5126 Backlight flickering

nottomhanks

Tinkerer
Oct 31, 2021
119
51
28
Hey everyone!
A few years back I had someone repair my backlit portable and it works great.
Recently though, the display backlight starts flickering whenever there’s disk access happening, even with BlueSCSI, which uses less power.
The question is, is there a backlight voltage regulator that needs help, and does that live on the display board, or the logic board?
Would like to get this happy again, as I have the MacEffects 8mb ram card, @Androda ’s battery replacement module, as well as BlueSCSI 2 working really well.
Please help!
 

SuperSVGA

Tinkerer
Mar 26, 2022
64
34
18
Does it happen when less than 5MB of RAM is installed? Sometimes the mapper register ends up putting the backlight in the RAM area.