H-CHAP6 MEDION A440_Service_Manual.pdf

Troubleshooting and Repair

Introduction

This chapter provides the most common problem encountered with the A440 notebook

computer and some troubleshooting means. Some of the common problems are:

Introduction

•

System BIOS Related Problems

•

LCD Display Problems

•

System Power and Boot-Up Problems

•

External Interface Problems (Serial, Printer, CRT, IR, USB, PS/2)

•

Audio Problems

•

PCMCIA Problems

•

Power Management Problems

•

Input Device Problems (Keyboard and Glidepad)

6.1.1 HelpfulStarters

Here are a few helpful starters to begin with before troubleshooting the notebook:

•

Is there any external power source connected to the computer?

•

Does the battery installed been fully charged?

•

Is the computer turn on and the POWER LED activated?

•

Are all cables connected properly and securely?

•

Are all needed device drivers been installed properly?

•

Have you checked your AUTOEXEC.BAT and CONFIG.SYS files for errors?

•

Is the Power Management function enabled under BIOS Setup? Press any key to

wake system up again.

6.2

System BIOS Related Problems

This section provides you with information on how the BIOS handles errors encountered

during POST (Power On Self Test) and translate them to beep codes and error messages.

Refer to this whenever you encounter error messages or beep codes generated by the

computer during startup.

System BIOS Related Problems

6.2.1 POSTMessages

The following is a summary of the Phoenix BIOS startup error messages that is displayed

on the notebook’s screen. These messages help you in understanding some of the

notebook’s problems that may be corrected by entering the BIOS SETUP program and

checking the original values.

FIC A440 Series Service Manual

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Chapter

6.1

6.1 Introduction

6.2

6.2 System BIOS Related Problems

Troubleshooting and Repair

Table 6-1(a) POST Error Messages

Message

Possible Cause

Action

Diskette drive A failure

The drive failed or is missing.

Floppy Disk Controller is

disabled.

Check the drive to determine the

problem.

Enabled the FDD Controller.

Diskette read failure - press

F1 to retry boot, F2 for

SETUP utility

The diskette is either not

formatted or is defective.

Replace the diskette with a

bootable diskette and retry.

Display adapter failed,

using alternate

The primary video adapter

failed.

Check the primary video

adapter.

Gate A20 failure

The keyboard controller is not

accepting command,

specifically, the enable and

disable A20 command.

Check the keyboard controller

and system board. Turn the

power off, then back on again. If

the problem persists contact

qualified service personnel.

Fixed disk configuration

error

The specified configuration is

not supported or doesn't

match the actual hardware

installed.

Correct the fixed disk

configuration.

Fixed disk controller failure The fixed disk may be

defective.

Try rebooting. If that doesn't

work, replace the fixed disk.

Fixed disk read failure-

press F1 to retry boot, F2

for SETUP utility

The fixed disk may be

configured incorrectly or is

defective.

Check the drive type selected in

SETUP. Try rebooting. If that

does not work, replace the fixed

disk.

Pointer device failure

The PS/2-style mouse failed. Try rebooting. If problem

persists, check the mouse, it's

cable and connector.

No boot device available -

press F1 to retry boot, F2

for SETUP utility

Either diskette drive A:, the

fixed disk, or both the

diskette and fixed disk are

defective.

Try rebooting. If problem

persists, replace the diskette or

the fixed disk.

No boot sector on fixed

disk – press F1 to retry

boot, F2 for SETUP utility

The C: drive is not formatted

or is not bootable.

Format the C: drive and make it

bootable.

Not a boot diskette - press

F1 to retry boot, F2 for

SETUP utility

The diskette in drive A: is not

formatted as a bootable

diskette.

Replace the diskette with a

bootable diskette and try

rebooting.

No timer tick interrupt

The timer chip has failed.

Check the system board, Turn

the power off, then back on

again. If the problem persists,

contact qualified service

personnel.

Shutdown failure

Either the keyboard controller

is not accepting the reset

command or the associated

reset logic has failed.

Check the keyboard controller

and system board. Turn the

power off, then back on again. If

the problem persists, contact

qualified service personnel.

Time of day not set - run

SETUP program

Real Time Clock not set.

Run SETUP utility.

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FIC A440 Series Service Manual

Troubleshooting and Repair

Table 6-1(b) POST Error Messages

Message

Possible Cause

Action

Timer 2 failure

The timer chip has failed.

Check the system board. Turn

the power off, then back on

again. If the problem persists,

contact qualified service

personnel.

F2 to enter ROM-based

SETUP

Invalid configuration

information must be changed.

You must run SETUP utility and

correct configuration

information.

Invalid configuration

information - please run

SETUP

Display adapter is configured

incorrectly.

Memory size is incorrect.

Wrong number of diskette

drives.

Other configuration errors.

Run the SETUP utility.

Keyboard clock line failure The keyboard, the keyboard

cable connection, or the

keyboard controller is

defective.

Make sure the keyboard cable

and keyboard are connected

properly. Check the keyboard

controller and the system

board. Turn the power off, then

back on again. If the problem

persists, contact qualified

service personnel.

Keyboard data line failure

The keyboard controller

firmware has failed.

