Acer Aspire 8940G Acer Aspire 8940 Service Guide - Page 211

USB (Right Up/Down Side) Failure If the right-side USB fails, perform the following actions one at a time to correct the problem. Do not replace non-defective FRUs: Start OK Check USB/B to M/B cable OK Check USB/B Re-assemble the NG USB/B cable to M/B OK Swap USB/B and NG USB cable Swap M/B Other Failures If the CRT Switch, Dock, LAN Port, external MIC or Speakers, PCI Express Card, 5-in-1 Card Reader or Volume Wheel fail, perform the following general steps to correct the problem. Do not replace non-defective FRUs: 1. Check Drive whether is OK. 2. Check Test Fixture is ok. 3. Swap M/B to Try. Intermittent Problems Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a recurring problem exists. When analyzing an intermittent problem, do the following: 1. Run the advanced diagnostic test for the system board in loop mode at least 10 times. 2. If no error is detected, do not replace any FRU. 3. If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors. Chapter 4 201