NEC LCD1501-BK Service Manual page 50

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Is 3.3V voltage provided to pins 19 and 20 of J301 in
MAIN board?
NG
OK
Is a PCLK being outputted under the condition that
R304 in main BD?
NG
OK
Check the DE pulse is output on R405?
NG
OK
Check the PVD signal is ouput on R433 ?
NG
OK
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Is 3.3V voltage provided to pin 19
and 20 of J301.
OK
Failure point
J301 cable pulled out or disconnected
6-4
NG
Check Q301and IC301
Failure point
1) IC401 failure.
2) Printed wire broke between
IC401 and IC301 pin31.
3) R431;C312 or R304 failure
Failure point
1) IC401 failure.
2) Printed wire broke between
IC401 and IC301 pin30.
3) R405 or C313 failure
Failure point
1) IC401 failure.
2) Printed wire broke between
IC401 and IC301 pin28.
3) R433, C314 failure.
Failure point