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After replacing an audio cap and a video cap, my Game Gear's audio and video are back, but now there's a new issue. Occasionally, I'll turn the system on, the screen and power light will come on for a second, and then turn off. If I let the system sit for a few minutes, It will work just fine.
The game gear internal power supply unit has a soft circuit breaker protection.
Something is tripping it. It could be the you need a full recap. But I also experimented similar issue that was caused by a bad connection in the grey wires that connect the boards together.
What did you do? Just reseat the connectors?
Edit: That appears to have fixed it. I'll write back if I have any further issues, but until then, you're a Game Gear fixing wizard!