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How to preserve the GSM functionality on a Nokia N900
Nokia N900 has a tendency to to lose all GSM functionality due to a hardware problem on its solder pads. This is unfortunate as the N900 is a truly unique mobile device. There are fixes on the web with glues and metal springs. I found a Sugru solution to be easier.
Kit
- Torx 6 screwdriver
- Phillips 0 screwdriver
- A slot screwdriver or similar
- 1 pack of Sugru
Step 1
Refer to a N900 disassembly guide to obtain the PCB. You do not have to disassemble the LCD, just remove it. I used the blue 'crowbar' for leverage. The GSM chips are next to the SIM reader, but under an aluminium cover. Removing that cover is tricky. I used a small slot screwdriver to slowly remove the hinges
Step 2
Apply some Sugru on the chips. I used the plastic tool above to flatten the Sugru, and cut and remove some excess. Put it enough to gain a height of about 1mm over the metal frame, not more. Then wait for 6 hours.
Step 3
OPTIONAL: N900 is known to have some Micro USB mounting issues. You can reinforce the USB port with the leftover. Insert a cable before you start, otherwise Sugru will leak inside the connector. Also make sure the plastic case of N900 still fits.
Step 4
This should not happen. If your Sugru leaks from the holes, you closed the cover prematurely. Open the cover, clean it, add a tiny bit, flatten, and wait more.
