DENON AVR 2311- Power Supply Problem Rectified
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,
- 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.
- 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.
- 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
- 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.
- 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.
- Connected the SMPS board back into the AVR. Switched ON the power. Great that the power was back.
7.Next step, Checked the video and audio circuitries by connecting it TV and speakers and found all were in order.
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.
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Note: You may check out his previous post in the below links:
https://jestineyong.com/denon-dbt-1713ud-blu-ray-player-power-supply-problem-rectified/
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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.
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
Thanks,
Yes, will check for short first.
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).
jai etwaroo
November 13, 2019 at 9:04 am
Nice job Raj
beh
November 13, 2019 at 11:00 am
Congratulations.
George
November 13, 2019 at 2:29 pm
Thanks I've learned a lot from Jestine's class
S ramachandran
November 13, 2019 at 3:12 pm
Good work ..god bless you
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.
Robert Calk Jr.
November 13, 2019 at 5:41 pm
Good job, Raj!
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!
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.
Raj
November 17, 2019 at 3:27 pm
Thanks much all.. Continue learning.. will use series bulb limiter for such repairs in future..
Ashik T A
February 20, 2020 at 9:18 pm
Hi
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.
Thanks
Raj
August 5, 2020 at 9:52 pm
oh. I never come across such an issue. let me explore further. thanks
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.
Michael
May 21, 2024 at 12:00 am
Hello, My name is Michael glad you managed to fix it, i have Denon AVR-2312 which is dead, i have checked the voltages there is 5.2 volts coming from the SMPS to the HDMI board, i have seen 5v going to the input of all the DC to DC converter IC but there is no output, i have the schematic of the same, would appreciate if you could guide me on this.
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.
George Samuel
March 19, 2022 at 9:59 pm
hi.
My Denon 2311 actually has an issue with the POWER. Searching the net, I came across this!!!
We discovered that Large Capacitor is blown, exploded!! Maybe the IC next to that, some other neighboring Diodes etc too..
What Model / Capacity is that Capacitor, does that have a name, number?
Is that costly? As well as that IC - Top258MG?
Thanks again!
Warm regards,
George
Joseph Mayanja
August 25, 2022 at 9:34 pm
My denon 2311 no longer give out audio and video, it puts on no signal on TV,
Joseph Mayanja
August 25, 2022 at 9:36 pm
When look through I see a brew small I c
chien min choy
November 20, 2023 at 2:24 pm
I am glad to have read your article. I just took possession of a Marantz SR5005 receiver with the same board, same power problem. The 1.6A fused on 1st attempt. I noted that the SMPS Board was not clean. Some staining. Took out most diodes and Zener diodes and found some IN4007 faulty just like you described. Cleaned up the board, got most parts online, arrived but the TOP256 came as a PG version (7 pin), my error. Now, I wasn't so sure if the TOP258MG can be reused cos it looked ok. What is your opinion? Tqvm for your advice.