Introduction: Quick and Easy Keypad Fix (For Most Cell Phones)

Most of us have cell phones and from time to time we tend to drop or maybe treat them with a less-than-delicate manner. In turn the cell phone will rebel and stop functioning.

Today's fix is real easy and depending on what tools you got, will probably take you between 10 to 15 minutes. It has to do with malfunctioning keypads. Generally, when a cell phone's keypad is not working properly it could be one of three different reasons:

1- Due to shock from a drop, circuitry is damaged thus no matter how hard you press you will never get the phone to register it. This issue is one that a certified technician would have to take care of and is nothing that we can fix here as it would be time consuming and expensive.

2- Because of moisture or heat, again, the circuitry could be damaged. Nothing to be done here really. The only thing to try best for a phone that's been subjected to moisture is to place it in a sealed container with rice. The rice will draw out the moisture and if there was not too much damage the phone should work fine. Click here to see a great Instructable that demonstrates this principle. Thank you keegsta123

3- The phone's keypad membrane is broken or dented. This is where we come in and fix the problem. Now keep in mind, the keypad membrane and the keypad itself are two different components; this is true for most models of cell phones, though there are exceptions. While the actual keypad is comprised of the buttons you press, the keypad membrane is what allows the keypad to register a touch to the circuit board (it is basically a thin, white, plasticated film with small metal sections of a hemisphere that act like mini Pogs). We will see what these look like and how it works later in the Instructable. Now on to the first step!

Step 1: Find the Phone

Step One of course is to find the phone and begin playing doctor. For my Instructable I will be using a different version of the Nokia 3530 but like I said, this fix should work with most phones, or phones that have a key pad membrane.

Go ahead and turn over the phone, remove the back cover and set this aside. Then turn the phone over again to the front.

Step 2: Phone Facelift...literally

Now feel around the side of the phone. You should be able to pry the faceplate of it fairly easily. If not, double check and make sure that there are no screws preventing you from taking this off; though this is highly unlikely, let's not rule it out.

Once you have this off, the keypad should easily come off as well. Take these three parts and put them off to the side for now. Be gentle as some of the shells will be fragile and all of them should have a clear plastic cover that fits over the screen to protect it  from dust, and other particles that might scratch it.

Step 3: Disassemble

The next step is to remove all the screws you can find. This is in order to remove the metal speaker housing as well as the clear plastic screen housing/connector, the keypad membrane for replacement (or repair) and the circuit board if you so wish to do so.

Cellphone screws will vary in what kind of screwdriver fitting they take. In my case, it took a torque screw fitting which was a little hard to find. That's where the Squirt Lethearman tool came in handy. Some others will even use mini phillips head fittings but whatever the fit, make sure you do not strip the screw, otherwise you will have a very hard time putting it back on, or taking it off at all; the Leathearman tool won't help you here since I tried on one of my Samsungs and the fitting was still too small.

Once you remove the screws I would advise putting these inside the faceplate so that you don't lose them.

Step 4: You Gotta Keep 'Em Separated...

Okay, we want to now take the following and separate them from each other in order to finish the job:

The metal speaker housing.

The clear, plastic screen housing.

The actual screen itself.

The keypad membrane.

As far as all the first three components are concerned you don't need these at all right now, other than for purposes of admiring their construction. In fact you can even leave the speaker housing and screen housing together with the screen sandwiched in between.

Step 5: Let's Go Back to the 90's for a Sec...

After you have put all those components aside take that keypad membrane and set it down with the metal Pogs facing you. This is the reason your keys weren't working.

The way the little metal Pogs work is that they sit on top of the little golden circles corresponding to each key. They are slightly larger so they don't make a connection. When you press a key, what happens is that the little bump in the actual keypad push the Pogs on the mebrane down. This creates a connection between the metal in the circuit board and the Pog that registers as a touch. When these little Pogs are dented as you can see here, you can press all you want but it won't make a proper connection an thus you won't be able to register a touch for that particular key.

You can do two things here:

1-Reshape the pog so that springs back whenever you press one it. To test this once you're done reshaping it. Put it back on the hard surface face down and press the corresponding Pog. In order to reshape it use a small metal screwdriver or something hard and just go around and flatten the middle but raise the sides of the individual Pog.

2- If the membrane is beyond repairing you will need to either buy one or makeshift one. This will be a really hard and precise task so if you don't want to put in that much time and effort I suggest you either get a new membrane or send it back to the company. If anything it might even be cheaper to buy a cell phone at any local Pawn shop.

I don't know where you could find an actual membrane and I've searched online but have only found obscure links to so I would try and see if your carrier's store might have a few laying around. 

Step 6: The End...is Only the Beginning.

For the final step, you should be familiar with all the parts that you just removed so this should be a piece of cake.

First, give your keypad membrane a cleanup if you stuck with option '1' of fixing it so it's nice and shiny. (Don't scrub too hard though.)

Second, place the screen housing, screen (make sure all the little magnifying lenses are there with it too), and speaker housing all back on top of the circuit board.

Third, screw back all the little screws.

Fourth, place the keypad down, then the faceplate (it should snap right back in place) and the battery with the backplate. 

Fifth, you're done!! If you followed every step properly then you should have fixed your keypad. Congrats! Now turn it on and enjoy.


Oh and here's  a freebie in the next step.

By the way guys. I have never done anything like this before. I just opened the phone up and learned as I went so if there is something broken sitting at your house, it's probably just begging to be opened and prodded. Who knows, it might be fixable and even if it isn't, it will still be a learning experience.

Best,


V




P.S. I just noticed the movie can't be seen unless it is downloaded. This is simply to show that the keys I fixed work. If you don't mind downloading it please do so, otherwise I am working to fix this.

Step 7: The Circuitboard

Here's just a little walkthrough of the circuitboard in case you were wondering what some of it's functions are. I'm no expert but from what I have read and heard I can impart at least that knowledge. 

Comments

author
shobo (author)2013-03-09

thanks man1it worked!

author
zack247 (author)2012-04-08

close, that reflective part is a part of the backlight assembly.
so are those reflective plastic sheets. if you look at it youll notice the screen has a piece of plastic behind it that is clear on the edges and opaque in the middle. those 2 little leds (where the reflective part kind of points at) shine into the plastic and the reflector helps spread the light. those thin sheets act as a sort of diffuser and spreads the light more evenly across the screen.

touching those parts wont really ruin your screen but it will hamper the performance.

and in step 7, thats not the charger, thats the vibration motor. the charger port is just beside the headset connections.

just my little bit of info :3

author
masterochicken (author)2010-06-06

I used to have this phone. I miss it.

author
Paul D (author)masterochicken2010-06-07

I had four of them and they were just sitting around I figured I might as well put em to use. But after years and years of not being used, being dropped in the water and all this other stuff, it amazes me how much more rugged cell design was even 10 years back. They trade apps, looks, interface, etc. for functionality and durability. Nowadays you have all these cheaply made phones with delicate material. Which reminds me, i need to get a Sonim...haha