Does Apple Hardware Test cover the Logic Board

Hello,
I was wondering whether the Apple Hardware Test tests the Logic Board. Would I have to do a extensive scan? The reason I am asking is because I am having a possible issue with the sound chip and the Apple Store told me to go home and do a Hardware Test, but never said if the Logic Board is actually covered in testing. Thanks.

My understanding with the extended test is that it's run time will be based largely off how much RAM your system has. I always used the rule of thumb that it was 25-40 minutes per GB of RAM. I once ran an extended test on a Mac Pro system with 12GB of RAM that took almost 9 hours to run.
The AHT test is not designed to detect any/all hardware issues, even the extended test. Apple Service Providers (Retail Stores as well) have another software-based diagnostic tool that they run, which I believe to be superior to AHT in terms of detecting some issues (not all). Sometimes for specific issues with components on the logic board, there isn't a software test that's going to pick up the issue and you may need to go by what's occurring in the OS.

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