It might be the display inverter, the iBook has quite a few years life and inverters may deteriorate with time. Since you have parts around it would be a zero cost try. You can get some help from this guide:
[guide|4236]
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=== Update (09/28/2018) ===
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@oldturkey03 Here are the bottom of the logic board and top pics with detail of what I mistakenly took for the Pram battery. Hope that helps, if not just ask for more
It might be the display inverter, the iBook has quite a few years life and inverters may deteriorate with time. Since you have parts around it would be a zero cost try. You can get some help from this guide:
[guide|4236]