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Hello to all repair enthusiasts, I am Lao Zhou, and I have been engaged in electronic repair for 15 years. Today, let’s talk about the waterproof modification of the smart toilet cover circuit board. Speaking of this, I remember a customer last week whose smart toilet cover suddenly stopped working. Upon opening it, I found that the circuit board was completely soaked! This situation is quite common, but with a little modification, we can greatly extend the lifespan of the toilet cover.
Why do we need waterproof treatment?
The working environment of a smart toilet cover is humid, and the circuit board is often exposed to high humidity, which easily leads to corrosion and short circuits. It’s just like putting your phone in the bathroom; over time, it will definitely have problems. It’s necessary to give the circuit board a “raincoat”.
Choosing the right three-proof paint
There are many types of three-proof paint on the market, and the key points for selection are:
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Good insulation
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Moderate viscosity
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High-temperature resistance
I often use acrylic three-proof paint, which acts like a waterproof coat for the circuit board, being both breathable and waterproof, and very cost-effective.
Spraying process
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Cleaning: Wipe the circuit board with anhydrous ethanol to remove grease and dust. This step cannot be careless, just like disinfecting a patient before surgery.
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Masking: Use high-temperature tape to cover areas that do not need spraying, such as sockets and switches. This is like using newspaper to cover areas you don’t want to get paint on while painting.
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Spraying:
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Maintain a distance of 20-30cm
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At a 45° angle to the board surface
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Move laterally at a constant speed, evenly like watering flowers
Note: Don’t spray too thick, as it will affect heat dissipation. A thin layer is enough, just like brushing a layer of syrup on a cake.
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Curing: Let it air dry naturally at room temperature for 24 hours. If you need to use it urgently, you can bake it in the oven at 60°C for 1 hour.
Leakage detection
After the modification is completed, be sure to perform leakage detection. I use a megohmmeter, setting it to 500V, to measure the insulation resistance between the circuit board and the metal shell. The normal value should be above 100MΩ. If it is lower than this value, there may be areas that were not sprayed or cracks.
Once I encountered a situation where the resistance value was only 10MΩ, and upon careful inspection, I found that a corner had not been sprayed. After fixing that, everything was fine.
Extended lifespan
After the three-proof paint treatment, the lifespan of the smart toilet cover can be extended from the original 2-3 years to 6-8 years. This is equivalent to giving the circuit board an anti-corrosion injection, significantly enhancing its moisture resistance.
Precautions
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Ventilation: Spray in a ventilated area, as the smell of three-proof paint is not pleasant.
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Masking: Be especially careful to properly mask the heating elements, as it will affect heat dissipation.
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Thickness: Don’t be greedy; a thin layer is sufficient. Too thick will actually affect the heat dissipation of the components.
Practical advice
Find a discarded circuit board to practice on first. In the beginning, you might spray unevenly, but with more practice, it will improve. Remember, spraying should be gentle and even, like writing with a brush.
This simple modification not only makes your smart toilet cover more durable but also saves a lot on repair costs. Feel free to ask me any questions, and let’s learn and improve together!
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