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Old 12-21-2018, 10:55 AM   #1
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Join Date: Dec 2018
City & State: Budapest
My Country: Hungary
I'm a: Knowledge Seeker
Posts: 6
Default Marantz NR1504 No sound

Hi all.

I got a used Marantz NR1504 AVR with a firmware problem. The amp was stuck in a "update failed-retry" loop, possibly failed when the owner tried to update the fw over the internet.(Marantz/Denon well known issue)

I managed to break the loop and updated the firmware from usb.
The problem is that no sound coming from the speaker nor the headphone output. I tried different versions of FWs from usb also updated over net with the latest fw. Nothing changed.

Everything works fine btw: front display menus, web GUI, relays switching during power up and when plugging headphone.

When switching to Test Tone to set up speaker levels, only the front left speaker sounds, but only the test tone nothing else.

So I started to check everything based on the service manual(btw its really well documented):
- tried to reset different times/different parts (ucom, lan contrl., stored configs etc) to rule out sw problems
- checked all power rails: within 5% all levels are ok: 12V-7V-3.3V, etc
- not really seeing visually bad components/parts
- switched to service mode where I can just operate "blocks": when the Analog signal block is selected and should the signal pass through, still silent everything
- amp board working fine when feed with ext. signal via onboard connector (every channel)
- internet radio/tuner mode when it should play something coming from the DA/DSP on the HDMI board, I got signals on DA_FR,DA_FL (CN5202) so I assume DA/DSP and main controller is OK(checked with oscope)

So I suspect the something on the analog/AV board is gone. There is only a R2A15218FP analog mux IC on it with few other parts(attached the board scheme).

The problem is that the HDMI/DSP board is on top of the AV signal board, connected with vertical PCB boards so cannot measure anything on it when powered up.(Marantz has official flex cable kits for repair, but I don't )

I already ordered a new mux chip, but I really love to hear any ideas, since I'm not a professional and never repaired things like that.
Attached Files
File Type: pdf Audio_Board_nr1504_u1b.pdf (436.2 KB, 6 views)
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