Hi Andreas. I know my post is quite a while after your original, but I've got the same touchscreen with the same problem. Though, my Q5 transistor appears to have burned a bit worse than yours as I have a somewhat charred board around that part.:O/ I guess my vm7000 was tired after working hard for a whole 30 days before burning up! I also noticed the toroid had most of its resin melted off too ... did yours look screwy at all? That might help explain some of the icky flicker on the screen when it was working but shouldn't have caused any other issues I don't think ... just means this thing is poorly designed and doesn't dissipate heat well.:O(
Did you actually try using it in your car? Mine never made it out of the house. Something tells me I'll need to find a use for this thing other than in the car, assuming I can fix it.?
Anyway, I've done a bit of googling myself but can't seem to find any reference to the label printed on that part -- were you eventually able to resolve a real part name/number? I'm debating on whether I should even mess with it though ... even if I can fix it, this thing clearly has a heat problem and I'd rather not have to replace transistors every month in order to use it. Something tells me I'd be better off buying an LCD made warrantied by a *real* company and not generic "white-box" OEM like this thing.
Thanks in advance for any feedback you might have ...