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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I would say that you have a shorted component or board, that would explain the shutdown and failure to sustain voltages.
Check whether the component E994 might be open - a service bulletin was issued on that for this model.
Or try obtaining a service manual:
for a paper service manual copy, or
for a downloadable copy.
Those manuals ought to save you a considerable amount in components bought and tried for the problem. Their troubleshooting table should direct what the problem is and what to test for in some detail.