Circuit Explanation - Haier HTX21S31 Service Manual

12. Circuit Explanation

IC reference data:
1). N701 (LC86F3232A)
Pin
function
No.
1 n.c
Connect to 5V via a
2
resistor
Connect to 5V via a
3
resistor
Connect to 5V via a
4
resistor
5 Connect to 5V via a
Connect to 5V via a
6
resistor
7 standby
8 n.c.
9 Ground
10 Scl
11 sdl
12 Power supply
13 Key input
14 AFT in
15 AGC in
16 n.c.
17 Reset
18 Filter
19 CVBS in
20 V syn input
21 H syn input
Pin
voltage V
No.
22
5.03 23
5.03 24
5.04 25
5.03 26
5.03 27
0.03 28
0 29
0 30
1.47 31
2.2 32
4.99 33
0.24 34
2.77 35
1.7 36
1.7 37
4.99 38
3.13 39
3.25 40
4.8 41
4.12 42
22
Circuit Explanation
function
R-input
G-input
B-input
Blank
n.c.
I2C bus control 0
I2C bus control 0
I2C bus control 1
I2C bus control 1
Connect to 5V via a
resistor
Connect to 5V via a
onnect to 5V via a resisto
Connect to 5V via a
resistor
Ò £ ¿ Ø ½ Ó Ê Õ
Connect to 5V via a
resistor
Connect to 5V via a
resistor
mute
AV select
Connect to 5V via a
resistor
Connect to 5V via a resist
C resistor
Connect to 5V via a
resistor
voltage V
0.06
0.06
0.07
0.15
0.01
4.85
4.79
5
4.99
5.03
5.04
5.03
0.03
5.02
5.01
0.11
0.02
5.02
5.01
5.01
5.02