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DENON AVR 2311- Power Supply Problem Rectified

By on November 12, 2019
denon amplifier repair












Good Morning,

I got this Denon AVR which could not power up recently.  With a hope to apply my troubleshooting techniques learnt from Mr. Jestine’s class,

  1. I opened up the unit and found that the SMPS board was mounted vertically on the left side. Had a look at the accessible areas of the various boards and found that they are clean without any visible burnt marks, bulging caps etc.

singapore repair denon amplifier

               singaporean repair and fix denon amplifier

  1. Without removing the whole SMPS board, I managed to remove and checked only the 2-fuses on the board. It was found that one (T1.6A 250V) of the fuses had been blown. Since I got a spare fuse, replaced the fuse and switched ON the power. Oops! The same fuse was blown again.
  2. To extend the troubleshooting further, I removed the SMPS board and conducted visual check on the components first. Found that a switcher IC (which could not seen initially due to vertical position of board) TOP258MG was burnt as well. Also, checked all other components one by one and found that 2-diodes (IN 4007) were faulty. Rest of the components were in order

how to repair denon amplifier no power

how to fix denon amplifier no power


  1. Replaced all 6 diodes including the 2-faulty ones, the burnt IC and the blown fuse with the new ones. Removal of IC was a bit challenging as there were a few SMD components nearby. Used Kapton tape to protect those SMD components and replaced the IC safely.

singaporean repaired amplifier

singaporean fixed amplifier


  1. Connected the power supply to the SMPS board alone. Checked the voltage at main filter cap using DMM and found that voltage was in normal range. Good to see that the fuse was not blown any more.

  1. Connected the SMPS board back into the AVR. Switched ON the power. Great that the power was back.

fixing denon amplifier


        7.Next step, Checked the video and audio circuitries by connecting it TV and speakers and found               all were in order.

how a singaporean fix denon amplifer with no power symptom

Wow!!!. The Denon AVR2311 is working flawlessly. I am so happy that I am able to apply my learning on SMPS repairs from Mr. Jestine’s class.


Thanks much Mr Jestine. You are The Great Guru.

This article was prepared and shared by Raj, an electronics hobbyist from Singapore. He has done Masters in Industrial Safety Engineering and Degree in Mechanical Engineering. Currently, he is working as a Safety Professional in Singapore.  Although he is with mechanical background, his hobby is on consumer electronics stuffs especially on home theatre systems, amplifiers and speakers.

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:




  1. Parasuraman S

    November 12, 2019 at 9:27 pm

    Good job there! You fixed a bit touch problems that ordinary technicians would not venture to do.

    • Raj

      November 12, 2019 at 11:03 pm

      Thanks Sir.. Learnings from Jestine’s class helped me a lot.

  2. Devon Wilson

    November 12, 2019 at 11:30 pm

    Great job in getting the amplifier up a d running again. Great. You will no doubt become better at this. In the future, when you find a bad fuse, you should always check for shorts before Installing the replacement.

    • Raj

      November 13, 2019 at 8:23 am

      Yes, will check for short first.

  3. Albert van Bemmelen

    November 13, 2019 at 12:09 am

    Good job in fixing the Denon unit! Although you used the maybe the fuse was bad trick first instead of a light bulb in serie (LOL).

  4. jai etwaroo

    November 13, 2019 at 9:04 am

    Nice job Raj

  5. beh

    November 13, 2019 at 11:00 am


  6. George

    November 13, 2019 at 2:29 pm

    Thanks I've learned a lot from Jestine's class

  7. S ramachandran

    November 13, 2019 at 3:12 pm

    Good work ..god bless you

  8. Justice

    November 13, 2019 at 4:00 pm

    Exciting to learn from the new kid in the family though you are a guru in mechanical spectrum. Very interesting and I was following each an every step of your explanation--good job Raj.

  9. Robert Calk Jr.

    November 13, 2019 at 5:41 pm

    Good job, Raj!

  10. Gassan

    November 14, 2019 at 12:36 pm

    A detailed presentation. Loved the step by step approach of explaining! Wish you success as a hobbyist!

  11. Yogesh Panchal

    November 14, 2019 at 3:18 pm

    Raj, Good Job!
    For safer side always use series bulb limiter for this type of fault finding & repair.

  12. Raj

    November 17, 2019 at 3:27 pm

    Thanks much all.. Continue learning.. will use series bulb limiter for such repairs in future..

  13. Ashik T A

    February 20, 2020 at 9:18 pm


    I have DENON AVR 1311 Red light blinks when switching on the amplifier and after 3 attempts it will go green and start working.

    What could be the reason. and how it can be fixed.


    • Raj

      August 5, 2020 at 9:52 pm

      oh. I never come across such an issue. let me explore further. thanks

  14. Andrew mabuza

    May 4, 2020 at 2:06 pm

    Hi Raj,

    Thank you so much for the article. I am based in South Africa and my AVR is experiencing the same problem and we do not have parts suppliers this side. I need the IC. Do you know where I can order this part for my AVR?

    Your assistance will be higly appreciated

    • Raj

      August 5, 2020 at 9:49 pm

      Sorry for late reply.. Tied up with Covid measures at office. You mean IC: TOP258MG? I bought it locally in Singapore. You shall try at aliexpress.

  15. Nori

    March 20, 2021 at 8:59 am

    Hi Raj,
    I have same issue on AVR-2311. My case is zener diode MTZJ22B were broken instead. But I can find same device in Singapore. Do you have any idea how to find these devices? I couldn't find it in Sim Lim.


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