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If it helps, the PS model number is 7501. Do you think it was the incorrect voltage that caused the problem? Do I need exactly 3.5v for the middle pin?

So I'm a total electronics noob, but got a portable DVD player with an unworking lens for free and thought I'd try to portable-ize my original playstation.

I got the step down regulator from Texas Instruments. However, the local radioshack didn't have the recommended 1.8k or 2k resistors, only 1 ...