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Recap power board , sound and gamegear , pretty much always fixes done so many now . You can test it with no caps on gamegear at all if power board and soundboard are ok as you will get red light boot and soundI've rediscovered my old Game Gear from a garage tidy up at the weekend, when powering on the screen comes on for a second and then it goes dead. Reading online this might be something terminal with the capacitors? Anyone have any ideas please?