— 27 —
Symbol PIN Function description Symbol PIN Function description
SYNC 22 Synchronous signal
output
VCO COIL 49 Video detection
V OUT 23 Vertical signal output VCO FIL 50 Video detection filtering
RAMP FIL 24 Forming and filtering for
sawtooth wave
EXT AUDIO IN 51 External sound frequency
input
VCC
•
H/D
•
25 Power supply (horizontal
oscillator/bus)
SIF OUT 52 Sound IF output
H APC FIL 26 Horizontal AFC filtering SIF APC FIL 53 Sound frequency
discrimination APC
H OUT 27 horizontal oscillating
output
SIF IN 54 Sound IF input
7.3 N304 TDA7056B
Function: Sound frequency power amplifying
Symbol PIN Function description Symbol PIN Function description
NC 1 OUT+ 6 Audio output at (+) termina
VP 2 Power supply GND2 7 GND2
VI 3 Audio input OUT- 8 Audio output at (-) terminal
GND1 4 GND1 NC 9
VC 5 Volume control
7.4 N401 LA7840 Function: Vertical scan output
Symbol PIN Function description Symbol PIN Function description
GND 1 INV IN 5 Signal input
V OUT 2 Vertical deflection output VCC2 6 Power supply input
VCC2 3 Power supply of output
stage
PUMP UP 7 Pump power supply
NON INV IN 4 Input
7.5 N601 MC44608P75 Function: Controlled oscillator of switching type power supply
Symbol PIN Function description Symbol PIN Function description
Demag 1 Switching transformer
demagnetic switching
transistor start protection
Driver 5 Output
I
SENSE
2 V613 Sampling current
for over-current protection
VCC 6 Power supply 6~13 V
Control input 3 Error voltage sampling
input
NC 7
Gnd 4 Vi 8 Power supply for turn-on
TV
7.5.1 N601 MC44608P75
·MC44608 is used as a controlled oscillator in switching power supply, the oscillating output at
its pin 5 is used as the input signal of the V613 power switching transistor. Thus, the output voltage of
stabilized voltage power source can be controlled through controlling conduction period and duty
cycle.
·The features of MC44608:
1. Few external elements/ more protections/ save energy – standby power consumption ≤ 3w.
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