Fixing a Sega Genesis With Bad Video - Retro Console Restoration

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I've featured a few Sega Genesis Model 2's on the channel previously, but when I was contacted about the issue with this particular system I was intrigued. It has a very strange problem with its graphics, and one that I found close to no information about anywhere else.
I decided to take on the challenge and accepted this donation, figuring it would be a unique repair and a good learning exercise. The previous owner informed me that the symptoms of this console only appeared after a recap attempt with a kit that they had purchased from Console5.
Enjoy watching the repair journey with this one, and hope you learn something along the way!
My philosophy on buying tools is to start small and to "outgrow" your gear over time. Expensive gear won't improve your repair and fault finding skills, only practice will do that. With that in mind below is what's in my current toolkit.
🔧 Toolkit
Screwdriver Set: amzn.to/2X7s0Gj
Automatic Wire Stripper: amzn.to/30F5TJm
Pocket Multimeter: amzn.to/3IdvzQz
Component Tester: amzn.to/3l5rHG8
🖌 Soldering Essentials
TS100 Soldering Iron: amzn.to/2YIJZUR
No Clean Flux Syringe: amzn.to/2NFUZvQ
No Clean Solder: amzn.to/2NHEAqQ
Desoldering Braid: amzn.to/312Grws
Tip Tinner: amzn.to/31w2EF4
Contact Cleaner: amzn.to/3dI93ly
🔍 Soldering Add-ons
Fume Extractor with Hose: amzn.to/3hspLZi
Desoldering Vacuum Pump: amzn.to/3JdWex9
Circuit Board Holder: amzn.to/3k35Pzm
Helping Hands Soldering Aid: amzn.to/3ihgksP
🔥 Thermal Compounds & Tape
Kapton Tape amzn.to/3DEu0dd
Arctic MX-4 Thermal Paste: amzn.to/2Ak2y8w
1.5MM Arctic Thermal Pads: amzn.to/2Vv1RQU
🧴 Lubes and Epoxies
White Lithium Grease: amzn.to/2UApx5M
Plastic Epoxy: amzn.to/3up0LIm