Acer Extensa 390 Service Guide

4-10Service Guide4.5 Removing the Keyboard
Follow these steps to remove the keyboard:
1.Slide out the two display hinge covers on both sides of the notebook.Figure 4-8Removing the Display Hinge Covers
2.Using a pointed instrument, unlock the keyboard locks.  Then pull out and flip down the
keyboard to expose the keyboard connectors.Figure 4-9Removing the Keyboard 

Disassembly and Unit Replacement4-11 3.Unplug the keyboard connectors (CN3 and CN5) from the keyboard/touchpad board.  Set
aside the keyboard.Figure 4-10Unplugging the Keyboard Connectors 

4-12Service Guide4.6 Disassembling the Inside Frame Assembly
This section discusses how to disassemble the housing, and during its course, includes removing
and replacing of certain major components like the internal drive (CD-ROM or floppy), CPU and
the main board.  Follow these steps:
4.6.1 Removing the Heat Sink Assembly
Follow these steps to remove the heat sink assembly:
1.Pull up and remove the LED cover.Figure 4-11Removing the LED Cover
2.Remove the five screws that secure the heat sink assembly...

Disassembly and Unit Replacement4-13 4.6.2 Removing the Display
Follow these steps to remove the display:
1.Remove two screws on the bottom and two screws on the rear of the unit.Figure 4-13Unplugging the Display Cable
2.Open the display and remove two screws; then pull up the display cable (CN9) and unplug the
inverter cable (CN8).Figure 4-14Removing the Display Hinge Screws 

4-14Service Guide3.Detach the display from the main unit and set aside.Figure 4-15Removing the Display Hinge Screws
4.6.3 Removing the Internal Drive
Follow these steps to remove the internal drive:
1.Pull up the FDD/CD module latches.
2.Unplug the two internal drive cables (CN17 for FDD; CN17 and CN20 for CD-ROM).
3.Pull out the internal drive and set it aside.Ensure the drive cables do not become hooked on the inside frame assembly
when removing and reinstalling the drive. 

Disassembly and Unit Replacement4-15Figure 4-16Removing the Internal Drive
4.6.4 Replacing the CPU
Gently pull out the CPU heat sink and the CPU board (CN21) from the mainboard.Figure 4-17Replacing the CPU
Reverse the steps above to insert a replacement CPU. 

4-16Service Guide4.6.5 Detaching the Top Cover
Follow these steps to detach the top cover from the bottom cover:
1.Unplug the touchpad cable (CN6) from the keyboard/touchpad board, and the audio board
cable (CN14), speaker cables (CN13 and CN15) and optionally, the fan connector found just
above the speaker cables (CN12) from the mainboard.Figure 4-18Removing Cables
2.Detach the top cover from the bottom cover.Figure 4-19Detaching the Top Cover 

Disassembly and Unit Replacement4-17 4.6.6 Removing the Mainboard
Follow these steps to remove the mainboard:
1.Remove the screws found on the lower case (ten total screws, two screws shorter than the rest
found on the front corners of the computer).Figure 4-20Removing the Bottom Screws
2.Remove the keyboard/touchpad board (CN18).  Remove two screws and remove the plate
that covers the DC-DC converter board.Figure 4-21Removing the Keyboard/Touchpad Board and DC-DC Converter Board Cover 

4-18Service Guide3.Gently remove the DC-DC converter board (CN7).Figure 4-22Removing the DC-DC Converter Board
4.Unplug the battery charger connector (CN22) and remove four screws that secure the
motherboard to the base assembly.  Then pull up to remove the mainboard.Figure 4-23Removing the Mainboard 

Disassembly and Unit Replacement4-19 4.6.7 Disassembling the Mainboard
Follow these steps to disassemble the mainboard:
REMOVING THE CHARGER BOARDUnplug the charger board (containing the power switch, DC-in jack and PS/2 port).Figure 4-24Removing the Charger Board
REMOVING THE PCMCIA SOCKETSThe PC Card Connector Module is normally part of the motherboard spare part.  The following
removal procedure is for reference only.Figure 4-25Removing the PCMCIA Sockets