Daewoo 531X-3 Service Manual page 15

10. Side-Pincushion Circuit
Pincusion distortion
is excessive or barrel
Select the
side-pincushion
icon in OSD menu,
and adjust acceptable
position.
No
Is the
pin 24 waveform of
IC501
correct?
No
Trouble in IC501
Yes
O.K
Yes
Check the Base
waveform of the Q515
26
11. Power Supply Unit (P.S.U)
Trouble in P.S.U
Is
power switch
on?
Yes
Is
fuse F001
O.K?
Yes
Is the
IC001
O.K?
Yes
Is
voltage of D002
130V (270V)?
Yes
Is the
waveform of T001
pin5 correct?
Yes
Is
voltage of C130
80Vdc?
Yes
Is
voltage of C133
50Vdc?
A
No
Switch on
No
Check the power cord outlet
and diode D001,D002,D003,D004
No
Replace IC001
Trouble in diode
No
D001,D002,D003,D004
or peripheral device
Trouble in switching
No
power transformer T001
or IC001 and its ambient
circuit
No
Trouble in T001
or D130
No
Trouble in T001 or D131
27