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View topic - [HELP] Sega master system 2 won't power on

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  • Joined: 11 Jan 2023
  • Posts: 3
  • Location: Greece
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[HELP] Sega master system 2 won't power on
Post Posted: Wed Jan 11, 2023 2:04 pm
My uncle gave me two SEGA MASTER SYSTEMS 2.
Both of them won't power on or show any signal. Is there any way to diagnose the problem? Thanks

[EDIT] I realised that if I remove the power thingy's coller, it gets hot, wich means that tghe system is not 100% dead. Or I think so
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  • Joined: 14 Aug 2000
  • Posts: 740
  • Location: Adelaide, Australia
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[HELP] Sega master system 2 won't power on
Post Posted: Thu Jan 12, 2023 1:07 am
Yes there are ways to diagnose the Master System II.

A good starting point is to confirm that the external power supply and TV are good before diving into the Master System console itself.

Do you have a multimeter to confirm that the power supply is providing 9 Volts DC?

For the TV, how are you connecting the Master System to it and have you tuned in the signal?
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  • Joined: 11 Jan 2023
  • Posts: 3
  • Location: Greece
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Post Posted: Thu Jan 12, 2023 11:47 am
sadly no, I don't have a multimeter. I am going to get one soon. will a prety cheap model be ok since I dont want 100% accuracy? Also I have tried 3 TVs and they all support analog signal. I don't use the original sega power supply because mine is broken, so I use another 220V AC to 9V DC
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  • Joined: 05 Sep 2013
  • Posts: 3758
  • Location: Stockholm, Sweden
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Post Posted: Fri Jan 13, 2023 4:15 pm
staAR1net wrote
I don't use the original sega power supply because mine is broken, so I use another 220V AC to 9V DC


Check the power supply polarity, correct one is indicated on the SMS near the DC IN socket.
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  • Joined: 11 Jan 2023
  • Posts: 3
  • Location: Greece
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Post Posted: Fri Jan 13, 2023 4:58 pm
So I went out and bought some new voltage regulators because I think mine are broken (I will get a multimeter soon so I can test them)
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