Don't Miss

Voltage Surge Shorted Two Mosfets And Blew The Fuse In Samsung LED TV LA32D451G3

By on September 23, 2023
samsung led tv repair

how to fix samsung led tv

This TV was brought from my neighborhood with the complaint that it was found dead when switched on one day. After opening the back cover and subjecting it to a thorough cleaning, I looked for the problem creator in the power supply area.

There was no output, which led me to trace a blown fuse. Further checking revealed dead short of two Mosfets that drove the back light. I removed the connector of backlight and checked the LEDs using my LED tester and found it to be working.

how to repair samsung led tv

The Mosfet number used was 5N50 (5A, 500V). I used 6N90 (6A, 900V) instead and wired it providing heat zincs and fixing it on the metal chassis. Then when I powered the board after replacing the fuse, the output was present.

Then connected the mother board and found the TV to be working well, upon which I closed the back cover and allowed the TV to be on for several hours before delivering it to the customer. Mission accomplished and satisfaction got added to the collection with pleasure!

fixing samsung led tv


This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S-If you enjoyed reading this, 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!

You may check on his previous article on Amusing Self-Service Of OSRAM LED Bulb Model R18NBB



  1. Albert van Bemmelen

    September 23, 2023 at 1:22 pm

    You not only fixed this Samsung TV but also made an upgrade by replacing the 2 previously smaller smd mosfets by 2 bigger decently cooled mosfets too!
    With also better max voltage/current specs!

    • Parasuraman S

      September 23, 2023 at 1:44 pm

      Many thanks, dear, for your expert observation and comments!

      • James

        September 23, 2023 at 7:00 pm

        Thank you parashuram sir congratulations you're experience in valve Radio system

        • Parasuraman S

          September 23, 2023 at 11:17 pm

          Many thanks, dear James!

  2. Waleed Rishmawi

    September 23, 2023 at 1:26 pm

    a very good job my friend. where do you find such mosfets? if you have the link please share it. thanks and have a blessed day

    • Parasuraman S

      September 23, 2023 at 1:44 pm

      These are locally available in the electronic shops. Many thanks.

  3. Yogesh Panchal

    September 23, 2023 at 3:36 pm

    Good fix! Sir

    • Parasuraman S

      September 23, 2023 at 11:17 pm


  4. Imoudu.O

    September 24, 2023 at 2:18 am

    It's always difficult in my area to get those small fets to purchase,I never thought a big fet can be used to replace small one, now that I know, l gonna try it some day.Thanks for sharing sir

    • Parasuraman S

      September 24, 2023 at 12:22 pm

      It's not the size what matters when we replace components. It's the specification. Many thanks for your comments!


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.