Master System:General Troubleshooting

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If your Master System is having issues, check the below general troubleshooting information for help.

No Power LED

Open the console and check the voltage regulator underneath the metal heatsink with a multimeter. One leg should be ground, one leg should be around 9V, and another leg should be 5V.

  • If no leg has around 9V, check your power supply and maybe try a different one.
  • If no leg has around 5V, replaces the voltage regulator with a new 7805 voltage regulator.

Black Screen

Open the console and remove the top and bottom RF shielding. Plug the console in and see if it works properly. If it does, likely the issue is that the RF shielding is slightly bent and touching the expansion port, shorting out the pads. Either bend the RF shield away or cover the expansion port pads with electrical tape. This port was never used by official accessories, but aftermarket accessories may be used in that port such as the expansion port BackBit cartridge variant.

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