NEC MultiSync 20WGX2 Service Manual page 101

8. Checking the Resolution Change IC Movement 8. Checking the Resolution Change IC Movement
Is Is there +3.3V supply on I307 3V3 powe there +3.3V supply on I307 3V3 powe r pi
O O K K
Is Is there +3.3V supply on I306 1V8 powe there +3.3V supply on I306 1V8 powe r pi
O O K K
Is 14.318MH z clock i Is 14.318MH z clock input to I nput to I308 pin 162 an
163 at TTL level during Pow 163 at TTL level duri
O O K K
Is +5.0V supplied to I308 pin 165 at low level Is +5.0V supplied to I308 pin 165 at low level
(Reset signal)? (Reset signal)?
O O K K
Failure point Failure point
I312failure I312failure
r pins ns
N N G G
r pins ns
N N G G
308 pin 162 an d pin d pin N N G G
ng Pow er On? er On?
N N G G
Proceed "9. Checking the D C/DC Proceed "9. Checking the D C/DC converter ci converter circuit
section. section.
Proceed "9. Check ing the DC/DC Proceed "9. Check ing the DC/DC converter ci converter circuit
section. section.
Is 14. Is 14.318M 318M Hz clock output Hz clock output from X301 pin 1 at from X301 pin 1 at TT
level during Powe level during Powe r On? r On?
O O K K
Failure point Failure point
Print wire broke b Print wir e broke b etween etween X301 X301pin 1 pin 1
and I308 and I308pin 162 pin 162 . .
Check the output of Check the output of 0V "L" pulse f 0V "L" pulse from SW rom SW 301.
O O K K
Failure point Failure point
Print wire broke between S Print wire broke between S W3 W3 01 01and
I308pin 165 I308 pin 165 . .
6 - 10 6 - 10
rcuit" "
rcuit" "
Failure point Failure point
TT L L N N G G
X3 01 X3 01failure
Failure point Failure point
301. N N G G
SW SW 30 30 1 1 failure
and
failure
failure