CT2700 is a first gen SB16 card and it comes up with almost no results in a google search.

See here for some possible fixes as it is almost the same as the CT1740 except for the DSP version and the CD controller:
Creative sound blaster 16 CT1740 very low sound

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

OP stated they tried in in two different systems.

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

Why do you highly doubt? 😀
I've repaired quite a few damaged SB16s (with similar symptoms), which is why I'm asking.

bloodem wrote on 2021-11-23, 06:15:

Why do you highly doubt? 😀
I've repaired quite a few damaged SB16s (with similar symptoms), which is why I'm asking.

If you had "repaired quite a few damaged SB16s " why are are more interested in my doubts than in helping the OP with their sound card in the first place?

I have the feeling this is the card you bought from me recently.
If that's the case - it worked fine 2-3 weeks ago, but looks like it's health deteriorated on the way to you.
I reimbursed you already, but still hope you manage to fix it.
Fingers crossed.

pshipkov wrote on 2021-11-23, 09:40:

I have the feeling this is the card you bought from me recently. If that's the case - it worked fine 2-3 weeks ago, but looks li […]
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I have the feeling this is the card you bought from me recently.
If that's the case - it worked fine 2-3 weeks ago, but looks like it's health deteriorated on the way to you.
I reimbursed you already, but still hope you manage to fix it.
Fingers crossed.

Small world!

Well, old card, old solder, maybe some joints cracked during transit. It was in a static bag, so I doubt it was ESD. A reflow of the larger components wouldn't hurt.

bloodem wrote on 2021-11-23, 06:15:

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

Why do you highly doubt? 😀
I've repaired quite a few damaged SB16s (with similar symptoms), which is why I'm asking.

Not exactly the reply I was looking for. But, since you're here, can you list a few of the failure modes on your cards and the solutions? I do have a garage full of test equipment, less a logic analyzer.

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

Yes, I tried DIAGNOSE as well - the digital sounds test results in the same symptoms. It's definitely a bad card, not my first rodeo.

trozx wrote on 2021-11-23, 13:51:

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

Yes, I tried DIAGNOSE as well - the digital sounds test results in the same symptoms. It's definitely a bad card, not my first rodeo.

My instruction stresses on another motherboard and secondly with DIAGNOSE or whatever. Was it on the same motherboard?

georgel wrote on 2021-11-23, 14:06:

trozx wrote on 2021-11-23, 13:51:

georgel wrote on 2021-11-23, 05:22:

First try on another motherboard with Creative's DIAGNOSE utility and then make conclusions that you SB is faulty which I highly doubt.

Yes, I tried DIAGNOSE as well - the digital sounds test results in the same symptoms. It's definitely a bad card, not my first rodeo.

My instruction stresses on another motherboard and secondly with DIAGNOSE or whatever. Was it on the same motherboard?

Two different motherboards, same problem.

Which DIAGNOSE function(s) specifically fail?

georgel wrote on 2021-11-23, 14:19:

Which DIAGNOSE function(s) specifically fail?

All digital sounds fail - 8bit and 16bit - silence or faint beeping is typical.

trozx wrote on 2021-11-23, 13:48:

Not exactly the reply I was looking for. But, since you're here, can you list a few of the failure modes on your cards and the solutions? I do have a garage full of test equipment, less a logic analyzer.

Sorry, I actually had a very busy day and didn't even completely read the initial question. However georgel's comment stood out to me (being shorter). 😁
The most common issues that I saw with these SB 16 cards are related to faulty voltage regulators, faulty oscillators, or bad capacitors (more rare, but possible). I've never had one with a faulty chip (like a faulty DSP), but that doesn't mean it's not also a possibility.

bloodem wrote on 2021-11-23, 18:05:

trozx wrote on 2021-11-23, 13:48:

Not exactly the reply I was looking for. But, since you're here, can you list a few of the failure modes on your cards and the solutions? I do have a garage full of test equipment, less a logic analyzer.

Sorry, I actually had a very busy day and didn't even completely read the initial question. However georgel's comment stood out to me (being shorter). 😁
The most common issues that I saw with these SB 16 cards are related to faulty voltage regulators, faulty oscillators, or bad capacitors (more rare, but possible). I've never had one with a faulty chip (like a faulty DSP), but that doesn't mean it's not also a possibility.

Thanks!

When you say faulty regulators, do you mean n0 voltage output, unstable voltage, or noisy output? -- all of the above? In my case I'm seeing a solid 9 and 5 V output on my DMM, but I have not scoped it yet.

You're welcome!
If you do see the 9/5V output then they are most likely fine (although an oscilloscope would definitely help to eliminate all possible doubts).
The most common fault is no output voltage at all.
Make sure to also check capacitors (including all those little SMD caps). Those bastards can sometimes go short and depending on their location they can cause all sorts of weird issues.
For example, if you find a shorted decoupling capacitor, the card will most likely work just fine even if you simply remove it without even replacing it. 😀

Assuming the card-in-question lacks an ASP/CSP chip, are the IFSD and APSD jumpers appropriately closed?

Cloudschatze wrote on 2021-11-24, 15:59:

Assuming the card-in-question lacks an ASP/CSP chip, are the IFSD and APSD jumpers appropriately closed?

Nice catch! Thanks!

I didn't consider that a possibility since the jumper pins for those settings are missing - but so is the ASP/CSP chip...

I quickly jumpered the vias with solder blobs and digital sound is restored. Sweet!

I'll probably add proper jumper pins at some point.

trozx wrote on 2021-11-25, 00:00:

Nice catch! Thanks! […]
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Cloudschatze wrote on 2021-11-24, 15:59:

Assuming the card-in-question lacks an ASP/CSP chip, are the IFSD and APSD jumpers appropriately closed?

Nice catch! Thanks!

I didn't consider that a possibility since the jumper pins for those settings are missing - but so is the ASP/CSP chip...

I quickly jumpered the vias with solder blobs and digital sound is restored. Sweet!

I'll probably add proper jumper pins at some point.

The jumper pins are called header. Are you sure that was missing and not only the junmpers themselves? So I was right and your claim "not my first rodeo" was a bit of a self-confident.