No Sound - Daewoo DTQ-20U4SC Service Manual

TROUBLESHOOTING GUIDE

3. NO SOUND

Check MSP output data signal of I601 #28, #29
(e)
33V
TUNER
T-DATA
#27
#10 #11
X701
32.768KHz
Check the crystal
(f)
Check Vcc of sound AMP
Sound B+ 14V
Audio input L
Audio input R
MUTE
Check audio input signal
5V
U101
SIF
SIF OUT
T- CLOCK
#28
I701
MICOM
#29
SDA
#30
SCL
#12
ST-BY
Check clock/data signal
5V
#3#16
I602
#6
TDA8944J
#12
#10
NG : Go to the figure (e)
OK : Go to the figure (f)
#58 #63
#62
I601
MSP
#57
#10 #39
#9 #18
Check audio output signal
#1
#14
#4
#17
-59-
Check
X601
the crystal
18.432MHz
Check Vsup +5V
Check Vsup +8V
Check Vsup +5V
Speaker L
Speaker R
H-phone L
H-phone R
Appendix