Acer AL1702 AL1702 Service Guide - Page 24

10. Checking the Audio circuit [OPTION] Check the Audio signal input to P309 NG OK Failure Point 1) Audio wire disconnection. 2) Audio Jack board failure. Check the 12V is input to I310 pin5, 6, 7, 8. NG OK Check the 12V is input to I311 pin15, 16. NG OK Check the VOLUME PWM signal input to I311 pin6. NG OK Check the MUTE signal is input to I311 pin12 at high level. NG OK Check the Audio output signal to Speaker. NG OK Failure Point I311 failure. Failure Point 1) Printed wire broke between P301 pin7. 8 and I310 pin1, 2, 3. 2) FB320 open. 3) Printed wire broke between I307 pin32 and I310 pin4. 4) Q311 failure. 5) I310 failure. Failure Point 1) Printed wire broke between I310 pin5, 6, 7, 8 and I311 pin15, 16. 2) L301 open. 3) C412 short. Failure Point 1) Printed wire broke between I305 pin74 and I311 pin6. 2) C422 short. 3) I305 failure. Failure Point 1) Prined wire broke between I307 pin33 and I311 pin12. 2) C414 short. 3) I307 failure. Failure Point 1) Speaker failure. 2) Prined wire broke between I311 pin14, 17 and P310. 3) C415, C418 open or short. AL1702 Page 22