The problem is similar to
http://talk.maemo.org/showthread.php?t=74007
In order to replace the whole cable - the seemingly safest repair route - ten screws have to be removed, and though eight of them were unfastened with little problem, two of them are now utterly destroyed. But until they give way, and allow to see the part of cable which is within the screen, there is no way to replace the cable.
Even if I knew how to solder wires, the flex cable (connecting screen and keyboard) would be too delicate: about thirty very thin, closely situated wires. And even worse, the part of the torn cable attached to the screen is very short - one or two millimetres.
For now: how can I activate PC suite mode on N900 when touchscreen is entirely non-working? With keyboard only? So far, camera is the only application successfully functioning on screen-less N900. But in order to see/download images from N900, I need to be connected to it. Usually, I press "PC Suite Mode" in dialogue and then "sudo gainroot" and "ifup usb0" in XTerm. How can I do this without a screen?
I would be grateful for any advice or help. The screws are rusty, I will look around for a TV which might be used as a temporary screen for the N900, and I have to find more keyboard shortcuts.