Checking The Ic Resolution Change Movement - NEC MultiSync LCD1700NX A Service Manual

8. Checking the IC Resolution Change Movement

Is there +3.3V supply on I315 pins D13, D15, D16, E17, G17, J17, L17, N17, R17, U17, U15, U13, U12,
U10, U8, U6, U5, T4, L4, B2, B6, B7, B8, B9, B11, C3, D3, E3, F2, F4, G1, G3, H1, J1 and J3?
NG
Proceed "Checking the DC/DC Converter Circuit" section.
OK
Is there +2.5V supply on I315 pins D12, D14, D17, F17, K17, M17, P17,
T17, U16, U14, U11, U9, U7, U4, N4, K4, A6, A7, A8, A9, A10 and A11?
NG
Proceed "Checking the DC/DC Converter Circuit" section.
OK
Is 24MHz clock input to I315 pin J4 at TTL level?
NG
Is 24MHz clock output from X303 pin 5 at TTL level?
OK
OK
Print wire broke between
X303 pin 5 and I315 pin J4.
Is +5.0V supplied to I315 pin T1 at
High level (Reset signal)?
NG
Check the output of 5.0V "H" pulse from I301 pin 6.
OK
OK
Failure point
I315 failure.
Failure point
Print wire broke between I301
pin 6 and I315 pin T1.
NG
Is +3.3V supplied to X303 pin 8?
Failure point
NG
Is 5.0V supplied to I301 pin 7?
NG
OK
Failure point
X303 failure.
NG
Failure point
OK
1) I322 failure.
2) L315 open.
Failure point
I301 failure.
6-13
Failure point
Print wire broke between and
X303 pin 8 and power
supply.