Noisy front panel headphone connector on ASUS m5a78l-m

[Mrx3750]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

Okay, measured set to AC, and 0 volts.

0 volts AC, .09 MV DC, 0 ohms, and no flowing current, either AC or DC.

Soldered in a 104 numbered disc cap between the front panel ground wire and the casing. Might have slightly lessened the noise, but I can't be sure.

[dj_ricoh]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

Geeks, nerds, etc.

mad scientist

[ben7]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

It is grounded to the casing.

I haven't solved the issue yet, but I ran across something that might be relevant to other people.

Apparently lots of times this noise can be caused because the USB ports on the front and the headphone and microphone connector all share the same ground. That was the case with mine, so I used my Dremel to sever the ground, then soldered on a wire and connected it to the casing.

Didn't work for me, the noise is still there, but might work for some future reader of this thread.

Now now, are you sure you severed the ground trace(es)? There might still be a connection between the two.

Hm. Need one of those. I likely have one on one of these TV chassis boards. .01uf, would that just be numbered 01 on a disc cap?

Edit: Oh wait I remember now, should say 103 on it. Or is it 104? 104's I have a few of.

Correct,
1uF = 1000nF = 1000000pf = 105
0.1uF = 100nF = 100000pf = 104
*** 0.01uF = 10nF = 10000pf = 103 ***
0.001uF = 1nF = 1000pf = 102
0.0001uF = 0.1nF = 100pf = 101

I have this problem with my PC. I work around it by using the headphone jack on my speakers. It only happens in the Antec 1200 case. I used to have it in a CoolerMaster Centurion 5 II, and it didn't happen there. This case has had the same problem with 2 different motherboards

Tis is a crappy, flimsy antec case? I wonder if that is the issue.

[Mrx3750]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

Now now, are you sure you severed the ground trace(es)? There might still be a connection between the two.

Holy crap I think you're right. I just disconnected the ground wire, which should have cut off the headphones, it didn't.

[ratdude747]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

Tis is a crappy, flimsy antec case? I wonder if that is the issue.

I didn't think antec made crappy cases. If it were a powmax or the like, then yeah, flimsy.

[Mrx3750]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

That did it! There was another ground trace on top of the PC board! I cut that, and the noise is gone!

Now here's where it gets weird. I don't have the case ground hooked up. I tested it without it hooked up to see if there were any more grounds. There are, but now I don't know where. In any case severing it from the USB ground fixed it.

[ben7]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

That did it! There was another ground trace on top of the PC board! I cut that, and the noise is gone!

Now here's where it gets weird. I don't have the case ground hooked up. I tested it without it hooked up to see if there were any more grounds. There are, but now I don't know where. In any case severing it from the USB ground fixed it.

Congrats! ;D

[Mrx3750]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

Thank you ben7!

Why the hell do they tie in the headphone ground with the USB? And they did it twice, a redundant double ground!

[Th3_uN1Qu3]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

That did it! There was another ground trace on top of the PC board! I cut that, and the noise is gone!

Now here's where it gets weird. I don't have the case ground hooked up. I tested it without it hooked up to see if there were any more grounds. There are, but now I don't know where. In any case severing it from the USB ground fixed it.

There is a ground wire coming via the connector going into the motherboard. That's where. Congrats for getting to the bottom of it!

[c_hegge]

Re: Noisy front panel headphone connector on ASUS m5a78l-m

...flimsy antec case? I wonder if that is the issue.

Nope. It uses 0.8mm steel (or maybe 1mm, can't remember which), and it weighs a ton