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PSU on Oregon Scientific HMS388 Hi-Fi went US. Noisy hum. ecee and one of the PSU pol caps was soldered in the wrong way round and had exploded. replaced it but PSU won't start up past a quick burst of initial power. Do you have schematic or idea how to find out how switched mode PSU works?

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Were the inverters separate from the power supply? If so, the power supply may be a fault. Most TV's and Monitors suffer from Bad Capacitors, which can be identified due to them "swelling", the tops become rounded instead of flat. When this happens, the capacitor has failed, and can cause the hum, due to more ripple in the power out from the PSU. Also check you reattached the earth cable, if you had to remove it when replacing the board. Many are clamped to the metalwork with a screw.

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