Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 57

5. Troubleshooting (continued) 5.3.9 Checking the DC/DC converter circuit: ACER A211H/A221HQ 55 Go to contents page Check the 5V is output from CN301 pin 9,10,11 OK NG Check the 5V is input to I301 pin3 OK NG Check the 3.3V is output from I301 pin2 OK NG Failure Point 1) Power wire disconnection. 2) Power board is failure. Failure Point Printed wire broke between CN301 pin 9, 10, 11 and I301 pin3. Failure Point I301 is failure or C303 is short. Check the 1.2V is input to D301 OK NG Failure Point Printed wire broke between D301 and L310. Printed wire broke between I301 pin2 and L308 L309. L308 L309 L310 open or C304 C338 C387 C380 C332 C333 C334 C330 C331 short. Failure Point D301 is failure or Q302 is failure or C307 is short.