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How To Repair Tadiran Air Cond PCB Board
In my area, especially in this time of the year, we usually get alot heat waves. People use their air condition a lot and many people who do not have air condition, will buy and install one. Facing such heat waves every year, will put a big load on old air conditions.
My friend, the air condition technician, brought me another air condition board for repair. It is completely dead, my favorite kind of repair cases.
I powered it up and I did not see any sign of life in this board. I did a fast check up on measuring AC voltage, checking the fuse and it seems like everything was in top shape.
It was very easy to open the case, two screws off and I could see the down side board.
I checked for cold soldering joints, any loose connection, again, everything was in top shape. This is the top side of the board and for the naked eye, everything was in order. I checked voltages at the main capacitor, there were 24 DC volts but for some reason, there was no relay click to indicate a live board.
I took the relay off and applied 24 DC power to it, it clicked and there was a continuity reading between the two pins. What could be the problem? So far, I could not see anything wrong with it yet, it does not work. I was getting power all the way to the secondary section of the power supply. Anything beyond that point was completely dead.
As you can see, I gave it a try and replaced the main capacitors although, it tested fine. The moment I did that, I started seeing the LED light comes on for a little bit then it fades away. That was a step forward and I started getting more hope to fix this complex board. I started checking the SMD parts in the lower side of the board and all checked fine. An idea came to my head and I thought of reflowing the entire SMD bard near the main IC.
There is no name on this integrated circuit and even if it was the main problem, I will not be able to replace the part. So, here it goes.
This is the flux that I use for re-flowing the SMD parts. I used this stuff a lot when I repair Iphone boards. This stuff is great but be careful when using it. You need to be in a good ventilated area to use that. After I was done, I let the board cool for a while because it was really hot. I plugged it in and to my surprise, it really worked.
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.
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