ak,
I'm assuming that you have done you lpc rebuild correctly. It's not that hard, but we should be clear that everyone is on the same page.
Next, its been suggested that the female socket that comes soldered onto the chip is potentially faulty (this is news to me, but I did have a few that the LED would go intermittent, but this had no effect on my v1.3 box), so you could grab a female socket and solder one onto the vacant end of your aladdin chip (oppositte of the flashrom chip, duh) and try that.
Third, you said you flashed your chip. To super-verify the write, you could read the bios back off the chip and load it into Evtool to make sure there is no corruption (this should have been verified after the initial flash though).
Fourth, there are pics of the LPC and which voltage values each LPC point should have. you could bust out your trusty multimeter and test for values. some LPC voltage values are not DC though, so your simple multimeter won't give a true reading, but it's still good for debugging your LPC port pinheader.
Fifth, there are cheapmod pics about that show which LPC point is attatched to which pin on the 020 socket. these are good for testing continutiy between the header socket (either the one you soldered on or the one that came on the board) and where they meet up with the flashrom socket (this may be a bit advanced, I know I confused myself trying to read/write it).
If it were me, and I was confident that my programmer flashed my aladdin successfully, I would tie LFRAME to a screw or something (ground it out) which would tell the xbox to read from the LPC port. with your modchip removed the xbox should frag (flash red and green) if turned on now. turn box off. Then, putting the chip onto the pinheader and turning the box back on should boot your aladdin. I can say for all the super aladdin live (SAL) chips I have done, it is not necessary to mount D0 or BT to the chip to enable it. after you get the chip working you can worry about doing radical options like cut the LFRAME trace and such...
scube