dead sanguinololu?

[amerrigan]

It's looking my Sanguinololu control board died on my Geeetech aluminum i3, Banggood are kindly replacing it with the GT2560 (but that will be weeks away...) wondering if you guys had any experiences resurrecting these boards?

So a couple of nights ago the heated bed refused to work, no temp no power, thought I smelt melted plastic (the irony here, right?) unhooked the Sanguinololu board and it cables, noticed the hotbed wires were unplugged, further inspection they were charred and the screw down terminal block melted (which had caused the hotbed cables to come unplugged).

Left the hotbed unplugged tested again at this point everything was working, other than the hotbed. Stupidly during reassembly I'd plugged the LCD2008/SD card header whilst power was live; I've done this before and fragged a stepper driver (board shows no COM port and LCD refuses to turn on)

Took it apart and desoldered the PCB terminal block, got a replacement from Maplin and resoldered it; found the faulty stepper driver (lifted all until COM port showed in Windows) and the A4988 replaced it with a DR8825 (remembered to drop stepping from /32 to /16)

Reassembled everything and still nothing.

Observations:

5V regulator is insanely hot (I hear this can be a problem with 5V USB and 12V power in on the Sanguinololu 1.3a board

LCD powers but shows two thick black lines

although COM port shows in Windows (assuming the FDTI chip is ok) I cannot seem to connect to the ATMega1268a (either to flash firmware or via console)

Putty serial connection to COM10 shows garbage on screen.

Any advice or shall I just find a local RAMPS board until the GT2560 turns up?

Tony