Nokia 447ZiPlus - Micro-Control Malfunctions; Horizontal Width Control Malfunctions

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(8) MICRO CONTROL FUNCTION ABNORMAL
Is the
control function
working ?
Is the sync
signal on Pin
39/40 normal
?
MICRO CONTROL
ABNORMAL
Check Q550,
Q556
Check 5V on Pin 5 of I501
Check X510, D506, C506
PWB-0171
key control board
N
o
N
o
Yes
Yes
H. SIZE ABNORMAL
Is H.size
control function
working
Is voltage at
the base of
Q467 normal
?
Check Q502, I501
Check Q467, Q468,
Q470, C471, L471
Check
Q408, Q408A, Q502
(9)HORIZONTAL WIDTH CONTROL ABNORMAL
Yes
Yes
N
o
N
o