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No Power In LED TV Solved
The complaint of this UNIC LED TV was no power. So the first thing to do is to remove the cover as seen from the photo below:
Once the cover was removed, I could clearly see two important circuit boards which is the power supply and the main board.
Some repair techs just call it as motherboard.
From visual inspection I saw one of the legs of the Thermistor was broken but the bottom joints were still intact. When I checked it using Ohmmeter it showed open circuit. By right it should show resistance between 3 to 30 Ohms depending on what part number of the Thermistor you are checking. The main fuse and corresponding components were checked to be good.
Since I do not have the exact part number, I used a replacement Thermistor from a junk LED TV power board. Once the replacement Thermistor is fixed and powered On, the power supply came back and I could see the display in the TV-see the photo below:
Conclusion- If you want to be good in electronics troubleshooting, your testing components has to be strong. If you can’t accurately or do not know how to test components then chances for you to solve an electronics problem will be very slim. All professional repairers know how to test and check components and they can check it very fast. If you want to know how to check components fast, i can recommend you to get Jestine Yong’s ebook Here.
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 previous post about fixing active speaker in the below link: