Blinking Stand By LED Light In LED TV Repaired
A customer sent to me this Samsung 22″ LED TV with the complaint of front red light power LED blinks. The usual cause of power LED blinking are output voltages from the power supply fluctuates or improper, bad memory ICs in the mainboard or the DC supply voltage to the memory ICs was improper.
I took out the cover and saw the power supply/LED Driver and the mainboard-see the photos below:
I flipped the power/LED Driver board to look at the ICs.
I saw the LED driver IC and the 5 volt voltage regulator IC.
For your information, usually TV power board has a small chart of the output voltages and signal printed on it -see the photo below:
You can use the information provided by the chart to do your troubleshooting work.
I turned on the power and measure the 5 volt IC output and it was showing 0 volt-see the photo below:
I soldered out the defective IC and replaced it with a good one and turned the power On again.
Look at the TV display. I was satisfied with the work and could charge my customer to earn some profits.
Conclusion- In the above case, the repair was quite easy. It was just a bad 5 volt regulator IC. Assuming if the IC is good then I may need to start to troubleshoot on the mainboard especially the memory ICs. Ok that’s all for it and will see you again next time. All the best.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous post in the below links:
https://jestineyong.com/no-tuning-problem-in-led-tv-repaired/
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Parasuraman S
November 20, 2018 at 2:21 pm
As usual very professional direct solution! Well done!
Robert Calk Jr.
November 20, 2018 at 2:35 pm
Good job, Suranga. I will bet that the customer is happy that they took it to you for repair rather than throwing it away and buying a new TV!
Albert van Bemmelen
November 20, 2018 at 3:25 pm
Nice repair with professional result! Good photos too but replacement 5V regulator type sadly was not visible.
Andre Gopee
November 20, 2018 at 5:53 pm
Great job, well explained and trouble shooting skills.
beh
November 20, 2018 at 7:32 pm
Fast and easy .thanks SURANGA.
Gift Maverevedze
November 21, 2018 at 6:45 pm
Got the same type of t.v but not showing pictures but can speak and u can see the pictures when u use a torch backlights problem which part should l replace there
Gift Maverevedze
November 21, 2018 at 7:07 pm
Hie got same type of t.v speaking but not showing pictures so u can see the pictures using a torch which part should l remove.
muiddin
November 27, 2018 at 4:10 am
very helpful.
Thank you sir
Yogesh Panchal
December 4, 2018 at 9:19 pm
Good job! Suranga,
now a days finding this type of IC is not economical.
Rizwan Khan
March 27, 2019 at 8:15 pm
I'm also facing a problem with my old tv which i bought few weeks ago. It is continuously showing blinker on the IR sensor of remote and i'm unable to use it. Also suggest which is the best smart tv to buy? it should be a reliable one I must say.