NEC DSC-3261HA Service Manual page 17

4. NO VERTICAL SCANNING(ONE HORIZONTAL LINE RASTER)
Check
DY Connector
Check
Input Voltage of I301
NORMAL
Check
Vertical input(Vin+, Vin-)
of I301
Check
Vertical output
(Vout+, Vout-) of I301
NORMAL
Check
output of I301
Check/Replace
peripheral componennts
of I301
ABNORMAL
ABNORMAL
ABNORMAL
Check/Replace
I301
16
Trouble Shooting Charts
Check/Replace
D406, D403"
48V line, 19V line
Check
34, 35th pin of I701
Check/Replace
I701