Nokia 447ZiPlus - Vertical Scanning Issues

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