Wow, thanks guys for your answers! and for the ref!!
I think it's not working because the chip is broken in two in one GT, and missing in another one:mrgreen:
I got a third one which is supposedly working (waiting for a new screen, 6260 mod done) on which I measured 9 point 50something Volt on the left pin (same as the PSU), 0V on center pin and 9.0V on right pin.
That's what made me think (obviously wrong, it seems) that it was a 9V voltage regulator.