Samsung Galaxy S4 mainboard repair guide

Remove the logic board after a water damage

In this repair guide, we show you how to remove your Samsung Galaxy S4’s logic board on your own. You need to remove the logic board if you want to clean it after water damage.

Required tools

Menda ESD Spudger

Menda ESD Spudger

You need a flat plastic prying tool to disconnect the various plugs and connectors.
€8.00 at the iDoc store
Steel Laboratory Spatula

Steel Laboratory Spatula

You need a flat and sturdy prying tool to disconnect glued parts.
€4.00 at the iDoc store
Phillips PH00 screwdriver

Phillips PH00 screwdriver

You need the right screwdriver for removing PH00 screws.
€14.00 at the iDoc store

Required replacement part

Samsung Galaxy S4 Logic Board

Samsung Galaxy S4 Logic Board

on Amazon

Show all replacement parts for the Galaxy S4

Passendes Werkzeug

Mit unserem Werkzeug gelingt dir die Reparatur.

Samsung Toolkit, 17 pieces

for €59.00

Steps

13 Steps

Removing the back cover

Step 1

Removing the battery

Step 2

Removing the SIM card

Step 3

Removing the plastic cover

Step 4

Disconnecting the connectors

Step 5

Removing the logic board

Step 6

Installing the logic board

Step 7

Connecting the connections

Step 8

Attaching the plastic cover

Step 9

Inserting the SIM and microSD cards

Step 10

Installing the battery

Step 11

Attaching the back cover

Step 12

Final test

Step 13

Getting started with the repair of your Galaxy S4

If you get stuck or have questions, you can post a comment. We’d be happy to help.

13 steps

Removing the back cover
Insert the spudger into the gap next to the headphones. There are 16 clips on the outside under the back cover. You have to disconnect them by moving the spudger around the entire smartphone one time. Alternatively, you can detach the back cover using your fingernails.

Then you can take off the back cover.
Removing the battery
If your Samsung Galaxy’s still on, turn it off by holding down the standby button for about three seconds and following the prompt on the display.

Now use the spudger or your fingertip to lift the battery (see figure 1) and then remove it (see figure 2).
Removing the SIM card
Use the spudger or your finger to push the SIM card all the way into the slot (see figure 1). After a gentle click, the SIM card will come out (see figure 2).

Now you can pull it out with your fingers.

Repeat this process if you’ve installed a microSD card.
Removing the plastic cover
Remove the 9 Phillips screws that hold the plastic cover in place (see figure 1).
9 x 4.0 mm Phillips screws

Lift the cover and the chrome frame to remove them. The cover is attached to the display at 14 points. Insert the spudger between the chrome frame and the display. Start at the level of the Home button (see figure 2) and move the spudger once around the entire phone to detach all connections (see figures 3 and 4). Then you can remove the midframe.
Disconnecting the connectors
Now you can disconnect the following six connectors. Be very careful (see figure 1).
LCD/touchscreen
USB connector
Front camera
Earpiece
Antenna cable
Headphone output
Make sure you don’t break off the resistors that are soldered onto the logic board.

Place the pointed tip of the spudger very slightly below the contact and carefully lift it up. The pictures show where you should put the spudger to avoid breaking off the little resistors even if it slips (see figures 2 to 5).
Removing the logic board
Remove the screw holding the logic board in place (see figure 1).
1 x 3.0 mm Phillips screw

Now you can carefully lift the logic board using the spudger (see figure 2) and remove it by hand (see figure 3). The rear camera sometimes sticks a little bit. Be careful.

Installing the logic board
Now put the logic board back in the frame. Start with the rear camera connected to the logic board. Once it’s fitted correctly, you can install the rest of the logic board (see figure 1).

Make sure the cables don’t get under the logic board.

Use the picture to check whether your logic board is positioned correctly (see figure 2).

Now fasten the screw for the logic board (see figure 3).
1 x 3.0 mm Phillips screw
Connecting the connections
Now put the following five connectors back in the corresponding slots. Use your finger to carefully press them into place. Only use as much pressure as you need for the contacts to gently click into place.
LCD/touchscreen
USB connector
Front camera
Earpiece
Headphone output
Antenna cable
Attaching the plastic cover
Now put on the plastic cover and make sure that it clicks into place properly on all sides.

Then screw it on.
9 x 4.0 mm Phillips screws
Inserting the SIM and microSD cards
Now slide the SIM card and the microSD card, if you have one, back into the corresponding slots.
Installing the battery
Put the battery back in. The +/- symbols have to be touching the contact point.
Attaching the back cover
It’s very easy to put the back cover back on. Put it on in the correct position and press it on all the way around the phone until it’s completely clicked into place.
Final test
Start your Samsung Galaxy S4 and enter the following key combination:
*#0*#

Then press the call button.

Now you can check all the functions.