Acer TravelMate 420 Service Manual

Also see for TravelMate 420: Guía del usuario Manuel d'utilisation Guia do utilizador

Contents

Acer TravelMate 420 Service Manual Manual pdf 90 page image

82 Chapter 4still occurs, continue next step.Replace the CPU with another of the same specifications. If the problems still occurs, go to nextstep.The main board may be damaged. Replace main board.3. If the external monitor has the same problem as the internal monitor, the main board may be damaged.Please insert the diagnostic disk and run the display test program and go through the sub-steps understep 2.Sound CheckTo determine if the computer’s built-in speakers are functioning properly, perform the following steps. Beforeyou start the steps below, adjust the speaker volume to an appropriate level.1. Try different audio sources. For example, employ audio CD and ditital music file to determine whether thefault is in the speaker system or not. If not all sources have sound problem, the problem is in the sourcedevices. If all have the same problem, continue next step.2. Connect a set of earphone or external speakers. If these devices work fine, go to next step. If not, then themain board may be defective or damaged. Replace the main board.3. Follow the disassembling steps in Chapter 3. Esure the speaker cable is firmly connected to the mainboard. If the speaker is still a malfunction, go on next step.4. If the speakers do not sound properly, the speakers may be defective or damaged. Replace the speakers.If the problem still occurs, then replace the main board.