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Repair and disassembly information for Samsung's S22 Ultra smartphone, released in February 2022.

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How to Repair Dimming of Bottom Half of Display

Hi!

The bottom half of my S22 Ultra has been flickering. In my attached picture, you can see that the bottom half of my phone is dim. My phone will flicker between dim and normal.

I'm guessing that a connection somewhere inside the phone is loose, so the bottom half of the display is not getting full power.

If I open up my phone, is there something I could check with a multimeter? Is there a part that I can replace that will likely fix this issue? For example, I notice that AliExpress sell replacement cable parts like these. How would I go about determining whether say the LCD cable is the defective part?

Or is there a connection that I can check with my multimeter and then fix via soldering?

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Hi Roger,

I've already given my answer to your question, but wanted to note that your picture didn't come through. Use this guide to add it to your question.

Adding images to an existing question

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There is a (replaceable) cable connecting the screen to the motherboard that could theoretically be the source of the problem. To get to it, you'll need to remove the back cover and the wireless charging coil. Follow the screen replacement guide up to Step 19, at which point you'll see the flex cable in question.

Samsung Galaxy S22 Ultra Screen and Battery Assembly Replacement - iFixit Repair Guide

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Unplug the connector, then check both sides on each end for any bent, broken or missing pins. If everything looks good, clean all four connectors with 90% or higher concentration isopropyl (rubbing) alcohol, give them a minute to dry, then reassemble and test.

If messing with the flex cable doesn't help, my next step would be to go ahead and replace it. Although it's extremely rare for a cable to fail, the next step after that would be to replace the screen, so I'd try the cable first since it's going to be cheap. If that doesn't help, you're pretty much left with having to buy a new screen, as it's almost unheard of for the GPU to fail on a phone; by far 98% of issues like you're describing are going to be caused by a failed screen.

When shopping for a replacement part, try to find one that allows returns. Most vendors will take a screen back if it hasn't been installed; all you have to do is open up the phone as I've already described, then unplug the bottom end of the display flex cable and plug it into the new screen. Power the phone up and verify that the problem is gone. If it is, go ahead with replacement, and if not you can then return the screen.

Note that iFixit's guide is for a screen replacement that comes with the battery already installed; in your case I'd use a guide from the Spanish site Nadie Me Llama Gallina, as it shows the process for a screen+frame assembly that doesn't include the battery.

Manuales / Samsung Galaxy S22 Ultra / Pantalla completa - Nadie Me Llama Gallina

Good luck, and let us know what you find and how it all turns out!

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This is an amazing answer. I will try everything you recommended! I've already ordered a new cable I could try. It should get to me in a week. I will keep you updated on how everything goes.

Just out of curiosity, wouldn't the likely cause be due to a connection that is disconnected partially? Wouldn't this explain the flickering? The current of electricity isn't able to jump across a separated connection.

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@rogermoore51234 Yes, it could indeed, but in most phones (including yours), the connectors are held firmly in place by brackets and/or other components like the lower speaker. So it's extremely rare for any connector to come unplugged unless there's another cause such as a swelling battery, for example. That's why I don't have a lot of confidence that reseating connectors is going to help, but given the cost of a screen replacement, it's well worth a try.

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@rogermoore51234 With regard to your conjecture about a partial disconnection, you may well be right, but in this case the connection I'm thinking of is the delicate connections between the screen glass and the flex cable leading to the motherboard. When those get disrupted they're not repairable; the only solution in that case is a screen replacement.

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@dadibrokeit Thanks for the detailed response! It's really hard to find both patient and intelligent individuals.

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Roger Moore crwdns2934231:0crwdne2934231:0
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