Acer Aspire 4935 Service Guide

Chapter 4151
Sound Problems
If sound problems are experienced, perform the following actions one at a time to correct the problem.
1.Reboot the computer.
2.Navigate to Start´ Control Panel´ System and Maintenance´ System´ Device Manager. Check 
the Device Manager to determine that:
•The device is properly installed. 
•There are no red Xs or yellow exclamation marks. 
•There are no device conflicts. 
•No hardware is listed under Other Devices.
3.Roll back the audio driver to the previous version, if...

152Chapter 4
Internal Microphone Failure
If the internal Microphone fails, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Microphone Problems
If internal or external Microphones do no operate correctly, perform the following actions one at a time to 
correct the problem.
1.Check that the microphone is enabled. Navigate to Start´ Control Panel´ Hardware and Sound´ 
Sound and select the Recording tab.
2.Right-click on the Recording tab and select...

Chapter 4153
HDD Not Operating Correctly
If the HDD does not operate correctly, perform the following actions one at a time to correct the problem. 
1.Disconnect all external devices.
2.Run a complete virus scan using up-to-date software to ensure the computer is virus free. 
3.Run the Windows Vista Startup Repair Utility:
a.insert the Windows Vista Operating System DVD in the ODD and restart the computer. 
b.When prompted, press any key to start to the operating system DVD. 
c.The Install Windows screen...

154Chapter 4
ODD Failure
If the ODD fails, perform the following actions one at a time to correct the problem. Do not replace a non-
defective FRUs:
ODD Not Operating Correctly
If the ODD exhibits any of the following symptoms it may be faulty:
•Audio CDs do not play when loaded 
•DVDs do not play when loaded 
•Blank discs do not burn correctly 
•DVD or CD play breaks up or jumps 
•Optical drive not found or not active: 
•Not shown in My Computer or the BIOS setup 
•LED does not flash when the computer...

Chapter 4155
a.Double-click lDE ATA/ATAPI controllers. If a device displays a down arrow, right-click on the device 
and click Enable.
b.Double-click DVD/CD-ROM drives. If the device displays a down arrow, right-click on the device and 
click Enable.
c.Check that there are no yellow exclamation marks against the items in l D E  ATA / ATA P I  c o n t r o l l e r s. If 
a device has an exclamation mark, right-click on the device and uninstall and reinstall the driver.
d.Check that there are no yellow...

156Chapter 4
b.Double-click IDE ATA/ATAPI controllers, then right-click ATA Device 0. 
c.Click Properties and select the Advanced Settings tab. Ensure that the Enable DMA box is 
checked and click OK. 
d.Repeat for the other ATA Devices shown if applicable.
Drive Not Detected
If Windows cannot detect the drive, perform the following actions one at a time to correct the problem.
1.Restart the computer and press F2 to enter the BIOS Utility. 
2.Check that the drive is detected in the ATAPI Model Name field...

Chapter 4157
USB Failure (Rightside)
If the rightside USB port fails, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Modem Function Failure
If the internal Modem fails, perform the following actions one at a time to correct the problem. Do not replace a 
non-defective FRUs: 

158Chapter 4
Wireless Function Failure
If the WLAN/WiMAX fails, perform the following actions one at a time to correct the problem. Do not replace a 
non-defective FRUs:
Bluetooth Function Failure
If the Bluetooth fails, perform the following actions one at a time to correct the problem. Do not replace a non-
defective FRUs:
Start
Reconnect the
Antenna to  the
cardCheck Antenna to
WLAN/WiMAX C ard
Check AntennaSwap the Antenna
Check WLAN/Wi MAX
CardSwap WL AN/
WiMAX Card
Check Function BoardSwap...

Chapter 4159
EasyTouch Button Failure
If the Acer EasyTouch buttons fail, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Media Board Failure
If the Media Board fails, perform the following actions one at a time to correct the problem. Do not replace a 
non-defective FRUs:
Start
Reconnect the
Function/B to MB
FFC cableCheck Function/B to
MB connection
Check Function/B
and FFCSwap the Function
Board
Swap Mainboard
OK
OK
NG
NG 

160Chapter 4
Fingerprint Reader Failure
If the Fingerprint Reader fails, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Thermal Unit Failure
If the Thermal Unit fails, perform the following actions one at a time to correct the problem. Do not replace a 
non-defective FRUs:
Start
Reconnect the
cable to the
MainboardCheck Fan pow er cable
Check FanSwap the Therm al
Module
CPU Heatink w ell
seat ed?Seat it well
Check CPUSwap CPU
Swap Mainboard
OK...