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:
https://www.jestineyong.com/music-keyboard-no-power-repaired/
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Parasuraman S
December 28, 2015 at 9:13 am
Good Work! The quick trouble shooting you could do, exposes your expertise in the field, especially in an SMPS circuit. Like an experienced doctor, who diagnoses a disease on his first look, you found the root cause and rectified! Good Job! Please keep it up!
Robert Calk
December 28, 2015 at 11:37 am
Thanks, Suranga. I would use my analog VOM/ with 10K to check the optocouplers. But direct replacing like you did would be quicker.
Suranga Electronics
December 28, 2015 at 7:01 pm
thanks. MR.
Mahendra
December 28, 2015 at 1:24 pm
We have one Hand dryer machine (Make-QMAT).This machine is not working on his sensor or hand motion.That machine has been continuously on that's why he can not proper working status.Please give me suggestion on that problem waiting for your positive response.
Andre Gopee
December 28, 2015 at 2:00 pm
Good Job Suranga, Just a little note... You can check the optoisolator with you analog meter. Check Jestine E-Book and it explains how to do it. Keep up the good work.
Yogesh Panchal
December 28, 2015 at 3:25 pm
Suranga,
Thanks for sharing your tips.
Albert van Bemmelen
December 28, 2015 at 4:42 pm
Very professional Suranga, as always! Thanks.
And to other readers that want to test optocouplers and other parts the easy way. http://www.ebay.com/itm/New-IC-Tester-Multi-Use-IC-LED-Tester-Detector-IC-Model-Number-Teller-/121246388477?hash=item1c3ad910fd .Just under $25 dollar and working on a single little battery and does more than you could imagine! (very portable and also test TTL/CMOS IC's, Opamps, NE555 etc.
Mark
December 28, 2015 at 5:39 pm
Hey Suranga,
Thanks for your article. You just can't beat experience when it comes to repairs. It is good to learn all the testing methods, but as you found, some units do have consistent fault.
Keep sharing.
Amir
December 28, 2015 at 10:57 pm
Good article.
Aziz
December 29, 2015 at 5:20 am
Hi mr Suranga, thank you very much
Tito Kanshulu
December 29, 2015 at 2:29 pm
Good work Suranga. You have shown your expertise.
William
January 14, 2017 at 1:35 am
Hi suranga thanks very plenty for your help on here. please this particular type of Samsung DVD is what I'm working now. its power IC bursted and it's so bad that I can't see the number on it to replace. please what number is the power IC. Meanwhile the DVD is not booting on. it's urgent pls help. thanks.
Balaji
September 21, 2018 at 3:08 am
Hi same board and problem is power will on few minutes but player will be off
12v will not during the player off
JALA
October 26, 2018 at 8:54 pm
same board here.. first i looked and main fuse gone and i replaced it.. but no lock no power.. then i saw this article and i replaced that two parts you mentioned above.. Then power on and everything work fine almost 1 or 2 minute suddenly power off again... same problem came again and fuse is good.. please help me.. May i replace those two parts again or what?
Emgels
March 19, 2021 at 9:51 am
Buenas podrías ayudarme tengo un teatro en casa modelo HT-Z310/210 lo que nose es donde va conectado el cable q viene del botón de encendido podrías ayudarme gracias
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Hello, could you help me, I have a home theater model HT-Z310 / 210, which is not where the cable that comes from the power button is connected, could you help me thanks
Sivakanasan
November 6, 2021 at 6:35 pm
my Samsung CD player Video CD works but audio CD does not work
Please help me, sir
Please
I'm waiting for your reply