Re: Denon 3313CI Distorted Audio FL+FR
Thanks for everyone's help and suggestions. I've been busy so not able to spend the time I'd like. I played a 1 khz audio test tone and used the oscilloscope to check the connector where the signal leaves the main digital audio/hdmi board. Putting it in multi channel direct, I get no signal on FL and FR and a nice sine wave on the center channel. Which pretty much confirms what we already knew - the problem lies in the digital audio block. It at least eliminates the possibility of a faulty connection further down the line.
Unfortunately...
ajvpb
Member
Last Activity: 06-14-2023, 04:27 PM
Joined: 04-29-2019
Location: SLC, UT
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Re: Denon 3313CI Distorted Audio FL+FR
I have considered poor connections and resoldered all of the pins where connectors are used to join boards together. Doesn't mean its not elsewhere though.
For analog, I used the "CD" input RCA connectors.
I just tested it a few more times and am now getting consistent results - When I power on the receiver and the main amp powers up/relay closes I get static through both speakers for ~15 seconds, then it abruptly stops. Additionally, in that short time I can feel the heatsink on the transistors getting warm...Leave a comment:
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Denon 3313CI Distorted Audio FL+FR
Hi all,
Hobbyist repairman here so I've reached the end of my troubleshooting abilities. The audio out of the FL+FR speakers is very distorted and almost unintelligible. BUT! That only applies to digital audio; Analog plays through just fine. The distortion carries to headphones if those are plugged in with audio from a digital source. All other speaker channels play fine regardless of digital or analog.
Previous experience with similar distorted audio has been bad resistors on the amp output - Could bad smd resistors on the hdmi board cause the same problem? My understanding... -
Re: Denon thermal shutdown help
I don't have an oscilloscope, but when I tested the ac voltage coming from the transformer it was rock steady. Would that be caused by bad caps on the voltage regulator board, after its been rectified to DC?Leave a comment:
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Re: Denon thermal shutdown help
Thanks for the suggestion, I hadn't checked that. 15.23 volts, so I don't think thats the problem but at least its ruling things out.Leave a comment:
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Denon AVR-S740H thermal shutdown help
The culprit - A new to me Denon AVR-S740H. Protection history shows 60 instances of thermal detector (A) shutdown.
Powering it up for a few minutes and it gets noticeably warm on the bottom of the case where the +12, -12, +5 voltage regulators are. After 20 minutes I would call it hot, and approaching too hot to keep your hand on that part of the case. So the thermal detection is doing its job and not tripping erroneously.
The heat is clearly coming from the small voltage regulators that use the case as a heat sink. It has a bridge rectifier that converts the AC... -
Denon receiver repair struggles
I picked up a Denon AVR-S900W with no power. Eventually I found a shorted 5339 3.3v regulator chip/ic on the hdmi board. I replaced that and was able to power on the receiver but it behaved oddly. Some of the buttons on the front wouldn't work, the volume knob wouldn't work and it didn't output any hdmi signal. I thought I may have soldered the new chip on wrong so I took it off and did some searching around. Apologies for the lack of zoom to see things more clearly.
Service manual, on the page in question:
[url]https://www.manualslib.com/manual/956886/Denon-Avr-X2100w.html?page=125#manual[/url]... -
Re: Denon AVR-S710W Protect mode
Just to give an update in case someone comes along looking for a solution of their own....
It ended up being the regulator board. Somehow I overlooked the two blown fuses on the board. Further investigation revealed someone had replaced one of the regulators on it. When they put it all back together they lost an insulating washer on the screw that holds the 7912 regulator to the chassis. The heatsink tab on the 7912 shorts to the input leg, so when it was screwed down it was shorting the 17 dc volts to ground, blowing the fuses. ...Leave a comment:
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Re: Denon AVR-S710W Protect mode
Yep, I checked protection history. 39 instances of dc protect. I'll get to the output voltages later when I get some time.Leave a comment:
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Denon AVR-S710W Protect mode
When you turn it on it will power up for a few seconds, then kicks off and the red light blinks 2x/sec.
I fixed a Denon 4200W with the same problem which turned out to be shorted transistor on the amp.
All transistors on the the 710 check out.
Service manual is here: [url]https://www.manualslib.com/manual/1484201/Denon-Avr-X1200w.html?page=2#manual[/url]
On page 99 on the service manual, on the bottom right of the first diagram of the pcb, is a connector that has all of the protection mode feeds on it. I am getting 2.2V on the ampsig_det... -
Re: Confusion about replacement HDMI port
Thanks for the confirmation!Leave a comment:
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Confusion about replacement HDMI port
Hi guys, apologies for the noob question. I have a Denon AVR-920S with a bad hdmi output port. Looks like the prior owner tried forcing it in when the alignment was off, it pushed the plastic center piece back and broke some of the connections to the board.
My struggle is in finding a replacement. The receiver supports hdmi 2.0a/hdcp 2.2. When I search digikey they only spec compliant ports they list are 1.4. I vaguely remember reading something about a licensing dispute, so that could be it. I understand hdmi 2.0 is a hardware upgrade from 1.4. Are all of those hardware changes... -
Re: New Members - please post your introductions here
Hey everyone, I'm a just a diy repair enthusiast trying to keep things out of the landfill and learn something along the wayLeave a comment:
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