Troubleshooting Guide; No Power - Daewoo DTQ-20U4SC Service Manual

TROUBLESHOOTING GUIDE

1.NO POWER

125V 5A
Drain
Source
/OCL
Vin
Vcc
GND
F / B
D802
Z / C
L801
R801
FB01
Check
F801(125V/5A)
TSM-5345B9
#2
R807
+
#3
C804
#4
Check
Waveform
L802
C809
#8
R891
R892
D810
#7
R805
+
C807
C892 R893
C891
D811
D804
Check
R801(10W,1)
C803
C802
C818
D801
T801
+133V
#12
L807
+45V
#13 L806
#14
+13.5V
#9
#10 +12V
R870
#11
R872
I804
LTV817
D871
I804
R802
LTV827
D806
I805
LTV817
-57-
D804 R862
+
+
R822
C819
R813
R814
+ +
L805
C820
C814
C813
D807
C817
D808
+
C815
R817
C832
Q805
D813
+
R818
C812
D812
R878
R879
R869
C871
I803
R868
R874
R873
Q871
R877
R827 Q873
R876
Appendix
OCP
+133V
Check
Voltage
Check
voltage
+45V
+12V
(Sound)
Check
Voltage
+5V
+
(St-By)
C706
(Micom Power on/off)
PWR on : H
PWR off : L