Haier HTAF21C, Service Manual

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12
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CIRCUIT EXPLANATION
1. N201 UOC TDA8377
SYMBOL PIN DESCRIPTION
STAND BY output. 1 In STAND BY mode, low level (Power OFF).
For Power ON this pin will be high.
SCL 2 I
2
C-bus clock line
SDA 3 I
2
C-bus data line
TUNING 4 tuning Voltage (Vt) PWM output
KEY 5 Control keys input
SYSTEM 6 TV system control
VOL 7 Sound Volume control PWM output
MUTE 8 Sound mute output
VSSC/P 9 Digit ground for μ -controller core and periphery
CTL 10 DVD power control
STANDBY 11 STANDBY control
VSSA 12 Analog ground of digital ground of TV-processor
SECPLL 13 Internally connected
VP2 14 2
nd
supply voltage TV-pro8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 Phase-2 filter
PH1LF 17 Phase-1 filter
GND3 18 Ground 3 for TV-processor
DECBG 19 Band gap decoupling
AVL/EWD 20 Automatic volume levelling
VDRB 21 Vertical drive B output
VDRA 22 Vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 Reference current input
VSC 26 Vertical sawtooth capacitor
TUNER AGC 27 Tuner AGC output
AUDEEM/SIFIN1 *1 28 Audio deemphasize or SIF input
DECSDEM/SIFIN2 29 Decoupling sound demodulator
GND2 30 Ground 2 for TV processor
SNDPLL/SIFAGC *1 31 Narrow band PLL filter
AVL 32 Automatic Volume Levelling
HOUT 33 Horizontal output
FBISO 34 Flyback input/sandcastle output
AUDEXT 35 External audio output
EHTO 36 EHT/over voltage protection input
PLL IF 37 IF-PLL loop filter
IFVO/SVO 38 IF video output / selected CVBS output
VP1 39 supply voltage TV processor
CVBS INT 40 internal CVBS input