NEC MultiSync 20WGX2 Service Manual page 102

9. Checking the DC/DC Converter Circuit 9. Checking the DC/DC Converter Circuit
Che ck if Che ck if the 5V is output fr the 5V is output from P
Ch eck the output of 3.3V, 1.8V li Ch eck the output of 3.3V, 1.8V line voltage from
Printed w Print ed w ir ire broke between
and I308pow and I308
om P 303 p 303 pin 3, in 3, 4, 5 t 4, 5 to o
I307, I306 pin 3. I307, I306 pin 3.
O O K K
ne voltage from
I307, I306 pin 2. I307, I306 pin 2.
O O K K
Failure point Failure point
e broke between I307, I I307, I306 pin 2 306 pin 2
pow er supply pin. er supply pin.
Printed wire broke between P3 Print ed wire broke between P3 03 pin 3, 4,
N N G G
I307, I306 pin 3. I307, I306 pin 3.
N N G G
I307 , I306 I307
6 - 11 6 - 11
03 pin 3, 4, 5 and 5 and
Failure point Failure point
, I306failure failure