Haier 21F8A - Circuit Explanation

25
11.
Circuit Explanation
IC function pins
1) Integrated circuits used in this model
1 TMPA8829B VIF SIF VIDO Signal processing RGB/output circuit,Scan
Circuit,CPU.
2 LA7841 Vertical scan circuit.
3 TDA7057 Sound power amplify circuit.
2) IC functions and parameters
Pins of IC
N402 LA7841
Reference resistor K
No Function
Reference
voltage V
Position Negative
1 Ground 0 0 0
2 Output 13 0.45 1.9
3 Pump 25 0.5
4
Vertical scan saw-tooth wave
signal input
0.95 0.9 1.25
5
Vertical scan saw-tooth wave
signal
0.75 0.68 1.75
6 Vertical power 25 0.5 2.95
7 Vertical power input 0.83 0.65 1.3
N701 TDA7057
Reference resistor K
No Function
Reference
voltage V
Position Negative
1 Power supply 26 0.43 1.8
2 Power amplify output 10.9 0.58 1.6
3 No used 0
4 Ground 0 0 0
5 No used 1.2
Circuit Explanation