Haier DTA-1518, Руководство по обслуживанию

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11
8 +5V Power
3. TV sound AM-demodulator and audio source switch (TDA9830)
Symbol PIN Function Symbol PIN Function
IFIN
1
sound IF differential input signal EXTIN
9
input signal (from external) to audio switch
n.c.
2
not connected SWITCH
10
switch input select control
C
AGC
3
AGC capacitor
V
p2
11
supply v12 V (alternative)
C
REF
4
REF voltage filtering capacitor MUTE
12
mute control
n.c.
5
not connected
GND
13
ground (0 V)
AMOUT 6 AM demodulator output V
p1
14
supply v5 to +8 V
AMIN
7
input signal (from AM) to audio switch n.c.
15
not connected
AFOUT 8 output signal from audio switch
IFIN
16
sound IF differential input signal
4. Vertical deflection booster (TDA4863AJ)
Symbol PIN Function Symbol PIN Function
VP1 1
positive supply voltage 1
V-OUT 5
vertical output
VP3 2 flyback generator output INN 6 inverted input of differential input stage
VP2 3
supply voltage 2 for vertical output INP
7
non-inverted input of differential input stage
GND 4
ground or negative supply voltage
5.Tuner
PIN Function PIN Function
1 AGC 7 +5V
2 vacant 8 vacant
3 Gnd 9 Vt 33V
4 SCL 10 Gnd
5 SDA 11 IF Out
6 +5V
6. Test point Waveforms
7. IC voltages
TDA9351
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
5Vpp
0.9Vpp
1.3Vpp
H
H
1Vpp
V
CRT KB
CRT KG CRT KR
95Vpp
95Vpp 95Vpp
H
H H
TDA9351PIN53
2.5Vpp
2.5Vpp 3.8Vpp
H H
H
TDA9351 PIN52 TDA9351 PIN51
TDA9351 PIN33 TDA9351 PIN34
0.8Vpp
V
TDA9351 PIN21 TDA9351 PIN22 TDA9351 PIN59
1.2Vpp
2.6Vpp
H
H
TDA9351 PIN40
TDA9351 PIN38