A1932 (820-01521) – Internal Display Not Detected After Sleep

Hi all,

I’m troubleshooting a MacBook Air A1932 (2018, EMC 3184) that suffered water damage. I’ve done extensive testing and want to get some expert opinions before proceeding with repairs.

Behaviour:

1. Internal display works on cold boot, but after closing the lid and reopening:
   • Keyboard lights come on, sound works
   • Screen remains completely black
   • Flashlight test shows nothing on display
2. External display tests:
   • Using a USB-C hub to pass power + HDMI → external video does NOT work
   • Removing power from the hub → HDMI video works normally (without sound passing)
   • After closing the lid, the external display continues to work while the internal display never comes back

Fixes:

• From the water damage and inspection to the original components, I already replaced the audio board (due to signs of corrosion), which fixed the not-booting problem resulting from the spill.
• Now, with these "new" problems, I'm thinking of buying a replacement A1932 logic board (820-01521) with a matching Touch ID/power button.

Am I correct in thinking this is the way forward, or are there any other tests I can do? Maybe other parts that I should replace first?

Thanks