Denon AVR-X3600H No sound even to pre outs in direct analog mode. Help please!

[FuzzyOwl]

Update replaced two op amps still not working 😔 any ideas?

[FuzzyOwl]

I've measured the forward voltage drop of all 13 of the op amps most of them seem too high but the zone 2 ones seem okay which would explain why zone 2 works also I've measured the muting transistors all of them seem too high even zone 2. Page 24 shows 7 of the op amps (njm8080g) and the muting transistors (inc2002ac1) and page 27 shows the other 6 op amps.


Any idea what could've caused this? If I replace just the op amps would it work?


U4211: blank

U4212: different amp but .6

U4210: .6 main l r so idk

U4209: .6

U4205: .6

U4206: 1.1

U4207: 1.1




Side board




U4200: 1.1

U4201: one channel .6 one 1.1

U4202: 1.1

U4203: 1.1

U4215: 1.1

U4213: 1.1

U4214: 1.1


all muting transistors 1.3

[FuzzyOwl]

Or could it be operational amplifiers?

[FuzzyOwl]

Just going through some steps that I've also followed for my own issue, any difference between digital/analog sources? Do the relays click on/off like they should (eg by pressing mute)? Does passing the analog input signal through the DSP produce audio?

Update: When I plug headphones in and turn the sound all the way up I get very faint sound through them only on the phono input though which has an extra pre amplifier circuit. Now I’m looking into it being some sort of bad capacitor on a pre amplification circuit. Can anyone help isolate. page 24 on the service manual shows it I think but I don’t really know what I’m looking at.

[BigOof]

Just going through some steps that I've also followed for my own issue, any difference between digital/analog sources? Do the relays click on/off like they should (eg by pressing mute)? Does passing the analog input signal through the DSP produce audio?

[FuzzyOwl]

Have you checked the settings to see if the zones are configured properly? Have you performed a factory reset yet?

I’ve factory reset. For now I’m just trying to pass stereo audio through so I don’t think the zones matter other than me being able to get audio through zone 2

[BigOof]

Have you checked the settings to see if the zones are configured properly? Have you performed a factory reset yet?

[FuzzyOwl]

Replaced nju72343 didn’t fix it 😔 any ideas?

[FuzzyOwl]

Update: I got sound out the amplifier using 7.1ch+zone 2 mode with speakers hooked up to height 2 channels

[FuzzyOwl]

Also does anyone know how to get access to the firmware the service manual says to download it from the on line parts list sdi but it requires login. In particular I want the audio pld 5M570ZF256C5N firmware

https://dmedia.soundunited.com/documents/details/25940

[FuzzyOwl]

Hi, I have a Denon AVR-X3600H I'm trying to repair. I have no electronics repair experience but I have a multimeter, service manual and a will to fix it (https://cdn.badcaps-static.com/pdfs/...229fd29233.pdf)

Everything seems to work except for no sound even through the pre outs. However I will get sound using Zone 2 pre outs.

Only digital symptom I can tell is it will soft lock when in the Speakers/Test Tone menu and be unable to adjust +/- db during the test tone.

I've followed the trouble shooting guide, audio check (page 83 in the manual) booted it in service path check mode 1. Analog direct but still no sound.

Looking at the analog audio diagram (page 49) there's only two chips between analog in and pre outs. Input selector (NJU72750) and volume control (NJU72343) however there's two sets of them.

Both input selectors (NJU72750) seem to be good because I can change sources (even digital ones) fine in zone 2

I'm thinking something is wrong with the volume control chips (NJU72343) but it seems unlikely to me that both would die at the same time. I've checked the voltage regulator that powers them and its good, although I haven't checked it at the chip. Its not accessible without taking the essentially the whole thing apart. Also input selectors (NJU72750) are powered by the same rail so I think its fine.

Looking at the schematic (page 24) The only other thing I could think could be wrong is some how the the data connection MVOL_DATA is not making it to the chips. Anyway to test this?

I'm thinking of ordering volume control chips NJU72343 for about $18 delivered from digikey and finding and paying some one to solder them. Does that sound like a good plan?

(Also is there any way to route zone 2 through the third input selector and amplifier to see if those are still good?)

Any help is appreciated Thanks in advance.