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When you use the external power supply it likely tries to start, but then clicks off when it doesn't see the voltages it expects to come up.
Another way to test the power supply is to jumper the power on pin to the standby 3.3V (ideally with a 100 ohm or so resistor). This should cause at least one of the 12V rails to come up.
While it's probably not related to your problem I've noticed on some Bravias that the standby LED does not light when power is first applied. When the is switched on with either the front panel button or remote it will light green. If it is switched off with front panel button it will go off. If it is switched off with the remote it will light red. If it is flashing red the number of flashes is the fault code.
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