Nokia 447ZiPlus Service Manual page 34

(7) No Vertical Scanning (One Horizontal Line)
No
R334 is defective.
No
Check R347, R348
No
Check C302, C338,
R347, R348
No
Check C328
No vertical scanning
Is the
waveform at
Pin 5 of I330
normal ?
No
Are the
voltages at Pin
2 of I330 14V
Pin 4 of I330
-9V ?
Yes
Is the
voltage at Pin 7 of
I330 normal
(1.8V) ?
Yes
Is the
waveform at
Pin 23 of I401
normal
?
No
Is the voltage
at Pin 21 of
I401 normal
?
Yes
voltage at Pin
22 of I401
normal
?
Yes
I401 is defective
32
Yes
Deflection yoke is defective.
Yes
I330 is defective.