Skip to main content

Saving/Restoring Electronic Devices From Liquid Damage

 the most important thing you can do is shut it off!


If possible pull the plug and if it has a battery that's removable disconnect it asap.

Ever spilled on a phone laptop tv game system, pc or other electronic device? Most of the time it's not ruined but you have to act quickly. Bellow I'll show you the repair operation on my last DSL modem.

But first here's what you need to do to save your device:

1) TURN IT OFF!

Damage to electronics usually isn't done by the water or liquid itself, it's primarly the short circuits it creates. 

LCDs are one exception, water will get between the layers and you can usually save the screen but you will never restore the image quality with our replacing it. 

That said...general rule of thumb is off asap.

operating submerged in water stuff will experience accelerated corrosion. It's not great for it to run underwater but what we really want to prevent is damage from short circuits.

2) PULL THE PLUG AND OR REMOVE BATTERIES!

If it plugs into the wall or a charge cable; disconnect/unplug right away. If there is a removable battery; remove it.

Long after you've fetched the phone from the toilet, the inside of the phone remains wet.

Even after it dries all the dirt and crap that crept in from you pocket/environment has been mixed with the liquid and deposited as a sludge across all the pins and traces of the circuit board inside.

So for the same reason you want to cease the power flow while it's wet you want to keep it off until someone can clean the inside. This deposited sludge can easily need to short circuits that will cause permanent damage if you attempt to power the device back on or leave it on. 

What Next?

Disassembly and 99.9 percent isopropyl rubbing alcohol. sometimes distilled water and or a drop no more of dish soap alternated. Either or both of the two with an anti static brush.

Followed by thorough drying testing and reassembly.

I've brought countless laptops and quite a few phones back with this process. 

Special Cases/Cans


Note the metal square with holes. (Also sorry for the blurry, I'm writing this a year later and with only pics I happen to have)


The rf can circled would be the one to take the hit. The hit that prevented the modem from operating untill the can was removed and the board washed.


Sometimes metal cans that serve as Faraday's cages are soldered to circuit boards. 

The real devil is those little holes. 

This means that if there's a short or deposit for f gunk under them you won't be able to brush it off. 

The bigger devil is called thermal mass. You might think I'll grab a soldering iron and yank it. Goof luck. Circuit boards have multiple layers; there's usually a pretty solid one known as a ground plane. This matters because you are fighting a lot of copper and all of the heat from your iron is going to get sucked up by that copper when you try to touch it to the rf can that you wish to remove.

There's a few ways to combat this. Having the right tools really helps. Having the right solder and flux will both help as well. 

I recommend you use a combination of 

a high-powered smd rework station 

Hot plate

Preheating the entire board somewhere below the point solder melts. This helps you melt the intended solder with out as much risk of frying the components.

Low melt alloy. This is a solder that mixes with whatever solder is already there and lowers the melting temperature of the combination.

You will need plenty of flux and solder wick as well.







Comments

Popular Content

Lawn Tractor Snow Plow Electric Upgrade

Do you have a lawn tractor you use to plow snow? Ever wondered if you could make a manual snow plow attachment into a push button? A friend of mine had a riding lawn mower and snow plow blade attachment. Every winter he used the riding lawn mower to plow the driveway. The plow was a kit that bolted on the front of the lawn tractor and it had a mechanicaly actuated adjustable snow plow blade. The issue and this project came about when the arm to adjust the snow plow blade broke. I had just bought a mig welder. I had also watched linear actuators capable of handling 300lbs of force drop to $25 on ebay.  Here's what I came up with for converting a riding lawn mower snow plow into an electricity adjusted lawn tractor plow. Repair  The lawn tractor snow plow kit had seen better days. The fork that attaches it had bent /deflected and spread. I used a map gas torch and a bench vise to squeeze the tongs back and then welded some L channel angle iron on the sides. Less Play I also tack weld

UV Lithography For Circuit Board Creation

In this multi part series on diy circuit board manufacturing/fabrication I'm going to cover my diy, vacuum pull down UV LED exposure box. If you are looking for a description of the entire fab process click here UV Exposure Rig The photos bellow are of the  uv lithography exposure box I cobbled together. It also features vacuum pull down.  The source: A 4.1w High luminous efficiency 365nm UV LED. Sourced from digi key mid 2016. Model  LZ1-00UV00

CD Resistance Spot Welder

This post is for anyone interested in owning or building a CD welder. I wanted a reliable Resistive spot welder for lithium ion pack construction and or repair. I didn't want to spend 3k or buy from china. I decided to design and fabricate my own. Bellow is my first crack at a Mosfet Switched capacitive discharge mcu controlled spot welder. This post is a work in progress. If you've stumbled across in hoping to build your own cd welder feel free to ask questions in the comments section.  I'll provide any help I can.  My CD Spot Welder  Here's pics of the first working version from 2018