Hi Lxle community

I've a laptop  which i need to adjust the time before the monitor screen goes to black. I might be being stupid but I can't find a setting to adjust the monitor timeout - I've looked through all the tlp documentation but can't find any settings - I've uninstall i3lock and disabled xautolock but the laptop still fades to black.

Does anyone have any Suggestions where to start

Thanks 

Andy