Could water damaged lcd cause phone to shut down/reboot?

I ran my phone threw the wash 2 days ago. The washing machine broke mid cycle so it sat in a good 3' of soapy water for 12 hours and then sat full of the water after i got it out because i had to go to work. I pulled it all apart and cleaned the main board as best as i could. I used a electric toothbrush and 99% alcohol to remove all the soap residue and corrosion. I could not get under the heat sinks so let it soak in 99% for about 20 mins. I cleaned the cameras as well. I tested the battery with a multi meter and it read 3.8V so i guess its okay. I put it all back together and turned it on. It started up like normal and was working fine, cameras and all. The screen was full of water and the touch was hit or miss so i thought it just needed a new screen. Then it started a reboot loop after about 10mins. After the 3rd reboot it went black. I could feel the main board getting warm inside so I pulled it all apart again to disconnect the battery. Could the screen cause these symptoms or do i have bigger problems?

Is i passable the screen died completely causing it to get stuck in a boot sequence waiting for a response from the screen module and causing all the extra heat? Or did the main board $@$* the bed?