MBRF10200CT Dual Schottky Diode Shorted In LED TV Repaired
This Innovex 24″ LED TV came in with the complaint of no power symptom. For your information a no power symptom can be caused by either the primary or secondary side of power supply or even both sides. The first thing to check obviously is the main fuse and it was found to be good.
Since the main fuse was good so I need to power up and check on the secondary side to see if there is any DC voltage and it was totally zero volt.
Below are the photos of the power supply and main board and the photo of meter showing zero volt when checked on the secondary side.
Before I further check on other components in the power supply section, I noticed there were dry joints at the transformer pins.
I applied fresh solder to those joints and powered it up and the result was still the same.
I proceeded to check the components at the secondary side first before checking the primary side and I did not expect one of the 3 legged Schottky diode showed shorted reading on board. I took the diode out and checked it off board and it was still shorted.
The Schottky diode part number was MBRF10200CT and you can check on the next photo for the datasheet. The TV was repaired by replacing only the Schottky diode and two filter capacitors.
Please click on the above photo to read the MBRF10200CT Schottky Diode Datasheet
Conclusion- Assuming if after the replacement of the Schottky diode and still not be able to power up, guess I have to check on the primary section such as to see if there is any VCC to the Power IC, replace power IC, check power FET and etc. Actually troubleshooting Consumer electronics switch mode power supplies (SMPS) is not that difficult if you could follow Jestine Yong’s way where he had documented troubleshooting SMPS the easy ways in his ebook here.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.
P.S- If you enjoyed reading the above article, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
Note: You may check out his previous post in the below links: