
0.5
0.7
0.8
36
37
38
1.7
2.4
3.4
52
53
54
V PRO
V FEEDBACK
3.8Vpp
2.5Vpp
H
H
TDA8377PIN52
0.9Vpp
H
H
TDA8377 PIN33
7
8
9
10
5.1
1.8
0
0.18 0.17
23
24
25
26
1.9
1.9
3.9
3.8
39
40
41
42
8
3.9
0
3.3
55
56
57
58
10
8
Vertical protection
9
Vertical feedback
2.5Vpp
H
TDA8377 PIN51
5Vpp
H
TDA8377 PIN34
11
12
13
14
0
2.3
8
27
28
29
30
1.6
3.2
2.3
0
43
44
45
46
0
3.6
1.4
2.5
59
60
61
62
15
16
5
3
31
32
2.3
0.2
47
48
2.5
2.5
63
64
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