Nokia 447ZiPlus - Horizontal Sync Loss Diagnosis

31
Is the
waveform at
Pin 33 of I401
normal ?
Is the
waveform at
Pin 39 of I501
normal
?
Loss of horizontal
synchronization
Check I401
C414, R409,
C468
Check Q550,
C550, R551,C551
Check I501
N
o
N
o
Yes
Yes
(6) Loss of Horizontal Synchronization