Acer Travelmate 4050 Service Guide

Chapter 454
Check the Power Adapter
Unplug the power adapter cable from the computer and measure the output voltage at the plug of the power 
adapter cable. See the following figure
1.If the voltage is not correct, replace the power adapter.
2.If the voltage is within the range, do the following:
TReplace the main board.
TIf the problem is not corrected, see “Undetermined Problems” on page 62.
TIf the voltage is not correct, go to the next step.
NOTE: An audible noise from the power adapter does not...

55Chapter 4
Check the Battery Pack
To check the battery pack, do the following:
From Software:
1.Check out the Power Options in control Panel
2.In Power Meter, confirm that if the parameters shown in the screen for Current Power Source and Total 
Battery Power Remaining are correct.
3.Repeat the steps 1 and 2, for both battery and adapter.
4.This helps you identify first the problem is on recharging or discharging.
From Hardware:
1.Power off the computer. 
2.Remove the battery pack and measure the...

Chapter 456
still occurs, continue next step.
Replace the CPU with another of the same specifications. If the problems still occurs, go to next 
step.
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 under 
step 2.
Sound Check
To determine if the computer’s built-in speakers are functioning properly,...

57Chapter 4
Insyde MobilePro BIOS POST Beep Code and POST Messages
The POST error message index lists the error message and their possible causes. The most likely cause is 
listed first.
NOTE: Perform the FRU replacement or actions in the sequence shown in FRU/Action column, if the FRU 
replacement does not solve the problem, put the original part back in the computer. Do not replace a 
non-defective FRU.
This index can also help you determine the next possible FRU to be replaced when servicing a...

Chapter 458
N/A“PARITY ERROR AT 
UNKNOWN
LOCATION”Parity error during memory test at unknown 
location.
N/A “PARITY ERROR AT LOCATION 
XXXXXX”Parity error during memory test at the indicated 
location.
N/A “NO INTERRUPTS FROM TIMER 0” Timer 0 of the clock timer controller does not 
generate system interrupts correctly.
N/A “UNEXPECTED AMOUNT OF 
MEMORY - RUN SCU”The system memory size does not match with 
the CMOS record.
N/A “CLOCK NOT TICKING CORRECTLY” The system clock does not working correctly.
N/A...

59Chapter 4
Index of Symptom-to-FRU Error Message
LCD-Related Symptoms
Symptom / ErrorAction in Sequence
LCD backlight doesnt work
LCD is too dark
LCD brightness cannot be adjusted
LCD contrast cannot be adjustedEnter BIOS Utility to execute “Load Setup Defaults” on Exit screen, 
then reboot system.
Reconnect the LCD connectors.
Keyboard (if contrast and brightness function key doesnt work).
LCD cable
LCD inverter
LCD
Main board
Unreadable LCD screen 
Missing pels in characters
Abnormal screen 
Wrong...

Chapter 460
PCMCIA-Related Symptoms
Symptom / ErrorAction in Sequence
System cannot detect the PC Card (PCMCIA)  PCMCIA slot assembly
Main board
PCMCIA slot pin is damaged. PCMCIA slot assembly
Memory-Related Symptoms
Symptom / ErrorAction in Sequence
Memory count (size) appears different from 
actual size.DIMM
Main board
Speaker-Related Symptoms
Symptom / ErrorAction in Sequence
In Windows, multimedia programs, no sound 
comes from the computer. See “Sound Check” on page 56
Audio driver
Speaker
Main...

61Chapter 4
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 62. Peripheral-Related Symptoms
Symptom / ErrorAction in Sequence
System configuration does not match the 
installed devices. Enter BIOS Setup Utility to execute “Load Setup defaults”, then 
reboot system.
Reconnect hard disk/CD-ROM/diskette drives.
External display does not work correctly. See if there is an error beep. If there is an erro beep, then change 
main board....

Chapter 462
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, 
whether a short circuit is suspected, or whether the system is inoperative.  
Follow these procedures to isolate the failing FRU (do not isolate non-defective 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 
System Check” on...

Chapter 563
Top View
 
ItemDescriptionItemDescription
JP1 CRT CONN                    JP17 ODD CONN
JP2 Parallel Port  JP18 SPK CONN
JP3 IEEE1394 CONN JP19 TP/B CONN 
JP4     TV-OUT CONN JP20 MIC JACK 
JP5 RJ11/RJ45 CONN JP22  K/B CONN 
JP6 USB CONN X 2  JP23 PHONE JACK 
JP7 CPU FAN CONN JP16 HDD CONN 
JP8 USB CONN  SW1 LID SWITCH 
JP9 POWER/B CONN SW3  KILL SWITCH 
JP10 LVDS CONN U12 NB
JP11 MBC CONN  PCN1  AC JACK
JP12 CPU Socket  PJP9 BATT COMM
JP13 MINIPCI CONN    JP24 LED/B CONN  
JP15 CraBus CONN...