When dismantling any phone, great care should be taken to ensure that no damage is caused to any of the parts. Rough handling may result in severe damage of many parts, and if proper anti-static procedures are not followed, electrostatic damage may result in any electronic component.
Before commencing, it is recommended that the correct tools are purchased for the job in hand. At the very least, you will require a Torx T6 screwdriver. Do NOT attempt to use a small Allen key or filed down screwdriver, you will only damage the screws.
Step 1. Remove the back battery cover, battery & SIM card.
Step 2. Using a Torx T6 screwdriver, remove the two screws marked in red. Once these screws have been removed, you can unclip the front fascia beginning at the two points shown on the photograph below marked by the blue arrows. This will loosen one side of the fascia. The top edge of the fascia is still held in place by several plastic lugs - take care releasing these, as they are easily damaged if too much force is applied - they can be easily released by gently squeezing the casing directly below each lug.
Step 3. With the screws removed, and the lugs released, you can now lift the front fascia away from the phone and remove the three key mats.
Step 4. Using a Torx T6 again, remove the screws marked in red taking note where each one belongs, as there are several sizes of screw used in this phone. After these have been removed, the screen/keyboard assembly can be removed by releasing the two plastic lugs marked in blue using your fingernail, or a flat-bladed screwdriver and lifting it away from the body of the phone.
Step 5. Below is the view you should see once the screen and keyboard assembly has been removed.
Step 6. The next step is to remove the remaining three screws marked in red.
Step 7. Now that the three retaining screws have been removed, you can lift the circuit board away from the phone. At this time, the two headphone sockets will more than likely fall out of the casing, and their positions are marked below in blue.
Step 8. The Nokia 5510 is based on a 3330, and you can now see (and remove) the phone part of the handset simply by lifting it away from the chassis. Also shown below are the connector block, and the two headphone connectors. Your next step is to remove the four screws marked below to release the plastic framework and allow access to the RF module.
Step 9. If you've followed the steps above correctly, you should now be able to separate the three main components of the phone as shown below.
Step 10. With the frame and circuit board out of the way, you will be able to remove the remaining parts. Power button cover, battery contacts, vibra motor, SIM card connector and the buzzer assembly. These are all removed by simply lifting them away from the main chassis of the phone, but take care with the battery contacts not to bend the thin flexible contacts that pass through to the back of the handset.
Step 11. Re-assembly is a simple (or not so simple) reversal of the above steps. Take care to align the phone (RF module) when replacing it in the main chassis - there are a couple of plastic lugs that must be seated correctly if the phone is to go back together properly. After re-assembly, take time to ensure that all the buttons work freely, and that all functions of the phone work properly - take your time, and make sure that you get the right screws in the right holes.