NEC AccuSync LCD71VM - Checking the Scaling IC Movement

6-10
7. Checking the Scaling IC Movement
Is there +3.3V supply on U405 pins 14, 30, 90, 104, 106, 108, 110, 113,115, 124, 128, 132,
136, 143, 157. Is there +2.5V SUPPLY ON U405 pins 20, 43, 46, 59, 61, 63, 74, 77, 79, 98,
117, 119, 138.
NG
OK
Is 14.318M Hz clock input to U405 pins 102,
103 at TTL level?
NG
OK
OK
Proceed section 8 "No Power On".
Is 14.318M Hz clock output from X401 at TTL level?
Failure point
X401 failure
U405 failure.