Apple Service Diagnostics - 3s155 [2021]

If you do not have microsoldering tools, replacing the entire logic board costs $400–$800. Replacing the USB-C port board (on MacBooks that have separate port daughterboards, like the A1708) costs $30–$50 but is easy with a screwdriver.

Based on internal service guides leaked over the years (and verified by third-party repair shops like Louis Rossmann’s group and iPad Rehab), specifically relates to: Apple Service Diagnostics - 3S155

Let’s break down the anatomy of .

This diagnostic suite typically consists of two distinct components, often distributed as separate bootable partitions or images: If you do not have microsoldering tools, replacing