Depends on the console a SNES for sure needs retrobrite the plastic grows brittle and literally falls apart same with the NES. A White Dreamcast also needs retrobrite if I remember right the TG16 needs new capacitors it suffers the same issue as the Game Gear. Most of the old handhelds need new screens since they fail with age my Game Gear had new capacitors put in and a McWill mod done to it. The NES needs the lock out chip disabled when the power light turns on and off maybe throw in a new 72pin as well. Sega Master System has an issue blowing out the 7805 voltage regulator. OG Xbox depending on the board revision needs a clock capacitor removed or it leaks and fries the board. N64 controller needs a new thumbstick Sega Genesis model 2 suffers from the solder around the power supply is prone to cracking hence the system will not power up. Sega CD model 1 the laser dies fast model 2 the rubber feet supporting the drive fail and the model is know to throw the pico fuse so it dies fast as well.
It also depends how you treat the system also I baby my shit. I don’t throw it around like a football the systems I see that might need the most help going through the years are the ones that use lasers and discs. I know some systems have problems due to how they were built as well like again certain board revisions of an OG Xbox and the Game Gear. I have bought broken systems and picked them for parts. I actually enjoy fixing older systems it’s relaxing and a great way to teach yourself new skills.
