AC to DC charger fan repair. || Problem: high/low switch and indicator light.|| With a video tutorial.

How are you all? I hope everyone is well and healthy by the grace of God. Today I will share with you how to repair an AC to DC charger fan.

Edited with Canva.

A few days ago, a younger brother of my factory gave me a charger fan, and he said that his mother used it and this fan had been away at it for the past year. He had previously taken it to the maker, and he said that it would not work anymore and its circuit would have to be changed. The circuit of this fan model is not available in the market.

Then this charger fan was given to me to repair. Then I opened it and saw that there were a lot of problems inside, and I told him that its power line switch has many problems and it will take me some time to work on it. Let's see step by step how I repaired a charger fan that was left for a year.

Step -01

Now the charger fan that you see on my work table was given to me to repair, and there is a lot of dust on it and outside, and there are probably a lot of problems in the circuit, so let's open it and see what the condition is inside.

Step -02

You can see that after removing the body cover, there is a 6-volt transformer inside, a 6-volt battery, and a controlling circuit, and the battery that you see here has been previously modified inside this fan because this fan does not have this battery.

Step -03

Now you can see that I have opened the controlling circuit, and there is a lot of dust inside it, and this dust is completely fixed and stuck to the circuit, which was very difficult to clean, and it is very difficult to work by cleaning such a dirty controlling circuit. Even then we will see why this fan is not running.

Step -04

Now you can see that I have soaked the circuit with diesel and cleaned the dirt, and the oils have to be cleaned properly, and I have to find out the problem of its power line from the beginning.

Step -05

Now you can see that first I am checking the transformer AC output voltage through a digital multimeter because before checking a circuit I should check whether the transformer is giving power or not because the power supply indicator light of this circuit was not on. And this transformer was giving AC output voltage above 9 volts, which means the transformer was fine.

Step -06

I have connected the transformer again with the AC input voltage of the controlling circuit, and from the output of the capacitor, I have checked the DC output through a digital multimeter. You can see that here I want to output 12 volts DC, which means my circuit has power.

Step -07

Now I was checking the output voltage of the controlling circuit's indicator, and here the output voltage was showing more than four volts, which means the indicator light is broken and the line is fine here.

Step -08

Now I have replaced the previous green light, which you can see here, with this indicator green light, and after applying power to the circuit, you can see that the green light is indicating.

Step -09

And while repairing this circuit, I faced another problem, which was the high and low switch. When I was repairing the fan, my fan blade was not spinning, so here I realised that the circuit was connected but the output was not going to the fan, so I checked the switches and saw that the high and low were completely damaged, so I decided to change this switch.

Step -10

Now you can see a three-way switch in my hand. I have bought a new one and will now replace it on the circuit board.

Step -11

You can see that I have replaced the new switch on the circuit board, and some lines on the back of the circuit board are damaged, so I have bent the pins of the switch and soldered them there, and I will make jumpers where the lines are damaged.

Step -12

Now you can see that I have soldered two together at the base of each switch pin, and wherever those lines go, I have soldered them through separate jumper wires so that the connections are correct and the switch does not come off the circuit board.

Step -13

Now you can see that my fan blades are spinning, which means that the switch is fixed. After installing the new one and after applying power to the circuit, a green light is on, and the indicator light is also now fixed, and the repair work of this fan is now complete.

Step -14

Now I have removed the net cover and the inner covers of this fan because there was a lot of dust inside it, and I will clean all of them now.

Step -15

Now you can see that I have cleaned the fan blades and mesh covers with soapy water and dried them in the sun. Now I will refit them.

Step -16

Now you can see that after cleaning the fan, the blades and mesh covers are all put back as before, and now it looks very clean and attractive. It is not clear that it was an old fan that was thrown away for a year.

Step -17

Now I have completely cleaned the charger, cleaned the dust, changed the switch, cancelled the indicator, put a new one in and made the connections nicely. Now it is complete for service.

Video Tutorial: To better understand the practical part of this tutorial, you can watch the video below.

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🟩 Thank you for reading my post and giving your valuable time. Stay well and stay healthy. God bless you. 🟩

Photography Details	📱 Device: Walton Xanon90	📍 Location: Narayanganj, Bangladesh	📷 Captured By: @imranhassan