Check the keyboard controller

and system board. Turn the

power off, then back on again.

If the problem persists, contact

qualified service personnel.

Keyboard stuck key failure A key is jammed.

Locate the jammed key and fix

it. Make sure the keyboard

cable and keyboard are

connected properly. Turn the

power off, then back on again.

If the problem persists, contact

qualified service personnel.

Memory failure at hex-

value , read hex-value ,

expecting hex-value

Circuitry associated with the

memory chips has failed.

Turn the power off, then back

on again. If the problem

persists, contact qualified

service personnel.

Unexpected interrupt in

protected mode

Hardware interrupt or NMI

occurred while in protected

mode.

Check the timer chip or the

interrupt controller on the

system board.

Real time clock failure

The RTC or battery failed.

Run SETUP and turn the power

off and on. If the problem

persists, replace the RTC

battery. If the problem remains,

contact qualified service

personnel.

FIC A440 Series Service Manual

6-3

Troubleshooting and Repair

6.2.2 InformationalMessages

This section lists the messages that provide information to the user but require no action.

Table 6-2

BIOS Informational Messages

Message

Meaning

nnn K Base Memory

The amount of base memory that tested successfully.

nnn K Extended

The amount of extended memory that tested successfully.

Memory tests terminated by

keystroke

The message indicates that a user pressed the spacebar

while memory tests were running and stopped the

memory tests.

Press the F1 key to continue

This message indicates that an error was found during

POST. Pressing the F1 key allows the system to attempt

to reboot.

Beginning memory test Press the

SPACEBAR to terminate the

memory test

A user can stop the memory tests by pressing the

spacebar.

Press the F1 key to continue, F2

to run the Setup utility

This message indicates that an error was found during

POST. Pressing the F1 key allows the system to attempt

to boot. Press F2 allows users to run the ROM-based

SETUP utility to correct configuration information.

6.2.3 BeepCodes

Beep codes are used to identify a POST error that occurs when the screen is not available.

Once the screen is operating, diagnostic messages are reported to the screen. There are beep

codes for both fatal and non-fatal system board errors.

No beep code is generated if a test is aborted while in progress. However,

diagnostic cards can be installed in order to display the contents of the

diagnostic port 80h and identify the area of failure.

Explanation of test terms for beep code table

The following terms are used in the Test Performed column of the beep code table:

1. Pattern test - One or more particular patterns are written to a location then read back

from the same location. Examples of patterns used are 55h and AAh. If the value read

does not match the value written, the test is considered a failure.

2. Rolling ones test - Several patterns are constructed. These patterns represent a one rolling

through the given location. For example, to roll a one through three bits, the following

patterns would be constructed: 001, 010, 011, 100, 101, 110, and 111. The patterns are

written to the location and then read back, one by one. If the value read does not match

the value written, the test is considered a failure.

3. Rolling zeros test - Several patterns are constructed. These patterns represent a zero

rolling through the given location. For example, to roll a zero through three bits, the

following patterns would be constructed: 011, 001, and 000. The patterns are written to

the location and then read back, one by one. If the value read does not match the value

written, the test is considered a failure.

4. Checksum test - All of the values in a given range of locations are added together. The

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FIC A440 Series Service Manual

Troubleshooting and Repair

range includes a location which when added to sum of the ranges, will produce a known

result, such as zero.

Beep codes for system board errors

Table 6-3 (a) BIOS Beep Codes

Beep

Code

Diagnostic

Code

Description

Test Performed

none

01h

CPU registers test in

progress or failure

Pattern test of most of the 16-bit CPU

registers. Failure will result in a system

halt.

1-1-3

02h

CMOS write/read test in

progress or failure.

Rolling ones test in the shutdown byte

(offset 0Eh) of the CMOS RAM. Failure

will result in a system halt.

1-1-4

03h

ROM BIOS checksum test in

progress or failure.

The range of ROM that includes the

BIOS is checksummed. Failure will result

in a system halt.

1-2-1

04h

Programmable interval timer

0 test in progress or failure.

Over a period of time, the current count

values in timer 0 are read and

accumulated by ORing them into the

values read so far. It is expected that

during the time period, all bits will be set.

Failure will result in a system halt.

1-2-2

05h

DMA channel 0 address and

count register test in progress

or failure.

Rolling ones and rolling zeros test of the

address and count registers of DMA

channel 0. Failure will result in a system

halt.

1-2-3

06h

DMA page register write/read

test in progress of failure.

Pattern test of DMA page registers.

Failure will result in a system halt.

1-3-1

08h

RAM refresh verification test

in progress or failure.

Over a period of time, the refresh bit (bit

4) in port 60h is read and tested. The

refresh bit should toggle from 0 to 1, then

1 to 0 within the time period. Failure will

result in system halt.

none

09h

First 64K RAM test in

progress.

No specific test is performed - just

indicates that the test is beginning.

1-3-3

0Ah

First 64K RAM chip or data

line failure, multi-bit.

The first 64K of RAM is tested with a

rolling ones test and a pattern test. If any

of the pattern tests fail, then the BIOS

reports that multiple data bits failure.

Failure results in a system halt.

FIC A440 Series Service Manual

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