Daewoo 432X, Service Manual

Page: 25 / 46

23
9. Abnormal Picture
9-1. Horizontal Size
Trouble in L503,
C539 or their ambient
circuit
Trouble in Horizontal
output circuit
Check the B+ and
anode voltage of CRT.
Trouble in H.OSC/
Deflection Circuit
Refer to Horizontal Output circuit
Is
the DC level
of the base of Q521
changeable?
No
Yes
Is
the DC level
of C221
changeable ?
Yes
No
Check the Q519,
Q520 and its
ambient circuit
Is the
collector pulse
of Q506 correct?
Is the
cathode waveform
of D508
correct?
Check the IC201 and
its ambient circuit
Abnormal
H.Size
=1100Vp-p
50-250Vpp
* Normally anode voltage
of CRT is approximately,
24KV
* Scan B+ are as follow :
No
Yes
Yes
No
*
At first, adjust controls in the OSD Menu
MODE B+ Voltage
VGA 72Vdc
Super VGA 86Vdc
54KHz 124Vdc