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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. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.   

Set cannot be supplied with current. 
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 DVD drive. 
Replace main board.

Reinstall HDD. 
Replace main board. 

Power lamp 

check

Check contact condition of power input terminal. Replace if
defective. 
Check Power SW. Replace if defective. 

Inverter board

Replace inverter board. 
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.

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. 

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. 

START 

END 

Dark display on screen. 
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. 

*Clean DVD-ROM drive with an applicator. 

LCD back 

light lighting

15

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.

Note: If no error occurs, nothing is displayed.  (No display of OK, etc.)

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

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.

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.

Stuck key on keyboard.

Keyboard not working.

Keyboard controller failed test.  May require replacing keyboard controller.

Unlock the system to proceed.

System RAM failed at offset 

nnnn of in the 64k block at which the error was detected.

Shadow RAM failed at offset 

nnnn of the 64k block at which the error was detected.

Extended memory not working or not configured properly at offset 

nnnn.

The CMOS clock battery indicator shows the battery is dead.  Replace the battery and run Setup
to reconfigure the system.

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.

The timer test failed.  Requires repair of system board.

Real-time clock fails BIOS test.  May require board repair.

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.

Memory size found by POST differed from EISA CMOS.