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Power IC and Zener Diode Shorted in DVD Player Repaired
The complaint of this LG DVD receiver and player with model HT355SD was no power. No power symptom can be caused by many factors such as open main fuse, bad on/off switch, bad power components, shorted mainboard and etc.
I had to open up the casing (see the photo below) in order to see if there is any components in the power section that had burnt and etc. The main fuse was good and no burnt components.
What I saw was ants nest surrounding the legs of the power IC and power FET. The circuit track of the power IC was corroded and this could be the problem of no power symptom. See the three photos below:
As usual, just before I replace the components I will check the surrounding components and I found a zener diode shorted. If you would like to learn how to check components like a professional you can get Jestine’s Ebook on testing components. This ebook is a must for all beginners.
The shorted zener diode
Next I cleaned the board fully and bought the new components-one zener diode and power ICE3BR4765C and fixed into the board and power On.
The power came back and worked beautifully. It was an easy job and the parts also not expensive.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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