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So I sandwiched the bleedy screen between a couple of bits of watch glass from some cheap analogs, and sealed it up with some hot glue and a tube running from it... Fired up the vacuum pump and got nothing. Hm. Busted out the heat gun and gave it a bit, only to realise that would make the glue fail.
But then I noticed the black splodges had changed... I got all the glue out of the picture and turned the upper glass over - one side was flat and the other slightly domed - and used it to smoosh the fluid around. If there was less bleed, this method would probably have allowed me to get it outside the visible region, since it provides a lot more control than rubbing the screen with your thumb, which obviously isn't transparent...
It seems I've lost too much fluid out of this screen. I tried to google up a source for it, but only found a forum post by some guy saying it's impossible to get. So then I tried pillaging some from a stack of old phones... There is not much fluid in an LCD. You might be able to get half a drop from a 5" screen, but I'm not sure how... It's very thin stuff, and my attempts to pick it up with a blade were getting a pretty low return.
The idea was to put a bead of it along the edge of my screen and try to work some of the bubble out, and when I release the pressure, rather than air coming back in, some of the fluid would be sucked in. Maybe that happened to a small degree, but it was hard to say; I ran out of screens. I think the best way to harvest the fluid might be to get a tablet screen and dremel off a corner, and use a rolling pin... Not sure what the best way of getting it into my screen is, though.
Oh, and I realised a bit late that the fluid was probably nasty stuff; should've been wearing gloves from the start.
NOS DBX-100 arrived 😃
No leaks inside it; it fired straight up with fresh batteries. I read somewhere the screen bleed is due to air getting in; maybe I can fix that with my vacuum pump. The screen from the old one only has a tiny bit of bleed.