Daewoo 432X, Service Manual

Page: 17 / 46

15
2. No Raster
Trouble in
power supply
circuit
Trouble in video
circuit
Trouble in G1
line of Main PWB
Trouble in FBT
High Voltage
trouble in FBT
Trouble in 65Vdc
line of power
supply unit
Refer to trouble
in P.S.U
Refer to trouble in
power supply unit.
Is CRT
heater red-hot?
No
Yes
No
No
No
No
Yes
No
Yes
Yes
Yes
Yes
No
Is Heater
Voltage (CRT PWB)
about 6V?
Increase the Brightness
& Contrast control level
fully Maximum
No Raster
Is whole
screen bright?
Check
G1 voltage about
-60V?
Is 65Vdc
line normal?
Does
increasing of the
Brightness control level
make screen
bright?
Is CRT
G2 (screen) voltage
about 650V?
Trouble in
CRT
Raster OK
Yes