DAEWOO ELECTRONICS DTQ-20J5FC, Service Manual

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11
TROUBLESHOOTING GUIDE
2. NO PICTURE
Check the waveform of I101 #46
NG : GO to the figure c
OK : Go the figure d
U102
TUNER
I701
MICOM
XC701
32.768KHz
#10 #11 #12
ST-BY
5V
#29 #30
Check
the crystal
T-DATA T-CLOCK
5V 33V
IF OUT
Check
the voltages
#14
AFT
#27
#28
SDA
SCL
I101
SF101
SAW FILTER
#5 #6
#10
#8
#11
#12
Check
IF Vcc (5V)
Check
clock/data signal
Check
clock/data signal
#3
#4
Check
IF AGC voltage
Check
RF AGC voltage
#46
#44
Z501
4.5M Trap
Check
the waveform
c
I101
#44 Z501
C525
Check
composite video
#18
Check
RBG Vcc (9V)
#19
#20
#21
Check
RBG signal output
T402
FBT
#13
Check
ABL current
#25
Check
HOR/BUS Vcc(5V)
#43
Check
CHROMA/VER Vcc(5V)
D405
Check
200V LINE
R412
Check
heater voltage
d
21V
-3V