Question about Panasonic Toughbook 28 Notebook

1 Answer

Toughbook LCD is Dark.

I have a CF-28 Toughbook (1) and today the LCD went dark. I tested the LCD on another CF-28 (2) and the LCD works perfectly on it. I also checked the second Toughbooks LCD screen on the First on and it also was dark. To summarize; Both LCD screens work on Toughbook 2 but niether work on Toughbook 1. I can see and image on Toughbook 1 but I need to shine a light on it to do so.

Any ideas?

Thank you.

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  • Panasonic Expert
  • 112 Answers

On all Panasonic Toughbooks, any model pre-2008/2009 would have the older LCD screen with an "inverter". The new screens are called LED because there is no inverter.
The inverter is like the "ballast" on a fluorescent tube lighting fixture. The tube could be good but if the ballast is blown then the tube will not "light-up". This is also true of the inverter.
You can also tell when the inverter is about to burn-out when you first start your toughbook in the morning and the screen is initially "red" and then turns white after the unit warms-up for a few minutes.
Good Luck to you.
Regards from Richard, Montreal Based Panasonic Canada Authorized Toughbook Dealer since 1989.

Posted on Nov 02, 2017

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SOURCE: keyboard installation for CF-52 toughbook

Here you , this is a step by step disassembly guide with pictures

Its for a Toughbook CF-50 but it should be similar as theres not too much difference in the model number

http://www.machinaelectronics.com/store/library/article.cfm?f=key_type_k17

Posted on Jan 04, 2009

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SOURCE: My panasonic toughbook cf 28 memory issue

i'm not sure what your configuration was in the computer before you tried installing the extra memory, but here's some common problems i see.

-it might exceed the maximum amount of memory that can be recognized in each slot or total for the computer

-it might have be installed in matching pairs (if it is a 2 memory slot machine which most are).

-it might not take that exact speed/rating

hope that helps

Posted on Jan 16, 2009

Geekman
  • 32281 Answers

SOURCE: Color Display on Panasonic Toughbook CF-28 is dull

You most likely have a defective screen - a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :-
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display or appear black.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

Posted on Jun 02, 2009

1alexh
  • 484 Answers

SOURCE: upgrade hard drive in panasonic toughbook cf-50

1 - Using a stack of DVD RW blank disks, or a large capacity USB Flash/Jump Drive, back up your Laptop computer completely. If necessary, Use WinZIP to ensue that everything has been compressed into the smallest capacity possible.
2 - When you are certain that you have backed up the drive completely, remove the older drive
3 - Line up the new drive and the old drive and ensure the jumpers are set to the same settings as they were set on the older HDD.
4 - Once you are sure, you then restore everything from the back-up drive for the old hdd to the new disk drive.
5 - Test to ensure that everything from the old drive has been backed up from the old drive to the new drive.
6 - If you are comfortable that your backup has been completly restored from the backup meda to the new, larger hard drive, then be certain that you have restored from the older drive to the new drive, tighten all screws and cables, then close all ports and ensure that everything has been done properly by and for you.
7 - Be certain that you have created the same user accounts in the new drive as you had on the older drive.
8 - Now, power off the new drive while in the laptop. Wait about 30 seconds to one minute, then restart the new hard disk drive.
9 Test everything, to be sure that everything works properly. Go through everything from the top of the menu to the bottom of the menu. Try all accessories, try all applications. Ensure that all works right and that the applications work as they used to work, when it was on the old drive.
10 - Remember, you have a warranty on the new HDD, so be sure that you have tested everything to ensure that it all works properly, before you sign off on this new drive.
11 - Once you are certain that it all works correctly, you can then be sure that it is working properly and competely, because only you know if things are working correctly as they should be.
12 - Then you can sign off and you can be sure that things work properly.
13 - As carpenters say ... measure twice; cut once. You can only do this one time, so if you measure it more than one tim, you can be certain that you will get it done correctly and be happy that you did it right. from beginning to end.
Have fun. Don't be too serious about it, but do be careful, and get it right. Remember, get it right the first time, and you will be pleased with the results at the end.

Posted on Jun 22, 2009

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Hi

Thank you for your query

The problem you are experiencing is a fairly common problem with laptops, it would seem that if plugging the charger back in doesnt make any difference then the screen inverter will need to be replaced

Please plug in the charger to see if this makes any difference and if not you will need to book the toughbook in for replacement of the inverter


If this has been useful please leave postive feedback/vote/testimonial - Thank You Again - shauqatm@yahoo.co.uk

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Color Display on Panasonic Toughbook CF-28 is dull


You most likely have a defective screen - a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :-
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display or appear black.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

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Have a CF-28


The last three letters of that model number are unnecessary.
CF-28P3JP8QM has the following desription:
PIII 800MHz, 256, 30GB, 13.3"NON-TOUCH, FDD, 56k/LAN, CISCO WIRELESS LAN, PALM ANT, NO 56K, XP/2K
You can look up this info for yourself at
http://config.toughbook.com/
You will need to use Internet Explorer as other browsers don't seem to work on that site.

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My panasonic toughbook cf 28 memory issue


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-it might exceed the maximum amount of memory that can be recognized in each slot or total for the computer

-it might have be installed in matching pairs (if it is a 2 memory slot machine which most are).

-it might not take that exact speed/rating

hope that helps

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