5．Circuit Explanation - Haier HTAF21C Service Manual

5．CIRCUIT EXPLANATION
1. N201 UOC TDA8377
SYMBOL
STAND BY output. 1
SCL 2
SDA 3
TUNING 4
KEY 5
SYSTEM 6
VOL 7
MUTE 8
VSSC/P 9
CTL 10
STANDBY 11
VSSA 12
SECPLL 13
VP2 14
DECDIG 15
PH2LF 16
PH1LF 17
GND3 18
DECBG 19
AVL/EWD 20
VDRB 21
VDRA 22
IFIN1 23
IFIN2 24
IREF 25
VSC 26
TUNER AGC 27
AUDEEM/SIFIN1 *1 28
DECSDEM/SIFIN2 29
GND2 30
SNDPLL/SIFAGC *1 31
AVL 32
HOUT 33
FBISO 34
AUDEXT 35
EHTO 36
PLL IF 37
IFVO/SVO 38
VP1 39
CVBS INT 40
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PIN
In STAND BY mode, low level (Power OFF).
For Power ON this pin will be high.
2
I C-bus clock line
2
I C-bus data line
tuning Voltage (Vt) PWM output
Control keys input
TV system control
Sound Volume control PWM output
Sound mute output
Digit ground for μ-controller core and periphery
DVD power control
STANDBY control
Analog ground of digital ground of TV-processor
Internally connected
nd
2 supply voltage TV-processor(+8V)
decoupling digital supply of TV-processor
Phase-2 filter
Phase-1 filter
Ground 3 for TV-processor
Band gap decoupling
Automatic volume levelling
Vertical drive B output
Vertical drive A output
IF input 1
IF input 2
Reference current input
Vertical sawtooth capacitor
Tuner AGC output
Audio deemphasize or SIF input
Decoupling sound demodulator
Ground 2 for TV processor
Narrow band PLL filter
Automatic Volume Levelling
Horizontal output
Flyback input/sandcastle output
External audio output
EHT/over voltage protection input
IF-PLL loop filter
IF video output / selected CVBS output
supply voltage TV processor
internal CVBS input
DESCRIPTION
12