Acer Travelmate 720 Service Guide
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Chapter 4 93 Keyboard (one or more keys) does not work.1. Reseat the keyboard cable. 2. Keyboard 3. System board Power shuts down during operation.1. Battery 2. AC Adapter 3. DC/DC & Charge board 4. System board The system will not power- on.1. Battery 2. AC adapter 3. DC/DC & Charge boar 4. System board The system will not power- off.1. DC/DC & Charge board 2. System board Battery can’t be charged. 1. Battery 2. DC/DC & Charge board 3. IDE board 4. System board System cannot detect the PCMCIA.PCMCIA slots assembly System board Memory count (size) appears different from actual size.1. Enter BIOS Utility to execute load setup default settings, then reboot system. 2. DIMM 3. System board Speakers have noise or no sound comes from system.1. Speaker 2. System board The system will not enter Hibernation.1. Keyboard (if control is from the keyboard) 2. Hard disk 3. System board The system will not enter Standby after closing the LCD.1. LCD cover switch 2. System board Battery fuel gauge does not go higher than 90%.1. Remove battery pack and let it cool for 2 hours. 2. Refresh battery (continue to use battery until power off, then charge battery). 3. Battery 4. DC/DC & charge board 5. System board System configuration does not match the installed devices.1. Enter BIOS Utility to execute load setup default settings, then reboot system. 2. Reseat CD-ROM/DVD module. System hangs intermittently. 1. Hard Disk/CD-ROM/DVD drive connector 2. Fan 3. System board Symptom / ErrorFRU / Action in Sequence 720.book Page 93 Saturday, March 6, 1999 10:00 AM
94 Troubleshooting In DOS or Windows multimedia programs, no sound comes from the computer. 1. Speaker 2. System board External display does not work correctly.System board USB does not work correctly. System board Print problems 1. Run printer self-test. 2. Printer driver 3. Printer cable 4. System board Serial or parallel port device problems1. Device driver 2. Device cable 3. Device 4. System board Symptom / ErrorFRU / Action in Sequence 720.book Page 94 Saturday, March 6, 1999 10:00 AM
Chapter 4 95 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 shown by the FRU code. Rerun the test to verify that no more errors exist. 720.book Page 95 Saturday, March 6, 1999 10:00 AM
96 Troubleshooting Undetermined Problems You are here because the diagnostic tests did not identify which adapter or device failed, installed devices are incorrect, a short circuit is suspected, or the system is inoperative. Follow these procedures to isolate the failing FRU (do not isolate a nondefective FRU). Note: Verify that all attached devices are supported by the computer. Note: Verify that the power supply being used at the time of the failure is operating correctly (See “Power Systems Checkout”).: 1. Power off the computer. 2. Visually check them for damage. If any problems are found, replace the FRU. 3. Remove or disconnect all of the following devices: a. Non-Acer devices b. Devices attached to the port replicator c. Printer, mouse, and other external devices d. Battery pack e. Hard disk drive f. DIMM g. CD-ROM h. Diskette drive i. PC Cards 4. Power on the computer. 5. Determine if the problem has changed. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace each following FRU one at a time. Do not replace a nondefective FRU: a. System board b. LCD assembly c. CPU card 720.book Page 96 Saturday, March 6, 1999 10:00 AM
Chapter 4 97 Utility Program Diskette Setting LCD Panel ID There is an EEPROM in the inverter which stores its supported LCD type ID code. If you replace an LCD with one of a different brand or use a new inverter, the ID information in the inverter EEPROM should be updated. Follow the steps below to see the LCD Panel ID: 1. Follow the instructions on-screen to read current or to set new LCD Panel ID code. Note: When you set a new LCD Panel ID and the new LCD is not yet enabled (to function), connect an external CRT to see the program execution process. Note: Make sure the new ID code you choose corresponds with the LCD brand and type. If you write a wrong ID into the inverter, just reboot and re-execute the program and input the correct ID code. 2. Restart the computer - the new LCD should work normally. Note: If LCD cannot display after changing the ID code, make sure you write the correct ID code, or try reseating the LCD FPC cable connectors. Setting Thermal Sensor Utility The system is equipped with sensors to protect against system overheating. By setting System and processor thermal thresholds, the system can turn on the cooling fan or shut down automatically when temperatures reach the defined threshold parameters. 720.book Page 97 Saturday, March 6, 1999 10:00 AM
98 Troubleshooting Running the Diagnostics Running PQA Diagnostics Program Note: Before running the PQA Diagnostics Program, make sure that the write enable tab of the Diagnostic Program Diskette is set to enabled. Press -> or
Chapter 4 99 Auto Test performs multiple tests of the selected items and automatically checks the selected test items in sequence. Note: PCMCIA Diagnostic Supports the Manual test only. Do not select PCMCIA Diagnostic in Auto Test. 720.book Page 99 Saturday, March 6, 1999 10:00 AM
100 Troubleshooting The screen below appears if you select AUTO Test. Specify the desired number of tests and press Enter. After you specify the number of tests to perform, the screen shows a list of test items (see below): . Move the highlight bar from one item to another. Press space to enable or disable the item. Press Enter to view the available suboptions of each selected item. Press Esc to close the submenu. The right corner screen information gives you the available function keys and the specified test number. • Space Enables/disables the item • ESC Exits the program • F1 Help • F2 Tests the selected item(s) • Enter Opens the available suboptions • Test Times Indicates the number of tests to perform. Note: The F1 and F2 keys function only after you finish configuring the Test option. PQA Vx_x xx-xx-xx DiagResult SysInfoOption Exit DiagMANUAL TEST AUTO TEST TEST COUNT VALUE (1...9999) 1 PQA Vx_x xx-xx-xx DiagResoult SysInfoOption ExitDiagMANUAL TEST AUTO TESTTest Items [ ] Sytem Board [ ] Memory [ ] Keyboard [ ] Video [ ] Parallel Port [ ] Serial Port [ ] Diskette Drive [ ] Hard Disk [ ] CD-ROM [ ] Coprocessor [ ] Pointing Dev. [ ] Cache SPACE: mark/ummark selecting item ESC : return to upper menu F2 : test the marked item(s) ENTER: open subitem’s menu Test Times = 1 720.book Page 100 Saturday, March 6, 1999 10:00 AM
Chapter 4 101 PQA Diagnostics Program Error Codes and Messages Error CodeMessageFRU/Action in Sequence System 16XX Backup battery error Backup battery 1XXX CPU or System board error1. Reload BIOS default setting. 2. CPU 3. System board 2XXX Memory error 1. Reseat CPU (IMM module). 2. DIMM 3. System board 3XXX Keyboard error 1. Reseat Keyboard. 2. Keyboard 3. System board 4XXX Video error System board 5XXX Parallel Port error System board 6XXX Serial port or System board errorSystem board 7XXX Diskette drive error 1. Diskette drive 2. System board 8XXX Hard disk error 1. Reload BIOS default setting. 2. Hard disk 3. System board 9XXX CD-ROM error 1. Reseat CD-ROM cable. 2. CD-ROM drive 3. System board 10XXX CPU or System board error1. CPU 2. System board 11XXX Pointing device error 1. Reseat Keyboard. 2. Keyboard 3. System board 720.book Page 101 Saturday, March 6, 1999 10:00 AM
102 Troubleshooting 720.book Page 102 Saturday, March 6, 1999 10:00 AM