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The LG V40 ThinQ Android smartphone was released in October 2018. The V40 was LG's first smartphone to feature five total cameras.

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Display working but touchscreen isn't, any ideas how I can fix it?

Hey guys,

Need help on this one. So, I charged my LG V40, then suddenly, a notification popped up, when I opened my phone the display turned on but as I touch the screen, it doesn’t respond to my touch.

Tracking back on what I did, I submerged my phone underwater because I want to cool it off (I know, stupid idea), but I didn’t charge it right away. I went outside for an hour bringing it with me and when I got home I charged it (confident enough that it’s already dry).

I know what I did is stupid, but any answer from the thread will be a great help. I really want to fix it since I love using that phone and planning to buy a new one til next year.

Thanks!

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Hi,

Your phone has an IP68 rating. That means that it is water resistant, not waterproof. Also things may have happened to the phone since you’ve had it which may have damaged the water resistant integrity of the phone e.g. slight unnoticed crack or bend in the case perhaps, who knows.

As you have found out water, electronics and electricity are not a good mix.

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the phone's operating design and could damage the components. The corrosion starts immediately and is ongoing until it has been properly cleaned away

First do not turn on your phone and then you need to remove the battery as soon as possible from the phone to minimize any further damage.

Then you need to dis-assemble the rest of the phone and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion etc. Do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do check the label to verify the amount of IPA. The higher the percentage of IPA the better.

Here is a link that describes the process.

Electronics Water Damage

As always with electronics, especially surface mounted PCBs be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board.

Hopefully after you have done all this the phone might possibly work correctly again.

Here’s a link to a teardown video of your phone, which may be of some help.

If this process seems too daunting, take your phone to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.

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Thanks man! Gonna try this one out hopefully it will come out positive. Will follow up on this thread to make sure other people will find this helpful.

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I had to do things myself because there are no open shops for repair because of the lockdown. Already cleaned my phone with the alcohol and waited to let it dry. When I assembled it all back, display had a green flickering screen mixed with white and purple. What did I do wrong? Should I buy a new display? Is it still fixable? If not, I'll just buy a new phone because it seems expensive trying to fix it. Haha

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Any answer will help. Thanks!

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@jezreeldlord ,

Did you also remove the shields from over the components and remove any flex cables from their connectors and clean there with IPA 99%+ as well? Water can get in under the shields or into the cable ends/connecters and the corrosion will continue unless it is cleaned away properly

If so then as a DIY repair the only thing that you can do is to temporarily replace the display assembly to find out whether the problem is on the systemboard or in the display.

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