The EVO 4G seems to have trouble with non-TRRS plugs.
I've had all kinds of problems with a standard 3.5mm TRS plug going into the aux of my car stereo. Songs skipping, pausing, voice dialing activated randomly, headphone icon switching from TTRS to TRS intermittently, etc. These usually seem to be caused by jiggling of the plug and/or cable.
Searching the web, it seems to be a common problem. The Headphone Blocker app tries to fix it. I've seen folks suggesting trying gold plugs, shielded cables, and various other kinds of voodoo.
IMO the problem is due to a cheap-ass headphone jack in the phone itself.
EDIT 7/8/2010:
It appears that adding a little padding on top of the jack, so that the case presses on it when closed, has solved the problem for several people (including myself). I highly recommend that you first try this before bending ANYTHING. I'm leaving the rest of the post below intact for context.
WARNING!!! DO THIS AT YOUR OWN RISK!!!
-----------------------------------------------------
I opened up the phone, removed the tape from the top of the headphone jack and bent the pin on the copper lead that's over the top of the jack more towards the bottom (Away from the S ring and towards the R ring). I've had no problems since.
Your mileage may vary...
Edit 6/26/10:
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I've heard from folks who have said they had better luck bending the contact UP not down. I pulled my jack far enough apart to see the plug as I inserted it and it looks like the contact is bouncing off of the Ring onto the Tip, so I tend to agree. (In other words, make the contact touch the jack closer to the jack opening, not further away as I first suggested.)
It's likely that I just got lucky when I bent mine and it wound up in the right place.
Also, I began having the issue sporadically again. I noticed there was some up and down play on the contact. I cut a few squares of plastic tape large enough to cover the jack and stacked them one atop the other and put the stack on the jack. This caused the contact to stay down once the cover was put back on. The problems went away again and I haven't had a problem in a few weeks. I'm wondering if HTC put that original band of tape across the jack for a reason... things that make you go hmmm.
The bottom line is that the jack and the plug do not align correctly, and careful manipulation of the contact does solve the problem. But if you screw up and break things in the process I doubt you'll be eligible for warranty exchange.
I've corrected my original image and added it below:
I've had all kinds of problems with a standard 3.5mm TRS plug going into the aux of my car stereo. Songs skipping, pausing, voice dialing activated randomly, headphone icon switching from TTRS to TRS intermittently, etc. These usually seem to be caused by jiggling of the plug and/or cable.
Searching the web, it seems to be a common problem. The Headphone Blocker app tries to fix it. I've seen folks suggesting trying gold plugs, shielded cables, and various other kinds of voodoo.
IMO the problem is due to a cheap-ass headphone jack in the phone itself.
EDIT 7/8/2010:
It appears that adding a little padding on top of the jack, so that the case presses on it when closed, has solved the problem for several people (including myself). I highly recommend that you first try this before bending ANYTHING. I'm leaving the rest of the post below intact for context.
WARNING!!! DO THIS AT YOUR OWN RISK!!!
-----------------------------------------------------
I opened up the phone, removed the tape from the top of the headphone jack and bent the pin on the copper lead that's over the top of the jack more towards the bottom (Away from the S ring and towards the R ring). I've had no problems since.
Your mileage may vary...
Edit 6/26/10:
-----------------
I've heard from folks who have said they had better luck bending the contact UP not down. I pulled my jack far enough apart to see the plug as I inserted it and it looks like the contact is bouncing off of the Ring onto the Tip, so I tend to agree. (In other words, make the contact touch the jack closer to the jack opening, not further away as I first suggested.)
It's likely that I just got lucky when I bent mine and it wound up in the right place.
Also, I began having the issue sporadically again. I noticed there was some up and down play on the contact. I cut a few squares of plastic tape large enough to cover the jack and stacked them one atop the other and put the stack on the jack. This caused the contact to stay down once the cover was put back on. The problems went away again and I haven't had a problem in a few weeks. I'm wondering if HTC put that original band of tape across the jack for a reason... things that make you go hmmm.
The bottom line is that the jack and the plug do not align correctly, and careful manipulation of the contact does solve the problem. But if you screw up and break things in the process I doubt you'll be eligible for warranty exchange.
I've corrected my original image and added it below: