I'm using cleanamp, funny playing ips lcd v2, and mcwill recharge mod. No hissing whatsoever now. I also replaced the other two caps with smd mlcc equivalents as well, but the extra capacitance here is probably the real fix.
As I said in the title, if you are installing a backlit TFT or IPS display into your gameboy color, you need this to reduce the noise!
680UF Aluminum Capacitor for CleanAmp | 20% 6.3V SMD
After mounting the funny playing IPS screen a horrible noise was generated, after changing the capacitor the sound is totally clean.
Not strong enough for the rechargeable battery mod. It could also be that the GBC needs to be re-capped but I used a generic USB-C charge board and there is significant hum that's still there. It drastically reduced the hum, but the hum is still there with the USB-C charge board. https://www.amazon.com/Lithium-Battery-Charging-Protection-Functions/dp/B07MDPLQ18 for reference.
Removed the hum I was getting while changing TFT brightness with an aftermarket speaker. Watch a video on replacing surface mount capacitors and make sure you are comfortable doing it before you order. Its not complicated, but the small size makes it a challenge if you have shaky hands like me.