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This could be a bad U7000, bad SMC, corrosion on BIL connector, bad BIL or corrosion under battery connector, first remove BIL and inspect connectors (battery and BIL)-----replace U7000----replace SMC
Is BIL working properly?? Are you taking the SMC from a identical board?? Resistance between pins 17/18 and 27/28 from ISL6259?? Seems to be a bad SMC..
Hello Paul, try this one, it does not have a clean ME region, but it should at lesat chime and show video..
If it work i can help you to set a clean ME region and the correct serial number...
https://www.4shared.com/rar/lFV6Qyw8fi/820-3023-A_BIOS.html?