A white screen with silhouettes of the Amiga screen can also be a symptom of the display not switching into RGB mode. You know that the Scart plug can use Composite, S-Video and RGB, all sharing the same pins, so the display has to select the right mode. Check the voltage on the selector pin. The other thread says that you connected +12V to some pins on the VGA plug, so maybe you destroyed the 12V line on the Amiga. Or some fuse is blown. Does the serial port still work? It needs 12V, too.
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