This is one of the most common headaches for owners of the A1278 (typically the 13-inch Unibody models from 2009–2012). The good news? It’s a software issue, not a hardware failure. The bad news? Apple doesn't make it obvious how to fix it.
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A very common issue with the A1278 on Windows is a glowing red light in the headphone jack and zero internal speaker audio. This is one of the most common headaches
For the Apple MacBook Pro A1278 running Windows 10, the generic Microsoft driver delivers substandard audio. By installing the driver from Boot Camp Support Software and applying the registry and format optimizations described above, users can achieve high-quality audio with full dynamic range, proper headphone switching, and 192 kHz/24-bit playback capability. The bad news