Nokia 447ZiPlus Service Manual page 30

(2) No Video (raster appear)
No
Check signal cable,
C901, C931, C961
No
Check video circuit
voltages on
Pin 1,3,5 of I904.
Check 12V lines
Check 75V lines.
No Video(raster appear)
Are the
waveforms at
pin 2,6,11 of
I901 Normal
?
Yes
Are the
voltages at pin
15 of I901
normal ?
Yes
Are the
waveforms at
pin 35,32,29 of
I901 normal ?
Yes
Are the
waveforms at
cathode R/G/B
of CRT normal
?
Yes
CRT is defective.
28
No
Check ABL line from PCB
No
Is
pin
The voltage at
17 of I901
normal ?
I901 is defective
No
Check D941
Yes