To repair your Samsung Galaxy S4 you will need.....

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a small Philips and bladed screwdriver and a plastic separation tool

you can use a spudger
guitar pick
plastic knife
or your thumbnail
you might also need to use some tweezers
and a small pin
make sure the device is
completely shut down
now remove the battery cover
if your battery cover supports wireless charging
they will be a small circuit in the back
which will connect with one of these sets of contacts
now remove the battery
take out your sim and micro sd card
to remove the loudspeaker, undo these 4 screws
these are all the same size
so do not worry about getting them mixed up
using a plastic tool so you do not damage the case
gently lift each side
to release a clip
then you can lift the speaker assembly away
these gold contacts
are for the loudspeaker
and these 2 silver contacts
are for your 3G and GSM antenna
this small hole is a air vent for the loudspeaker
now we can undo the rest of the case screws
again these are the same size
now we need to release
clips around the outside edge
using your thumbnail or a plastic tool
start from the bottom
and slowly work your way around the outside edge
I have marked where the clips are in white
if you do not have a guitar pick
you can use a plastic knife
keep releasing those clips
around the outside
now lift the rear housing away
this is the contact for the wi-fi and bluetooth antenna
which you can see on the rear
and this is the contact for the GPS antenna 
and this is the infrared blaster led lens
you might need to remove this and switch this over to your new case
these are the contacts for the 4G antenna
this is a moisture sensor which changes colour if its been wet
and if your new case does not come with these foam pads
then you can switch these over to your new one
you can remove and replace the volume and power switch
by lifting each end
at the bottom this is the hole for the main voice microphone
you might need to switch this rubber gasket over to a new case
when you put it back in make sure it sits down
nice and flat
and this small white paper is also a moisture sensor
to remove the micro usb and microphone assembly
we need to lift this metal clamp
it is tempting to lever on this side
but you might damage the circuit board
so come over to this side 
and twist and lift the metal clamp up
then put that aside
now very carefully and gently unplug the
3G and GSM antenna flex cable
now unplug the touch and home key flex cable
small amount of adhesive
holding that down
now unplug this flex cable
and there is a small amount of double tape holding this in place
now using a thin blade or a screwdriver
gently ease and lift this away from the casing
this is the main voice microphone
and the sound enters through this small hole
these connections are for the 3G/GSM antenna
and these are for the loudspeaker
to remove the micro sd and sim tray
disconnect this flex cable
and using a thin blade
separate the double adhesive that holds it in place
you can use some heat from a hair dryer or 
 fan heater to make this a bit easier
and if you are replacing it
do not worry too much about any damage
to remove the earpiece, proximity sensor and camera
lift this small bracket up
and put that aside
disconnect the front camera
and disconnect the earpiece
gently lift that away
and ease the earpiece out of the case
this is an infrared led
and this is the proximity and gesture sensor
if you are replacing this, it might not come with this rubber gasket
so you need to lift this off
from the old one
and change it over to your new one
there is also a plastic spacer
which you may need to swop over to your new part
try and keep this double adhesive on the plastic spacer
if your new flex cable does not come with double adhesive already attached
you might be able to reuse this tape
when you put it back together
hold the plastic spacer this way round
place your cable on
once you are happy that is lined up
bring the sensor down
and push it into place
and then you can put that aside
to remove the headphone socket we need to remove the mainboard
start by undoing this single black screw
and gently disconnect this antenna flex cable
and put that aside
disconnect the main screen flex cable
and this one is for the headphone socket and ambient light sensor 
and now we can lift the mainboard away
be careful of the camera
make sure the camera is released
this is volume up
and volume down
your screen lock and power switch
and these contacts are for the vibrating motor
to remove the main camera
disconnect the flex cable
and if you need to replace the glass lens
gently ease this metal frame off of the camera
you can use some heat to soften the adhesive
using a small pin or needle
you can lever the glass up
its quite a strong double sided adhesive
again you can use some heat to make this easier
then put your replacement back on
and replace the metal bezel, make sure the 3 pins
are facing away from the flex connector
and we can put that aside
this is an external test port for the 3g/gsm radio
and this test port is for the 4g radio
these 2 microphones, receive their sound through these 2 small holes
and this is your led flash
and this is the wireless charging connections
to remove the headphone socket
undo this single silver screw
this is quite a bit smaller than the others 
 so you cannot get it mixed up
now lift that away
this contains the notification led
and ambient light sensor 
this also contains 2 rubber microphone gaskets
which you might need to switch over a new headphone socket
this can be quite tricky as they are very small
hopefully your new headphone socket will come with these
already fitted
if not you can swop them over
and make sure that sits all the way in
and nice and flat
and there is another rubber gasket
and this microphone gasket is for the front facing camera
once you are happy they are sitting down nicely
put the ambient light sensor back in place
you might also need to remove this rubber gasket from the headphone socket
and then transfer that over to your new one
now you can put that aside
now we can remove the vibrating motor
and if your new screen does not come with this notification led diffuser
make sure you swap this over to your new screen
if your replacement screen does not come with this heatsink compound
you will need to remove it and swap it over to your new one
without this the processor will get hot and the phone will run slow
if you need to replace your home key flex cable
or you are replacing the screen or the frame
you can click the link up here, for 
 a video on how to do this
to reassemble
place the vibrating motor, into its hole
make sure the small pin lines up with the circuit board
now replace the headphone socket
and replace that short silver screw
now replace the camera back onto the mainboard
slide that in from the side
and plug it in
now lift the flex cable for the headphone socket up
place the mainboard
down
make sure the camera locates
and now we can replace that single back screw
now reconnect the screen cable
the headphone socket and ambient light sensor
now the earpiece, proximity and gesture sensor
make sure that goes all the way down
make sure the proximity sensor is pushed all the way down
up against the glass
otherwise the screen will go blank during voice calls
reconnect the cable
replace the front camera
now replace the sim and sd tray
remove the protective film if it is a new one
and when you place it on
make sure these white marks
line