Panasonic CF-Y5LWVYZBM Service Manual ▷ View online
13
4 Diagnosis Procedure
4.1. Basic Procedures
14
4.2. Troubleshooting
Please take note of the following two points with regard to troubleshooting:
1. Know-how of diagnosis upon occurrence of heavy troubles, e.g. Set cannot be turned ON , Set fails to start , No display on
screen , etc.
2. Explanation of each trouble, mainly symptom of trouble in operation.
Flow Chart
NG
NO
YES
NO
YES
NG
NO
YES
NG
OK
OK
NO
YES
NG
OK
NG
OK
NO
YES
OK
OK
NG
START
START
Pay attention to the following points when in pursuit of the cause of a troubleshooting.
1. Peripheral apparatus connected with the set should all be removed before operation check.
2. Make sure that cables, boards, etc. are not coming off, and recheck the contact condition.
1. Peripheral apparatus connected with the set should all be removed before operation check.
2. Make sure that cables, boards, etc. are not coming off, and recheck the contact condition.
Set cannot be supplied with current.
Power lamp fails to light up.
Power lamp fails to light up.
AC
Adaptor/Battery
Output voltage
Replace AC Adaptor/Battery
Return set-up utility setpoint to the state of delivery from factory .
Make sure of contact of K/B connector in use.
Replace keyboard or main board.
Replace keyboard or main board.
Replace DVD drive.
Replace main board.
Replace main board.
Reinstall HDD.
Replace main board.
Replace main board.
Power lamp
check
Check contact condition of power input terminal. Replace if
defective.
Check Power SW. Replace if defective.
defective.
Check Power SW. Replace if defective.
Inverter board
Replace inverter board.
Check inverter cable continuity. Replace if defective
Check inverter cable continuity. Replace if defective
Replace LCD back light.
BIOS operation
check
Replace main board (Check fuse at power source).
LCD unit
check
Replace LCD unit.
Result of
POST
Refer to POST
error code table.
error code table.
Replace main board.
Main board
check
Replace main board
HDD access
Check HDD cable connection and continuity.
Replace if defective.
Replace HDD & Reinstall.
Replace main board.
Replace if defective.
Replace HDD & Reinstall.
Replace main board.
Set-up utility
starting
Replace main board.
Trouble
symptoms on some
of DVD or CD
Check if there are any flaws on DVD or CD
media. Since flaws may appear on specific
media, DVD or CD media can be defective.
media. Since flaws may appear on specific
media, DVD or CD media can be defective.
START
END
Dark display on screen.
Screen fails to display.
Screen fails to display.
Failure in starting
Not displayed properly on screen.
Some or all keys cannot be input.
DVD/CD CALL not practicable.
Starts but operates unstably.
Heavy trouble e.g.,
Set cannot be turned
ON , Set fails to start ,
No display on
screen , etc.
Each kind of
trouble in
operation.
trouble in
operation.
*Clean DVD-ROM drive with an applicator.
LCD back
light lighting
15
5 Power-On Self Test (Boot Check)
Outline of POST
The set has a boot check function called POST (Power-On Self Test) in it.
The condition of the main body is diagnosed by checking beep sound or error code.
Start .............Test begins automatically when power switch is set to ON.
Normal finish .....After memory checking, a beep sound is issued once and the set is placed into automatic stop.
Normal finish .....After memory checking, a beep sound is issued once and the set is placed into automatic stop.
Note: If no error occurs, nothing is displayed. (No display of OK, etc.)
Error Diagnosis by Checking Beep Signal Sound
The beep sound is as follows:
= long sound (about 0.4 sec.), = short sound (about 0.2 sec.), Length between sounds is about 0.1 sec.
Table of errors classified by beep sounds
(1 (long sound) -2-3-4)
(Length of bar shows length of sound.)
