[Motorola Droid 4] Khiraji:
Bumping this old thread in the event that someone in the future finds it useful. Obviously, replacing the speaker will VOID YOUR WARRANTY in every way possible, and if you're not careful will ruin your phone! But, if you're like me, your D4 is long out of warranty and it'll be a cold day in hell before you give up your keyboard.

That being said, I just replaced the speaker in my D4, after the stock speaker fizzled and died after almost 2 years. Every now and then it would "fuzz out" and I'd gently tap the phone against my head (which I'm sure looked quite comical) and it would stop. Finally the speaker gave up the ghost entirely and it was nearly impossible to hear. I used resources from this site to guide me in taking it apart.

You'll need a torx T5 and T3 driver -

DO NOT

try to use any substitute drivers if you don't have an official T5 or T3, like I did - you will strip the screws (they strip VERY easily) and you'll need to bust out the dremel to drill/grind away the screw, or buy a whole new LCD/digitizer assembly for $~70 (which, as of this posting, are getting harder to find). You might think that you can fudge it with an eyeglass repair flathead driver, but you can't. Trust me. T3 and T5 drivers are cheap online, do it right.

For the actual replacement speaker itself, I got a speaker for a Nokia Lumia 610 on ebay for about 4 bucks (free shipping!). It's almost identical to the stock D4 speaker, but it looks to be a little better quality and the actual place where noise comes out looks to be ever so slightly bigger. It "sits" in a little pocket in the outer housing/screen digitizer, held in place by the flex cable. You'll see once you get there.

Make sure both the dual snap connector that connects the mainboard to the screen/digitizer is securely fastened, and also make sure that the tiny snap connector that goes from the screen to the digitizer itself is securely fastened as well - this second snap connector is up by the notification LED. I scared myself when I re-assembled everything and my touchscreen didn't respond. Also, when you're working up by the notification LED, there's a small piece of white-ish rubber that sits between the actual LED itself and the little hole where light comes out on the front of the phone. It's crucial that you don't lose this - the LED is a few mm offset from the hole, and this piece of rubber glows and creates the notification light that you see on the front. Without it, no notification light.

Be careful with the mainboard, replacement units are very hard to find and will only get rarer as the D4 ages. It's basically the heart of your phone.

Tweezers and a "safe-open pry tool" (basically a piece of soft plastic to ease apart the pieces of your phone) make this process easier as well.

Another note: there are 2 hidden T5 screws behind the bezel that surrounds the rear camera and flash. When you go to peel this up, you'll probably ruin it - this is poor design IMO, and mostly inevitable. Good news though, replacement camera bezel parts are available online for a few bucks.

All in all, this process isn't difficult, but requires really good light (super bright lamp or headlamp) and will give you a greater appreciation for your phone and how it's both a magical little black box as well as just a collection of shiny bits.

Good luck!!