Atari 5200 Controller Test and Repair Attempt

Links:

My Equipment:

Video:
Camera:Canon Vixia HF R800 1080p
OBS Studio for Recording and Live Streaming on my Custom Built PC
Capture Cards:Elgato Cam Link, Elgato HD60 Pro, Elgato HD60 S+

Audio
Mixer:Behringer X1832USB
Microphone: Audio-Technica ATW-R2100bi

Main Monitor:ViewSonic VA2756-MHD
Secondary Monitor:Asus VE278Q
Computers:

My Editing Computer:Apple M1 Mac Mini (2020)
16GB Ram
10G Ethernet Card
2 TB SSD

My Custom Build:
Corsair 200r Case
Corsair RMX 750X PSU
Gigabyte Z370p D3 Motherboard
Intel i5-8500 CPU
8GB of Ram
1 TB WD Black HDD
240GB ADATA SSD
EVGA Geforce 1650 XC Black Gaming 4 GB

Test PC Build (Custom, Built in 2020, Rebuilt with changes in 2021)
Case:Corsair 200r
PSU: Corsair CX450M
MB: Gigabyte B365M-DS3H
CPU: Intel Celeron G4920
Ram: Corsair Vengeance 1x8GB
SSD:Adata 240gb
DVD Drive:LG ??