Daewoo 531X-3 Service Manual page 11

4. Abnormal OSD Font
Abnormal OSD Font * If menu key selected.
Is menu
No
key selected?
Is OSD Font
exist?
Yes
One color is
missing
Yes
Is the H/V
Check the
No
Blanking
blanking
signal normal?
pulse circuit
Yes
Troubie in
IC801 or its
ambient circuit
18
5. Horizontal Output Circuit
MODE B+ Voltage
31KHz 60Vdc
Trouble in Horizontal
output circuit
37KHz 70Vdc
(No Raster
43KHz 80Vdc
54KHz 105Vdc
60KHz 120Vdc
Is the
68KHz 145Vdc
B+line voltage
over 50V?
3V Is the H-out
waveform of IC501
0V
normal?
50V
Is the Collector
wave form of
0V
Q504 normal?
140V Is the Drain
waveform of
Q507 normal?
0V
Trouble in Q505 and
its ambient circuit.
No
Trouble in 50V
Yes
No
Trouble in IC501
Yes
No
Trouble in Q505
Yes
No
Trouble in Q503, Q506
Yes
19