A large smartphone by LG, released in fall 2014. The LG boasts a Quad HD IPS display and a 13-megapixel camera.

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Can I submerge my motherboard to attempt to fix my mic?

Hi,

First off, I think that there was a sticky liquid of some sorts that came in contact with my phone. The back of my phone beside the battery is sticky.

Also, my mic isn't working when I am using the earpiece, but it does work when I use speakerphone.

Could I attempt to fix the issue by submerging the motherboard in 91% isopropyl alcohol? Are there any risks involved with this?

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I would think so, but I've not had experience with doing so on the model you mention. However, I've used my ultrasonic cleaner to clean just about anything and everything possible and so far no problems.

Make sure, that you take the time to remove any metal shields on the board. This is important and some half-assed techs will just take a phone apart and dump the whole board in solution. Some may fix, but if you don't remove the shields you're reducing the percentage that will be fixed immensely.

1. Remove all metal shields with a hot air rework station (if possible, if you don't have one, use a normal heat gun or at least a soldering iron but be careful--there are guides on YouTube and probably right here).

2. Treat the board with the solution

3. For best results also use an anti-static brush to remove any additional gunk not done by the alcohol.

Voila! You should be in business....

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Take the phone apart and clean it but before you do clean it look for the source of the sticky liquid if its from the battery you need to clean it with a different solution . If the lithium battery is leaking dont use IP alcohol use straight distilled water . If its not the battery leaking then clean with 90+% IPalcohol. This guide will help with the cleanup. Hope this helps

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