Is it possible to use this kind of epoxy?



I'm unfamiliar with this, so I'm also attaching the directions it came with. The epoxy itself is in the case at the right side of the picture. It has the white substance at the center and the green substance around it. You mix it with your hands.

It is something that you mix with your hands and it is already somehow solid, so it should be easy not to go into the slots. However, I'm not sure whether it will stick or fit for that purpose.

guys stop using epoxy . is not appropriate for this purpose .
epoxy have weak adherence on pcb green paint . you can test it using an old computer board trying to stick something on it. the only way is solder alloy . epoxi can be used only on base wich is fiberglass epoxy ( under green layer on etchted zone ) but n900 pcb have copper on most of the surface

And one more question (even if it is a bit late). Is it ok to use superglue?

I've N900 open right now and have already put some superglue (carefully) at the
bottom, in order to glue the metal with the plastic.

Have I just destroyed N900?

you just did the worst thing
superglue vapor will condense on gold contacts
after a while the glue become brittle

I didn't understand 100% of what you said. You mean that the contacts will become worst, or that the glue will break at some time?

I only put instant glue at some points at the bottom, between the plastic and the USB connector.

yes , the glue will break at some time

the glue vapor (fumes ) can make glue deposits on contacts and guess what will be hapen... no good electrical contact between socket and plug . if this hapen you can remove superglue from contacts using acetone . be very careful with acetone . don't touch anything else than usb port
if you have problems with contacts avoid mechanical cleaning
you can remove gold from contacts wich thickness is only few microns

I used that solid epox. It seems to have glued well and is *very* easy to apply. Even if it didn't glue well, it doesn't allow the usb slot to move at all, so it should be ok.

As for the instant-glue part, the one thing that I thought a bit late is that I could have left the plug inside while applying it. That would stop fumes from going on the contacts (if they want anyway). The instant glue seemed to fit very well under the slot.

Here are some screenshots and an off-topic "wtf" thing.

Before:


After:



And the thing: What is this???


it seems to always face down but it can't be part of the accelerometer because it doesn't move smoothly. I'd guess that it is a device to determine where N900 faces (i.e. for snooze) , but AFAIK that is not described anywhere.

@v13: that's actually the vibrator

And why pray tell should anyone avoid toucing anythign else on the board with acetone? Every electronic refurbishment centre I have seen uses a acetone based solvent to clean PCB's. Being an organic based solvent I dont believe it reacts with metals in any way.

but plastics do
secondary board support is made of plastic, keboards . damages can happen