Game Boy:General Troubleshooting
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Cannot Play on Battery Power
If you are unable to play on battery power, your DC jack may have failed. The DC jack detects if something is inserted and will turn off the battery circuit if it detects something. These jacks are known to fail and keep the battery circuit shut off, even if something is not inserted. You can try to spray metal contact cleaner into the jack or replace the jack.
Battery Draining Faster
Clean the power switch.
Audio Issues
Clean the power switch.
Clean the headphone jack using pipe cleaner and IPA.