Diagnosis
Beep signal sound
Error message
1(long sound)-2
BIOS ROM error
BIOS ROM error
RAM error
Keyboard controller error
RAM error
RAM error
RAM error
1-2-2-3
1-3-1-1
1-3-1-3
1-3-4-1
1-3-4-3
1-4-1-1
BIOS ROM error
2-1-2-3
Occurrence of unexpected offering
2-2-3-1
Main board
(Note) A beep sound is also issued in case of other I/O trouble.
16
6 List of Error Codes
<Only when the port replicator is connected>
The following is a list of the messages that BIOS can display. Most of them occur during
POST. Some of them display information about a hardware device, e.g., the amount of memory
installed. Others may indicate a problem with a device, such as the way it has been configured.
Following the list are explanations of the messages and remedies for reported problems.
If your system displays one of except the messages marked below with an asterisk (*), write
down the message and contact Panasonic Technical Support. If your system fails after you
make changes in the Setup menus, reset the computer, enter Setup and install Setup defaults
or correct the error.
POST. Some of them display information about a hardware device, e.g., the amount of memory
installed. Others may indicate a problem with a device, such as the way it has been configured.
Following the list are explanations of the messages and remedies for reported problems.
If your system displays one of except the messages marked below with an asterisk (*), write
down the message and contact Panasonic Technical Support. If your system fails after you
make changes in the Setup menus, reset the computer, enter Setup and install Setup defaults
or correct the error.
0200 Failure Fixed Disk
Fixed disk in not working or not configured properly. Check to see if fixed disk is attached
properly. Run Setup. Find out if the fixed-disk type is correctly identified.
properly. Run Setup. Find out if the fixed-disk type is correctly identified.
0210 Stuck key
Stuck key on keyboard.
0211 Keyboard error
Keyboard not working.
0212 Keyboard Controller Failed
Keyboard controller failed test. May require replacing keyboard controller.
0213 Keyboard locked - Unlock key switch
Unlock the system to proceed.
0230 System RAM Failed at offset :
nnnn
System RAM failed at offset
nnnn of in the 64k block at which the error was detected.
0231 Shadow RAM Failed at offset :
nnnn
Shadow RAM failed at offset
nnnn of the 64k block at which the error was detected.
0232 Extended RAM Failed at offset :
nnnn
Extended memory not working or not configured properly at offset
nnnn.
0250 System battery is dead - Replace and run SETUP
The CMOS clock battery indicator shows the battery is dead. Replace the battery and run Setup
to reconfigure the system.
to reconfigure the system.
*0251 System CMOS checksum bad - Default configuration used
System CMOS has been corrupted or modified incorrectly, perhaps by an application program
that changes data stored in CMOS. The BIOS installed Default SETUP Values. If you do not
want these values, enter Setup and enter your own values. If the error persists, check the system
battery or contact Panasonic Technical Support.
that changes data stored in CMOS. The BIOS installed Default SETUP Values. If you do not
want these values, enter Setup and enter your own values. If the error persists, check the system
battery or contact Panasonic Technical Support.
0260 System timer error
The timer test failed. Requires repair of system board.
0270 Real time clock error
Real-time clock fails BIOS test. May require board repair.
*0280 Previous boot incomplete - Default configuration used
Previous POST did not complete successfully. POST loads default values and offers to run
Setup. If the failure was caused by incorrect values and they are not corrected, the next boot
will likely fail. On systems with control of wait states, improper Setup settings can also termi-
nate POST and cause this error on the next boot. Run Setup and verify that the wait-state
configuration is correct. This error is cleared the next time the system is booted.
Setup. If the failure was caused by incorrect values and they are not corrected, the next boot
will likely fail. On systems with control of wait states, improper Setup settings can also termi-
nate POST and cause this error on the next boot. Run Setup and verify that the wait-state
configuration is correct. This error is cleared the next time the system is booted.
0281 Memory Size found by POST differed from EISA CMOS
Memory size found by POST differed from EISA CMOS.
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