· First off don’t ultrasonic the board again.
· The Ammeter is only useful if you want to know if it’s charging.
· You originally had a communications problem now you have a power problem as well.
· Start measuring all your important power rails
· What is the dcps showing on prompt to boot?
If this is a customer’s data recovery job I would stop there. Data is too precious to mess with. If you don’t have the experience yet I would outsource it to someone that has.