C-Media CMI8738 audio card whining

[Behemot]

I have this audio card in ASUS TUSL2-C and I hear the speaker whining even if sound is muted.

My first sucpect is PCI slot - I have the card in the last PCI on the bottom of case.

The second suspect is that I overshooted PCI caps capacitance. IIRC there were 1000 uF caps and I changed them for Samxon GC 3300 uF ones (did not have lower capacitance ).

However there should be no drasticall current flow between CPU and PCI as I changed all the crappy caps with low capacitance in VRM for the GC Samxon's. I also added the caps which were not ocuppied so the capacitance aroud PCI slots should've risen equaly to VRM capacitance.

You guys are far more educated in this area than I am, so any idea where the problem could be?

[Behemot]

Re: C-Media CMI8738 audio card whining

OK, calm down men...so I realized swapping cards is still faster than changing caps again even if it drives me crazy. Now network card is in no. 4 and audio card in no. 5, both running fine. Thanks god.

But anyway I though PCI related problems (IRQ stuff, only one card works or no card works etc.) are more VIA's domain. Guess I've been wrong. No matter if you have VIA, NVIDIA or Intel chipset, it's still the same shit full of swappign cards and moving with them in slot using brute force. I should partially blame people around the world also...their interest in shining stuff makes gold prices to rise all the time...we NEED more gold in electronics! F****ing contacts make much problems too.

It concerns me what would happen if I used all the six slots...the computer will burn in fire I guess...?
_____
Anyway, if somebody would have similar problem, try playing with card position first

[Scenic]

Re: C-Media CMI8738 audio card whining

those cheapo cards caused nothing but trouble for me with their next to nonexistant filtering.

the few caps that are on it sometimes don't even have a manufacturer on them..

i switched over to Creative Soundblaster 128PCI for cheap PCI cards with no fancy crap noone needs.. never had a problem with those..

[Behemot]

Re: C-Media CMI8738 audio card whining

Yeah I tried some card with SB128 chip but the system crashed soon after starting up That's for the PCI problems I've been talking about...

[Agent24]

Re: C-Media CMI8738 audio card whining

I wouldn't change 1000uF for 3300uF or add capacitors in empty positions unless you know it's OK to do so

I have two CMI-8738 based cards though, and I have had IRQ issues with both.

If I remember right, when they share IRQ with LAN card, they have major issues with audio skipping etc when the LAN card is in high use. Maybe yours was having an issue with some other card.

Anyway, your problem was most likely the card and not the board, actually...