Daewoo NC-8913 - Power and Amplifier Section Troubleshooting

TroubleShootingGuide
POWER&AMP Section
1
3
3
4
5
6
7
8
9
1
3
3
4
5
6
7
8
9
AC cord in
no
Tuner/AUX/CD/USB Speaker
sound
no
Phones sound
no
Power ON/OFF ON
Yes
1.Check F980，F981
2.Check PT903
3.Check RF982，RF983
4.Check CN902,CN701
5.Check IC900 of 3pin:9V ,
IC704 of 2pin:3.3V
6.IC701 of 22pin:3.3V
no
LCD Display and back
light
1.Check LC701
2.Check IC701
3.Check LD701 and LD702
1.Check J701
2.Check IC702(IL4560D)
3.Check CN700
Yes
Yes
1.Check IC800(TDA7292):Voltage of 3pin,
6pin and 1pin :more than DC(29.5,-29.5V).
2.Check IC801(TDA7292)/(CD7269ACZ):
Voltage of 3pin, 6pin and 1pin :more than DC
(29.5,-29.5V)/(18,-18V).
3.Check IC400(SC7314S):
Voltage of 1pin: normal DC(8.5V).
4.Check IC401/IC402(NJM4558M)
5.Check TUNER/AUX/CD input signal
6.Check output signal pin of IC800/IC801(
p
in2,pin4).
7.Check CN800.
8.Check output signal terminals(J800).
Yes