An air condition technician brought this board to my shop for repair. He usually comes into my shop and start to explain the problem. He has a high tone of voice and the whole area could hear him talking about that board. Anyways, he is a good guy and he always brings tones of things to fix. Check out the board.

air cond board repair

This is the second board I have repaired that comes from the same air condition model. This has a different problem and with that comes different repair techniques. This board was dead.




Plug in power and I could hear a faint click of a relay clicking but nothing happens. The lights on the board come on but flickering and when I checked the board that has all the LED lights, look what I found.

how to fix air cond board

It was dirty and corroded and later on I found out that water came on that board and was not cleaned. I have to clean that board and re solder all the soldering joints. I plugged it in power and all the light come on and steady this time. That is a one step further to fixing this board. Here is the board from the other side.

how to repair air cond board

Now that I am done with this board, my focus shifted to the main board. As I said before, I could hear a relay clicking but nothing is happening. I started checking for water damage on that board and I found something. Look at this

how to fix and repair air cond board

It was a 3.15 fuse and it was intact but I went the extra mile and replaced that fuse. I also cleaned the fuse holder on that board. I am pretty sure that was not the issue with this board because it was doing its job in delivering power.

fixing aircond board

Look at this dirty fuse holder. It was nasty and corroded. I replaced that holder with a brand new one.




Since I have repaired this kind of air condition boards before, and the main relay was not clicking. The relay needs 24 volts to come on to transfer 220 AC volts to the main pump. I traced that voltage source and it was coming from these two integrated circuits.

how to repair and fix air cond board

As you can see, it is TD62003AF. They were also corroded and needed re soldering.

These  IC’s were giving output of 15 volts each that go directly to the coil pins on that main relay. But for some reason these voltages were not reaching the coil pins. Once I cleaning and re soldered all the pins of both IC’s I could read 30 DC volts total output to the pin of the relay. I clicked with the remote control and guess what, the relay clicked and 220 AC volts came out. Sorry I could not take a photo of that because the board was hanging down from the AC unit in the customer’s house. The Air conditioned came on and it was cool and breezy.

Mission Accomplished.

waleed

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.




P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/no-picture-in-vision-net-satellite-receiver-repaired

About

Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com

25 comments on “How To Repair A Dead Air Condition Circuit Board

  1. Parasuraman says:

    Excellent!

    1. alfie peralta says:

      simple and nice

  2. Albert van Bemmelen says:

    You are a very busy guy Waleed! Good job done! The TD62003AF you mentioned is a 7CH DARLINGTON SINK DRIVER Toshiba IC.

  3. joop says:

    good job sir,
    thanks for sharing.

  4. Shawn lawrence says:

    I am an air condition tech. I need to be able to repair these boards to include inverter units. Could you give detailed step by step instructions how to do repairs. Like how to trace and diagnose problems.

      1. ramexchand says:

        you need to become familier with the circuit board, components,the role played by the components in a paticular circuit where they are employed,like bridge rectifiers will only be used in mains power supply to convert ac input[sine wave]to dc voltage,capacitors for filtering,resiervoir etc,resisistors for voltage and current dropsevery cir board has itsown layout andsome times marked with white lines to show which block is playing what role.if u r following these simple rules will make u analize and to understand any circuit or board layout to further step.

  5. Humberto Rodriguez says:

    Good repair. Congrats.

  6. Jacob says:

    I salute you (bwana) means boss

  7. Jacob says:

    Thanks for this very important teaching

    1. Nasser Mohammed weyi says:

      Good repair steps awknowledged.thanks

  8. Khan ubed says:

    Sir what’s mean oc light and what’s mean that

  9. Chaman lal says:

    Sir very nice. Thanks. Sir I want to purchase AC repair tv repair book. How it possible.

    1. admin says:

      Hi Chaman,

      You can visit this link for more info:

      http://www.electronicrepairguide.com/crt-tv-repair-ebook.html

      Jestine

  10. muwanguzi says:

    Thanks brother for your devotion in giving us that knowledge

  11. jim says:

    Thanks its for teaching us

  12. Muhammad Ashfaq says:

    AoA dear Waleed ur work is likely good

  13. Gikunda joseph says:

    thanks for sharing am encouraged

  14. peter says:

    Nice and Satisfying

  15. jai Etwaroo says:

    Good job

  16. RAJATSUBHRA BANERJEE says:

    Very good

  17. Mike Retz says:

    Hi. Enjoy your troubleshooting articles..a++ have you ever done any troubleshooting on mini split air conditioners or heat pumps? Looking for information on boards used inside WYS pioneer heat pump wys indoor and condensors. Thanks and have a great day..

  18. Karl-Heinz Laufer says:

    Meine Klimaanlage schalte sich nicht mehr ein Klimatechnike kann die Boards nicht Reb.
    Ich suche Hilfe für Reb.
    =====================================
    My air conditioner won’t turn on Air conditioning technology can’t reb the boards.
    I’m looking for help for Reb.

  19. Jaroslav Sianta says:

    Thank You for sending informations. Now I´m repairing board of air condition of my son and it probably will be usefull for me.

  20. SALVADOR FACTOR LO says:

    thank you for very fine conversation my students learn a lot with your topic GOD BLESSED YOU

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