This kind of ballasts are considered disposable... you might luck out and get one that lasts years, and you might get one that dies like yours. I would not try to repair it... not worth the risk to cause a fire and lose fixture, tank and house.
You could buy a similar throw away fixture (commodityaxis.com has them, maybe your LFS for a few bux more) and switch the ballasts.
Or, if you are electrically able, buy a cheap electronic ballast at HD and wire it to the bulb remotely (maybe back of the fixture).
Does your fixture have a reflector, or is the black back the "reflector"? Adding a decent reflector can double the light that makes it into your tank.
You could buy a similar throw away fixture (commodityaxis.com has them, maybe your LFS for a few bux more) and switch the ballasts.
Or, if you are electrically able, buy a cheap electronic ballast at HD and wire it to the bulb remotely (maybe back of the fixture).
Does your fixture have a reflector, or is the black back the "reflector"? Adding a decent reflector can double the light that makes it into your tank.