Checking The Resolution Change Ic Movement - NEC MultiSync LCD1550V Service Manual

9. Checking the resolution change IC movement

Is there +3.3V supply on U3 pins 65, 76, 86, 121, 143, 157, 167, 198, 193, 183, 179, 175, 188.
Is there +2.5V supply on U3 pins 5, 7, 10, 11, 12, 15, 18, 21, 22, 25, 28, 31, 35, 36, 42, 63, 76,
88, 119, 141, 159, 162, 163, 166, 169, 170, 189, 190, 196.
OK
Is 14.318MHz clock input to U3 pin 3, 4 at
TTL level.?
NG
Is 14.318MHz clock output from Y1 at TTL
level.?
OK
Proceed section 11 "Checking the
operation of CPU"
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NG
OK
Failure point
Y1 failure
6-14
Proceed section 11 "Checking the
operation of CPU"