Thank you soooo much, you are a life saver!
Will flash the IC first thing tomorrow and report back.

C1604 including all other 30 something electrolytic capacitors are replaced....

Ouch, is that first picture the current condition of the board or an old one to illustrate the damage?
If it still looks like that I would give it a careful but proper cleaning and check for any shorted/missing components. It could be that some of that dirt moved when you took it apart and now there is a short somewhere causing this issue.

Hi all,

I picked up a Marantz NR1501 that the seller said did not produce any audio, but was starting up just like normal. This was indeed the case and the hunt for damaged components started.
After confirming all voltages and replacing all caps on this godforsaken HDMI-board I finally got sound from the AUX input, but all digital inputs are still dead.

The service menu shows no DSP version so I desoldered IC1604 that should have the serial flash DSP firmware on it and made two dumps that turned out identical.
The content of these seems to be useless as far...

Hi all,

Engineer that developed a bad habit/hobby of purchasing non-functional electronic devices to see if I can fix them, just for the fun of it. This seems like the place to be for support so here I am! 😊