High Voltage Circuit - Daewoo 710B Service Manual

10. High Voltage Circuit

Trouble in H.V circuit
(No Raster)
Is
B+(45V) line
voltage normal?
Yes
Is Q574
base waveform
normal?
No
Is Q571
collector waveform
normal?
No
Is Q501
emitter waveform
normal?
No
Is IC501
pin 26 waveform
normal?
No
Is IC501
pin 29 voltage
about 12V?
Yes
Is the
input H.Sync
correct?
No
Trouble in H.Sync
No
Trouble in power
supply circuit
Yes
Trouble in Q574 or FBT
Yes
Trouble in Q572, Q573
12V Line
Yes
Trouble in Q571
Yes
Trouble in Q501, Q502
No
Trouble in power supply
Yes
Trouble in IC501
ambient circuit.
27