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Recondition Your HTC EVO the Ultrasonic Way

The HTC EVO features a 4G service for fast download and internet speed. This phone features 3-dimensional viewing and recording technology which does not require the use of 3-D glasses. The HTC EVO offers full flash media player support and can read HD graphics and video with its large and crisp display screen. With these jampacked features, it would be wise to subject your phone to cleaning once in a while, specifically, by using a printed circuit board (PCB) ultrasonic cleaner.

HTC EVO units can take a lot of abuse including being left out in the rain, dropped in the soup or otherwise rendered inoperable. Unless your HTC EVO is irreparably damaged, it can most likely be restored to operation in an ultrasonic printed circuit board cleaner. With the same technology used by printed circuit board manufacturers, ultrasonic circuit board cleaning quickly and safely removes contaminants from the delicate components in your HTC EVO.

Here you will learn:

  • How an Ultrasonic PCB Cleaner Works
  • How to Select and Set Up your Circuit Board Cleaner
  • How to Disassemble, Clean and Reassemble your HTC EVO

How Ultrasonic PCB Cleaners Work to Restore Your HTC EVO

A commercial ultrasonic cleaner is used in a wide range of applications to remove virtually any soil or contamination by using the power of cavitation action. This is the term used to describe the implosion of billions of minute bubbles contacting HTC EVO PCB components and surfaces. The bubbles are created by generator-powered ultrasonic transducers bonded to an ultrasonic cleaning tank and typically operate at an ultrasonic frequency of 37 to 42 kHz (37,000 to 42,000 cycles per second).

When the bubbles implode contaminants are quickly and safely removed from PCB surfaces without damaging delicate parts. So tiny are the bubbles that they penetrate minute cracks, crevices and blind holes that might lodge dried residue, dust and dirt particles. The ultrasonic PCB cleaning system will complete the job in as little as 10 to 15 minutes. And it will do it in an environmentally friendly manner because the ultrasonic circuit board cleaning solution formula is a biodegradable concentrate that minimizes disposal problems.

How to Select and Set Up your HTC EVO Circuit Board Ultrasonic PCB Cleaner

Ultrasonic PCB cleaners come in a variety of sizes from bench top units to a floor-mounted industrial ultrasonic cleaning machine, so you can select any size you need. Our most popular models for cleaning HTC EVO circuit boards are the ¾ gallon Elma EH075EL and 1½ gallon Elma EH150EL. You should select an ultrasonic PCB cleaner equipped with a frequency sweep function, such as an Elma model, to prevent damage to sensitive components during cleaning. Choose ultrasonic cleaning machines equipped with heaters to improve the ultrasonic cleaning process.

Whatever the model and size of ultrasonic circuit board cleaner you use there are steps to take before cleaning begins.

  1. Fill the ultrasonic cleaner tank to the fill line (or approximately 2/3 full) with ultrasonic cleaning solution such as Elma tec clean A1 diluted 1:20 with water.
  2. Turn on the ultrasonic cleaner, set the heater to approximately 50°C, and operate for about 30 minutes to drive off cavitation inhibiting entrained air. Degassing is complete when bubbles stop coming to the surface and must be performed every time the tank is filled with fresh circuit board cleaning solution.

How to Disassemble, Clean and Reassemble your HTC EVO

Step 1: Disassembling your HTC EVO

To start off, remove the back cover of your HTC EVO mobile phone with a plastic opening tool. This can be done by inserting the tool in the opening located on the top left side of the device. Remove the battery and memory card as well. The six screws located around your HTC EVO device need to be unscrewed before proceeding to the next step.

Once all screws are removed, run a prying plastic tool, along all the edges of the phone. This will loosen or release the clips to remove the back frame from the rest of the phone. On the left side of the phone, there are three ribbon cables holding securing the board. Release the three ribbon cables from their respective connectors by using a safe pry tool and holding back the tape.

To unlock the connectors, simply open the “jaw” connector with a prying tool and the ribbon can now be released. Do the same for the other two ribbon connectors. The circuit board is held firmly to the board by one tiny Philips screw located in the upper right corner of the device. Once this is unscrewed, the circuit board can now be easily lifted from your HTC EVO phone.

You now hold in your hand, your HTC EVO circuit board.

Congratulations! You have successfully removed your circuit board from your HTC EVO! You may now proceed with the next step.

Step 2: Cleaning the Printed Circuit Board

Set the PCB ultrasonic cleaner’s thermostat to 50°C and activate the Sweep mode. While the solution is heating, place your PCB in the basket. If you are cleaning more than one at a time take care that they do not touch each other. Once the operating temperature is reached lower the basket into the cleaning solution and set the timer for 10 minutes. Cleaning time depends on the condition of the PCBs and may have to be adjusted.

At the end of the cycle remove the components from the ultrasonic cleaning unit. If they are not clean replace them in the bath until the cleaning is complete. Then rinse them in distilled or deionized water to remove all traces of the cleaning solution and avoid water spotting. Dry them with an air blower or warm air dryer.

Safety note: DO NOT reach into an operating ultrasonic bath. Instead remove the basket if you want to inspect or rearrange the parts.

Step 3: Reassembling your HTC EVO

Return the circuit board to its original position. Screw back the tiny Philips screw in the upper right corner to secure the board. Return the three ribbon cables back into their respective connectors. This is done by inserting the cables through their jaw connectors, and once inserted, locking them in place by sliding the locks using a plastic opening tool.

Return the back frame to your device and make sure it fits accordingly. Return the six screws to their original positions located all around the edges of the phone. Insert the memory card and the battery back into the phone. Reattach the back cover and make sure it snaps in place.

Admire the piece of work you just put back together.

Voila! Start your device and your HTC EVO should be good to go.

More Operating Tips

Any contaminants that rise to the surface of the bath should be skimmed off and disposed of properly. When the circuit board cleaning solution becomes discolored or cleaning takes longer it is time to replace it. Drain the tank and dispose of the spent solution according to local regulations. Take the time to remove any material that settled to the bottom of the tank. Clean the ultrasonic washing machine using a cleaning process recommended by the manufacturer.

Questions: Visit or Contact the iUltrasonic ultrasonic cleaning experts at 973 821-4400

Disclaimer: This advice is not provided by a licensed technician. Follow at your own risk. We assume no liability for any damages caused by following the advice in this article.


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