Daewoo 432X Service Manual page 20

5. Horizontal Output Circuit
MODE B+ Voltage
VGA 72Vdc
Super VGA 86Vdc
54KHz 124Vdc
14.5Vp-p
11V p-p
12V p-p
Trouble in Horizontal
output circuit
(No Raster)
Is
B+ line boltage
normal?
Yes
Is
Q506 base
waveform
normal?
No
IS
Q505 Gate
waveform
normal?
No
Is
IC501 7pin
H.DRV waveform
normal?
No
Is
IC501 pin 9
voltage about
12V?
Yes
Is
the input H.sync
correct?
No
Trouble in H.sync line
18
No
Trouble in power
supply circuit
Yes
Trouble in FBT
Yes
Trouble in Q505, T501
If the holddown circuit stops the
horizontal oscillator during the check,
turn off the power then turn on again
about 10 seconds later
Yes
Q505 and its
ambient cirucit
No
Check the circuit of
P. S. U
Yes
Trouble in IC501
Refer to trouble
in power supply
unit