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Power Blinks In LG LED TV Repaired

By Jestine Yong on February 22, 2019

This 24″ LG LED TV came in with the complaint of power blinks. Power blinks problem can be caused by bad power supply or the mainboard itself. If the mainboard is receiving good DC supply voltages then can ignore the power supply.

In this case, the external power supply was tested good (19.06 VDC) but sometimes the voltage can be lowered due to the power supply itself have problem (can’t sustain the load draw) or the mainboard is drawing too much current.

In the below example, you can see that the moment the power supply was connected, the supply DC voltage dropped from 19.06 to 15.18 and finally 9.32 volt. This is very abnormal.

By right it should drop slightly and not too much. I did not suspect the power supply fault because I have a spare power supply to confirm that it was working fine.

Since the problem now is in the mainboard, the first thing I do was to check the components in the voltage regulator circuit. I did not find any bad components except one which was the SMD electrolytic capacitor that is rated 68uf 35 volt.

It was leaked and have low resistance. This is the main cause that had pulled the power supply DC voltage down!

I took a normal electrolytic capacitor (100uf 63 Volt) just to test it out to see if the TV will works again.

Guess what? The TV came back to life again.

Conclusion- This kind of problem can happen in any electronic equipment. One good example is the laptop. By referring to my article, at least you will have some ideas on how to troubleshoot and repair it. Ok will see you again-thanks.

This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

Click HERE to check out Humphreys ebook in LCD/LED TV Repair

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Note: You may check out his previous post in the below links:

https://jestineyong.com/shorted-led-driver-mosfet-in-hisense-led-tv-repaired/

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LED TV Repair

7 Comments

Albert van Bemmelen

February 22, 2019 at 4:38 pm

Good job. The bad 68uF 35V SMD e-cap probably also could have been found by using a higher current 19V DC power supply on the TV's input. Doing so that bad e-cap likely would feel very hot compared to all other components or would go up in smoke. That way presenting itself without much difficulty.

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mahmoud-tajpour

February 23, 2019 at 5:47 am

Hi dear Bandara i think this is the best work that you do .

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Robert Calk Jr.

February 23, 2019 at 6:35 am

Good job, Suranga.

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Parasuraman S

February 23, 2019 at 4:16 pm

Excellent professional service as usual!

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Hakan

February 24, 2019 at 3:16 am

I have a old satellite receiver(sd dvb-s) and when try to turn on,the led is not on about 10-15 minutes and then turns on as yellow and the output voltages from powersupply is normal,no signal from bsbe1-701a tuner.what tuner can I use instead of this tuner?bsbe2-401a is possible instead of?it is impossible to find dvb-s tuner on Aliexpress ,just there is only Dreambox tuners...

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Humberto

February 27, 2019 at 1:10 am

Good repair, Suranga.

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Ivan

July 9, 2021 at 3:06 pm

Thanks for the lesson sir

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