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Repair and disassembly information for Samsung's flagship S20 Android smartphone, released in March of 2020.

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Phone responsive but black screen: Broken motherboard or display?

Hello,

I come here to ask for some advice on my water damaged galaxy s20.

Back Story:

I was changing the battery on my phone and as was suggested in the iFixit guide, I applied alcohol to the battery area to loosen the adhesive. Unfortunately, I didn't read the label and ended up putting alcohol that only had about 40% alcohol. This caused me to unknowingly damage the phone.

Once I finished the install I turned the phone on and initially, everything worked fine. I went to turn on the camera and I was told camera failure and was sent back to the home screen. After half a minute or so the screen went black. I tried for a little longer to hard reset the phone until I decided to quickly take apart the phone again, unplug the battery and look for the problem.

After taking the phone fully apart I discovered some liquid in the sd card area. I dried it as much as I could and put everything into a bag with desiccant overnight. This morning I reassembled it and tried to turn it on but still the same problem. I then took the phone even further apart and found that the humidity indicator near the bottom of the phone also was pink (though I never saw liquid there myself). I also cleaned all the electronics with contact spray (made for electronics) and scrubbed with a toothbrush.

Problem:

Phone turns on, vibrates, makes noise, charges, takes touch input BUT fully black screen.

I don't know wether my motherboard or display is broken (or both!)?

Replacing the motherboard is not hard and not nearly as expensive as replacing the display but I also don't want to get a replacement motherboard only for the display to remain black...

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Any help is greatly appreciated!

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@christianf10507 check the display connector for any corrosion or bend pins as well as the components around it. Your issues sound pretty much like they are centered around the LCD.

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First of all, thanks for the answer!

I looked at the connector and could not find any bent pins. They seem to be aligned properly. Some pins look 'different' but I can't imagine that causing an issue. Unfortunately, I can't take a proper photo because my phone is dead :( Plus, considering that the display did work for some time, I can't imagine it being a problem with the connector, as that doesn't change with time.

As for corrosion, I cannot find any. I guess that makes sense because the phone was exposed to water for an hour or so at most.

At the moment I am considering buying a used s20 and then taking the mainboard from that to verify if the display is the issue or not. I can then repair my broken phone and re-sell or give it to a family member etc. Regarding that I have one quick question, the used one I am looking at is a s20 5G while the one I have is s20 4G. Do you think I will be able to put the motherboard from the 5G into the 4G to test the phone/display? I only need it to be able to turn on.

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There shouldn't be any issues using the S20 5G motherboard in an S20 4G, they are pretty much the same thing just one has 5G capabilities and one doesn't.

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@andreiniculae yes you can.

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Ok, that's good news. I think I'll just go the used phone route then.

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Since you put alcohol under the battery you might have gotten it in the display and damaged it in the process, it can also be a display connector issue, try cleaning it with 99% Isopropyl alcohol. If you can't get any sign of life you might have a broken screen, displays failing after being in contact with water is pretty common. You can get a new display at Samsung Galaxy S20 5G (USA) Screen and Battery - Genuine.

Samsung Galaxy S20 5G (USA) Screen and Battery - Genuine图片

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Samsung Galaxy S20 5G (USA) Screen and Battery - Genuine

$199.99

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Thanks for the answer!

Yeah I think I just have to accept I made a mistake and take it on the chin. I'll probably just buy a used s20 as a genuine screen costs pretty much the same amount in my area.

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Christian Friedmann 将永远感激不已
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