Hi
From what I have read you wrapped the phone in tissue before putting it in rice.
After finding the water drops did you warp the parts separately before ricing them > battery etc.
Although you mitigated contact with rice it’s easy for dust to get to the phone and with water form glue which can coat and tarnish contacts etc.
One problem with this is that there’s an assumption of drying and then of course replacing the battery is risky.
Another problem with wrapping and rice is that the moisture is being transferred to the adjacent medium and will stay there. In an air flow the moisture is being atmospherised.
OK
The screens failure can be down to poor contacts during re-assembly.
- So dismantle and dry in a flow air for 12 hours
- Clean the contacts as best you can before re-assemble. You will find Isopropyl Alcohol is the common cleaning fluid
- Check this post to see the moisture indicators
- Check this post to see an activated moisture indicator
- Check this to disassemble the bottom module to clean the USB more efficiently.