I never repair a Game Gear before, but there's a recommended guide here:
http://members.optusnet.com.au/eviltim/ggrgb/ggrepair.htmlAccording to SMSPower's Maxim most of the time GG problem, it need to replace some capacitors inside the console.
The symptoms of faulty capacitors include:
- LCD Screen only looks good when viewed at an unnatural angle (anything other than 90 degrees).
- Bright parts of the picture create 'ghost lines' in the dark parts.
- Screen looks washed out, dim, and lacking in contrast.
- Turns itself off (in extreme cases).
- Very quiet or no sound from the speaker
- Problems may be alleviated when unit has warmed up a bit.
- Screen flashes/flickers rapidly