Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 47

5. Troubleshooting (continued) ACER A211H/A221HQ 45 Go to contents page 5.2.9 Checking the DC/DC converter circuit: Check the 5V is output from CN301 pin 9,10,11 OK NG Failure Point 1) Power wire disconnection. 2) Power board is failure. Check the 5V is input to I301 pin3 OK NG Check the 3.3V is output from I301 pin2 OK NG Check the 3.3V or 2.6V is input to I302 pin3 OK NG Check the 1.2V is output from I302 pin2 OK NG Failure Point Printed wire broke between I302 pin2 and L308 L310. Printed wire broke between I301 pin2 and L307 L309 L311 L307 L309 L311 L308 L310 open or C345 C346 C347 C350 C351 C352 C356 C357 C348 C349 C382 C353 C354 C355 short. Failure Point Printed wire broke between CN301 pin 9, 10, 11 and I301 pin3. Failure Point I301 is failure or C304 is short. Failure Point Printed wire broke between I301 pin2 and I302 pin3. Or both D313 and L313 open or C307 short. Failure Point I302 failure or both C308 and C310 short..