The backlight works for a second or 2 when i press the Fn and F5 keys, the image is on the screen when i shine a torch on it
If you can see the images on the screen very faintly when you shine a flashlight on the screen, then your problem more than likely is the LCD Inverter. The LCD Inverter costs less than $10, but you will have to disassemble the lcd screen to get to it.
I'm sure you know that you can attach an external monitor to your laptop and hit the FN key and hold it while you hit the correct F1 thru F8 key that will display the image on the external monitor? This could be a solution until you get the inverter fixed.
Now a dishonest repairman will take advantage of you if you take that laptop to them talking about the backlight is going bad. He'll simply bill you $300 and tell you he had to replace the LCD Screen which houses the back light an most times it's easier to replace the screen then fool with the backlight. And in your case all he would do is replace the lcd inverter that sits under the lcd screen and is covered by the strip at the bottom that goes around the lcd screen.
SOURCE: acer travelmate 4200 'F5' key not working
there is a seting somewheres that turns on and off your fn key. sorry I dont know where at this point but when i do i will reapply
I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102
SOURCE: Acer Travelmate 8100 when pressing fn and f5 nothing happens
I found the problem. The drivers needed for the keyboard are:
Windows\system32\DkbFltr.sys
provided by Dritek System Inc. Version 1.3.00
Windows\system32\8042prt.sys
Windows\system32\kbdclass.sys
I looked at the current drivers for the keyboard. Somehow the keyboard must have been reinstalled or drivers got corrupted. I did a system restore to a time before I installed some new hardware and drivers. Then I looked at the drivers for the keyboard through the control paned =>
keyboard =>
hardware Tab =>
Standard keyboard =>
properties =>
Driver Tab =>
driver details.
And found that the drivers were different except for the last one in the above list
You can update the drivers. Do a search for the first one in the list and the second one in your windows directory(search for hidden files and system files). I found the files in my system32/drivers directory. You may also find it on the disks that came with the Acer.
I have looked on-line for the first one and could not find it. perhaps a better search term swould find it. I also looked on Ace rs site.
Good luck,
Wybmasiity
SOURCE: fn f5 not working and volume bars not showing when
Acer management software not loaded. Doa system restore to a day before the problem started. If still no good, alt+F10 at boot time to restore it to factory condition. Back up important files first, as this will wipe the c: drive....
let me know if this works or not.
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