Acer Travelmate 720 Service Guide

Chapter 3 73
Removing the Touchpad Bracket
1.  Remove the four screws of the touchpad bracket.
2.  Detach the bracket from the side latches.
3.  Detach the touchpad cable from the touchpad board.
4.  Remove the touchpad board from the upper case.
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74 Removal and Replacement
Disassembling the Lower Case
Removing the Floppy Disk Drive 
1.  Remove the three screws of the floppy disk drive.
2.  Lift the floppy disk drive from the lower case.
.
3.  Remove the two screws from the floppy frame.
4.  Separate the floppy disk drive from its frame.
.
5.  Carefully, disconnect the floppy cable from the floppy drive.
.
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Chapter 3 75
Disassembling the Fan 
1.  Disconnect the fan cable from the system board.
2.  Remove the four screws of the MMO shield.
3.  Lift the MMO shield away from the lower case.
4.  Remove the two screws of the fan.
5.  Separate the fan from the MMO shield.
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76 Removal and Replacement
Removing the System Board
1.  Remove the FIR lens from the lower case.
2.  Disconnect the DC-DC charger between the two pins at CN22 and CN23 
from the system board.
3.  Remove the system board away from the lower case.
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Chapter 3 77
Removing the IDE Board
1.  Remove the IDE board at CN30 from the system board.
Removing the PCMCIA Card
1.  Remove the four screws of the PCMCIA card.
2.  Remove the PCMCIA card at CN16 from the system board.
3.  This completes the disassembly procedure of the lower case.
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78 Removal and Replacement
Disassembling the LCD
1.  Remove the two cushions and three mylar stickers from the LCD bezel.
2.  Remove the five screws on the LCD bezel.
3.  Carefully, pull out the display bezel.
.
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Chapter 3 79
4.  Remove the two screws of the LED board.
5.  Pull out the LED board from the LCD.
6.  Disconnect the LED board cable from the LED board.
7.  Remove the internal microphone from the LCD.
8.  Remove the six screws from the inverter board.
9.  Lift the LCD and inverter board from the LCD panel.
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80 Removal and Replacement
10.  Remove the inverter board by disconnecting the LCD FPC cable.
11.  Remove the LCD power cable.
.
12.  Peel the tape off.
13.  Disconnect the LCD FPC cable from the LCD.
720.book  Page 80  Saturday, March 6, 1999  10:00 AM 

Chapter 4 81
TravelMate 720 has system checkouts, a list of error codes and messages 
with corresponding actions, and procedures for undetermined problems to 
help with troubleshooting.
Note: The diagnostic tests are intended to test only Acer products. Non-
Acer products, prototype cards, or modified options can give false 
errors and invalid system responses.
When troubleshooting, it is important to:
TObtain the failing symptoms in as much detail as possible.
TVerify the symptoms by attempting to...

82 Troubleshooting
Use the following table with the verified symptom to determine which page in 
this chapter to go to. Search the symptoms column and find the description 
that best matches your symptom; then go to the page shown in the “Go To” 
column.
Symptoms (Verified)Go To
Power failure. (The power indicator 
does not go on or stay on.)“Power System Checkout”.
POST does not complete. No beep or 
error codes are indicated.“Symptom-to-FRU Index”, and then 
use the No Beep Symptoms table.
POST beeps,...