Basic 400 Bi-Amp Active Speaker Repair - No Tweeter Output, Finally FIXED!

A Customer brought me a Basic 400 Bi-Amp from an Active Speaker. It is faulty but I need to find out which component is causing the problem.

Follow this repair:
Part 1
   • How To Diagnose IC Faults : Is It The Chip...  
Part 2
   • Is The IC Faulty Or Is It Something Else P...  
Part 3
   • How To Measure Current Flow On A PCB : Bas...  
Part 4
   • Where Did The Current Flow Part 2 : Basic ...  

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Thank you
Richard