Functions And Service Data Of Tda7057Aq (N600)’ S Pins; Function And Service Data Of Tda7449 (N650)’ S Pins - Changhong Electric 21NF55 Service Manual

Table 14 Functions and Service Data of TDA7057AQ (N600)' s Pins
Pin
Function Description
No.
1
Volume control input
2
Not connected
3
Audio R signal input
4
Supply voltage
5
Audio L signal input
6
Ground
7
Volume control input
8
Left channel in-phase signal output
9
Ground
10
Left channel inverting signal output
11
Right channel inverting signal output
12
Ground
13
Right channel in-phase signal output
Table 1 5 Function and Service Data of TDA7449 (N650)' s Pins
Pin
Symbol
No.
1 CREF
2 VS
3 PGND
4 ROUT
5 LOUT
6 R_IN1
7 R_IN2
8 L_IN1
9 L_IN2
10 MUXOUT(L)
11 MUXOUT(R)
12 BIN(R)
13 BOUT(R)
14 BOUT(L)
15 TREBLE(L)
16 BIN(L)
17 TREBLE(R)
18 DIG_GND
19 SCL
20 SDA
Notes:
③ The data are only for reference.
④ The data sheet may differ dependent on different models.
SERVICE MANUAL
Reference Voltage (V)
17.48
Digital Multimeter: Victor DT890D
Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ)
4.0
8.0
0
3.3
3.3
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
0
3.4
3.1
Digital Multimeter
Positive Resistance (20KΩ)
0.95 6.85
∞
0.00
2.38 12.59
0.47
2.37 12.5
0.00 0.00
0.95 6.85
8016 6.46
0.00 0.00
8.25 6.46
8.24 6.46
0.00 0.00
8.13 6.46
28.2
1.8
0
9.4
9.4
21.9
26.7
26.7
21.9
24.5
24.5
28.0
28.0
28.0
28.0
30.5
30.5
0
6.8
6.8
40
Negative Resistance (20KΩ)
6.15
∞
6.51
0.47
6.51
0.00
0.15
5.59
0.00
5.59
5.59
0.00
5.59
21.9
1.8
0
9.3
9.3
26.0
24.3.
24.3
26.1
22.5
22.5
26.1
21.0
20.8
26.1
28.0
28.0
0
6.7
6.7