Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 34

32 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.1.9 Checking the DC/DC converter circuit: Check the 5V is output from P301 pin 4,5,6. OK NG Failure Point 1) Power wire disconnection. 2) Power board is failure. Check the 5V is input to I304 pin3. OK NG Failure Point Printed wire broke between P301 pin 4,5,6 and I304 pin3. Check the 3.3V is output from I304 pin2,4 OK NG Failure Point I304 is failure or C308 short. Check the 3.3V is input to I305 pin3. OK NG Failure Point Printed wire broke between I304 pin2. 4 and I305 pin3. Check the 1.2V is output from I305 pin2,4. OK NG Failure Point Printed wire broke between I304 pin2,4, I305 pin3 Failure Point I305 failure or C311 short.