No Power In Samsung DVD Player Repaired
The complaint of this Samsung DVD player was no power. As you can see from the photo above, there was no display in the front panel.
Once the cover was opened you can see what is inside the DVD player. It consist of a mainboard, power supply board and the disc tray/lens assembly.
When I checked on the output voltages I found that the output voltages were low and fluctuates. I also did not see any bulged e-caps in the power supply board.
I had to remove the power supply board and concentrate on checking the components. It seems that most of the components were checked to be good. From experience, fluctuating output problem usually were due to bad components in the Optopisolator IC or the TL431 IC.
Since both components can’t be accurately check by using a multi-meter, i decided to direct replace the components and retest. See the two photos in the below:
Once the power was turned On, i could see the front panel display and no more power fluctuation problem. If you want to repair DVD player you can check out Humphrey’s ebook on DVD player repair HERE. If you want to become a good switch mode power supplies troubleshooter I strongly you get Jestine Yong’s SMPS repair ebook HERE.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link: