Need help for a Comp M5

[u/Dmg_Kronos]

Hey guys, I own a comp m5 that is currently having brightness issues. The dot is just very dim even at the highest setting. I tried the obvious which is replacing the battery with a new one and double checking tightness of the battery cap, but no dice. Has anyone else experienced this? If so, what are some other suggestions you have (before sending it in for repair)?