I helped a subscriber to FIX his A/C Motherboard

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In this video, we dive into electronics as we tackle a challenging task – fixing a malfunctioning A/C motherboard. Join me as I share the incredible journey of helping one of our loyal subscribers on Patreon, who reached out for assistance with their A/C unit. Throughout the video, we’ll explore the troubleshooting process, step-by-step, to identify the root cause of the issue. From diagnosing common problems to understanding the intricate components of an A/C motherboard, we leave no stone unturned in our quest to restore functionality. With detailed explanations and visual demonstrations, you’ll gain valuable insights into the inner workings of an A/C motherboard. We’ll discuss standard error codes, potential causes, and practical solutions to get your A/C unit up and running again. But that’s not all! Along the way, we’ll share some handy tips and tricks to prevent future issues and ensure optimal performance of your A/C system. Whether you’re a DIY enthusiast or simply curious about electronics, this video is packed with knowledge that will empower you to tackle similar challenges.; Join the membership for more exclusive perks. See you there.

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#ac #airconditioner #patreon #motherboard #repair #fix #help

Our subscriber, Marios Kadis asked me to help  him with a problem with his Midea mini split AC   motherboard this is our conversation. Marios:  Hello sir I have an AC idea inverter board and   the problem is that the inside fan unit is not  working can you please help me thanks. Me: Is it  

The indoor or outdoor unit fan that’s not working.  Marios: It is an indoor unit motor. Me: Did you   check if the motor is AC or DC? He answered  me and this is what I understand from his  

Answer. Marios: I checked the outdoor unit board  and its motor seems like AC I then checked the   other board DC fan is written on the board maybe  the motor is DC I have photos of the board can I  

Send you the photos. Me: Please send me clear  photos of both the indoor and outdoor control   boards from the back and front. These are the  photos of the problematic control board he emailed   me. I analyzed the images through which I found  on the board that DC fan is written but actually  

I recognize this is not a DC fan circuit but an ac  fan circuit and then I sent him this photo I told   him to check the one and two numbered markings  I marked in the photo the one number marking is  

The Darlington array the number two is the relay  I told him to check the voltages on the relay if   12 DC volts are flowing through the relay directly  then it means the relay is faulty other than this  

If 12 DC volts are not flowing through the relay  then check the Darlington array I told him to   check why the Darlington array is not working if  it is not working then replace it with a new one  

Also I told him to check the yellow capacitor  mounted beside the fan connector after this he   said to me that. Marios: I checked the relay and I  am getting 11.30 volts on it the capacitor is also  

Okay do I now change the IC only. Me: suppose  11.30 volts DC is available on the relay coil   in that case it means the relay is faulty and not  connecting with another point of the relay so you  

Have to change the relay and after changing the  relay if the fan is still not working then you   have to check 230 volts or whatever the voltages  are in your area voltages must be on the pins of  

The motor connector and if voltages are present on  the connector then the motor is faulty also check   the motor overload thermostat or check the winding  of the motor and if you have another motor replace   it with the motor installed in this control board.  Marios: I have checked the relay by removing it  

From the board it shows 12v DC and working I also  checked the other relays on board and it is the   same 11.30 volt DC and I don’t know why 11.30 DC  volts is this my problem when I put 230 AC volts  

Input on the board I have 11.30 volts DC on the  relay but I don’t have 230 volts ac on the plug   connected to the fan. Me: Okay, tell me this the  11.30 Vols DC you’re measuring are you getting it  

From Darlington array or somewhere else because  the positive DC 12 volts are coming directly to   one point of the relay but the negative point  is from the Darlington array so you will have   to check negative from Darlington array output  pin for the Relay then the relay is considered  

Good otherwise the Darlington array is faulty  where the microcontroller doesn’t give signal to   the Darlington array if there’s any protection  resistor between the microcontroller and the   Darlington array maybe any resistor is burned  between them or the value of the resistor has  

Changed to a high resistance value for example  from kilo-ohms to Mega-ohms. Marios: Hi friend   I have checked the ground from the Darlington  output for the relay and it doesn’t have voltages   only 0.719 DC volts are present. Me: it means it  has two possibilities one is that the Darlington  

Array is faulty and the other is that the  microcontroller is not providing signals to   the Darlington array check the signals with DSO  on the microcontroller if you can’t find it with   a multimeter, also you can directly change the  Darlington array IC and then check its output  

This is how you can directly understand  that the Darlington array IC is faulty or   the microcontroller has some issue, Marios: I  have ordered the IC and I will change it. Me:   okay when you change the IC then must share  its results with me thanks, by the way what  

Is the number of Darlington array installed  on this PCB CS2003A and I ordered ULN2003a   after this Marios has asked me for more help  and I helped him but you would be wondering   why I helped him I helped him because he joined  our membership on Patreon and he is a permanent  

Member and I appreciate him that he joined to  support us on Patreon so what are you waiting   for you can also join our membership on Patreon  if you need help with your appliances problem   check out the link in the description to join us  on Patreon and I will meet you there, thank you.