LG laptop power adapter repaired. Model: 0335A1965
A dead power adapter for LG laptop was brought to my shop by a computer technician. When I powered it up, there was no standby Led light which is an indication of a dead power adapter or at least that is what I thought at the beginning.
The main problem with laptop power adapters, they are very hard to open. There are no screws to take out. The only way to open a laptop power adapter is to cut it open with a sharp knife. Just make a cut around the adapter and then the box will open exposing the inside of this power supply.
This metal shield wrapping is the ground for this power supply. You can see it soldered to the board. In order to see what inside this adapter, I need to desolder this ground area and then take the metal part off.
As I said at the beginning of this article; the power adapter was dead. It was either shorted out or something is causing that short to happen. From experience, and I have seen it so many times, the output cable that is coming out of this power adapter going to the laptop DC jack might be shorted out. This could be the cause of the LED standby light not coming on. Before I do any more checking, I need to desolder the negative and the positive terminals of the DC cable and find out.
My soldering gun was hot and ready. I desoldered this cable out. I was not really shocked to see that the moment the cable was off the board and powered up the adapter, it came back to life and the power LED light was on as well.
I tested the cable with my Fluke digital meter set to continuity testing position. The cable was actually shorted and need to be replaced. I replaced the cable and the power adapter was alive again.
Sometimes as technicians we think of the worst just because we did not see the standby come on. In this case, the cable was the main problem and it was fixed in less than ten minutes.
Another repair put a smile on the customer’s face. Mission accomplished. See you in the next repair challenge.
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. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
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