Question Laptop display backlight persist after shutdown and drawns battery

[deim31]

Hi, I have laptop (Acer TravelMate B-115M) and it's display works well but when I shutdown the laptop (all leds goes off) display switches to dark with visible backlight coming from corner of screen.
It drawns battery. What could cause this? I didn't found anything but questions on web.

 

[Lutfij]

You could try and see if the laptop is pending any BIOS updates. Use your laptop's serial number on Acer's support site to bring up a page for your laptop in question.

 

[deim31]

Have v1.40, latest is v1.40:
https://www.acer.com/cz-cs/support?filter=global_download&search=TMB115-M#BIOS/Firmware
Do you think reflash could help?