I have a ZX Spectrum+ and it didn't came with it original power supply.
I bought a 9 Volts and 2.25 Amps power supply with switchable connectors.
There was a mistake and the polarity was inverted, the barrel connector had positive in the center, but from what I read, it must be negative in the center.
I checked the ZX Spectrum+'s mainboard and nothing looks in bad shape, even after the polarity was reversed.
The problem is that it didn't boot before and it still doesn't boot with the negative in the center. What happens in both cases is that the internal regulator starts to heat really quickly (I read that it was normal for it to get hot) and nothing shows up on screen (I user a SCART interface).
Could the ZX Spectrum+ have been damaged by the reversed polarity, if yes, what components could have been damaged, and how can I fix it?