Acer AL1702 AL1702 Service Guide - Page 23

9. Checking the DC/DC converter circuit AL1702 Check the 5V is output from P301 pin1, 2 NG OK Check the 5V is input to I302 pin3. NG OK Check the 3.3V is output from I302 pin2, 4. NG OK Failure Point 1) Power wire disconnection. 2) Power board is failure. Failure Point 1) Printed wire broke between P301 pin1. 2 and I302 pin3. 2) FB301, FB302 open. Failure Point I302 is failure. Check the 5V is input to I301 pin3. NG OK Check the 2.5V is output from I301 pin2, 4. NG OK Failure Point 1) Printed wire broke between I301 pin2. 4, I302 pin2, 4 and I305 MST8111A power supply pin. 2) FB314, FB315, FB316, FB317, FB318, FB319 open. Failure Point 1) Printed wire broke between P301 pin1. 2 and I301 pin3. 2) FB301, FB302, FB305 open. Failure Point I301 is failure. Page 21