Daewoo CMC-518X, Service Manual

Page: 22 / 61

9. Abnormal Picture
9.1 Horizontal Size
* At first, adjust controls in the OSD Menu
20
=1100Vp-p
Yes
Is
changeable the
DC level of the base
of Q508?
Is
changeable the
DC level of pin 7 of
the IC201?
Is the
collector pulse
of Q502 correct?
MODE
VGA
Super VGA
54KHz
Yes
Refer to Horizontal Output circuit
Yes
No Yes
Check the Q515,
Q516 and its
ambient circuit
Check the IC201 and
its ambient circuit
Trouble in H.OSC/
Deflection Circuit
Trouble in Horizontal
output circuit
Check the B+ and
anode voltage of CRT.
* Normally anode voltage
of CRT is approximately,
24KV
* Scan B+ are as follow :
No
No
No
Abnormal
H.Size
Is the
cathode waveform
of D506
correct?
B Voltage
72Vdc
89Vdc
121Vdc
50-250Vpp
Trouble in L501,
C523 or their ambient
circuit
+