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Testing Samsung Galaxy Displays

It is always important to test your display before fully installing it. Defects are a part of the repair industry and we understand that. Not only does this help the RMA process go a lot smoother, but it also helps us correct any potential part issues in the future.

When we receive a return, we evaluate the part and its' current condition to determine whether it is a defective part or if it was damaged during installation. Unfortunately, most suppliers can’t issue credit on a part that was damaged during installation. But, if defective, eTech will be more than happy to credit you for those parts. Check out our return policy here. Truly defective parts will have plastic covering installed and free of any major physical damage. Let’s cover how to correctly test a Samsung screen throughout all different models.

Once you have disassembled the device and have access to the main logic board, disconnect the battery. Some devices, like the Galaxy S5, will have a removable battery. Now, it is time to test your new screen assembly. In this crucial step, you are able to identify if replacing the screen will resolve the device issue and any potential problems with the replacement part. Once glued in, the new screen assembly is extremely difficult to take out without damage. Here is a quick overview of how to test the Samsung screens prior to full install.

Step 1:

Lay your new display on the left-hand side of your device with the front of the screen facing up and the device face down.

Step 2:

Plug the display flex cable into the logic board (remember to ensure that the battery is disconnected first).

Step 3:

Plug in the battery flex cable.

Step 4:

Power on the device. Depending on which model you are working on, this next step will be slightly different. Some models have a power button that plugs into the logic board, while others have contacts. Use the pictures below to identity whether your device plugs in or uses contacts.

4A: If your device has a plugin power button cable, go ahead and plug it into the logic board.  Press the power button until you see the device boot up.

4B: If your device uses contacts, you are going to need a pair of metal tweezers. Apply slight pressure to the top of the logic board to hold it in place and touch each end of the tweezer to contacts on the logic board as shown. Hold it in place until the powers on.

4C: If your device uses contacts and they are located under the logic board, apply slight pressure to the board with one finger on one of the metal shields near the power button. This will ensure that the board makes contact with the power flex cable and that when pressed the signal will be sent to the logic board.

Step 5:

Test the display to make sure there aren’t any defects. Defects include (but are not limited to) dead spots, dead pixels, pressure points, or backlight bleed. (See pictures below) These are all display related issues, but you also want to make sure that your touch screen is fully functional. To test your touch screen, hold down one of the applications from the main menu and drag it across the screen. If the application drops off on its own, there may be an issue with the touch screen. Try it a few more times and if the issue persists, disconnect and reconnect the display cable.

 

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