the picture doesnt show detail how to open it. i been trying for the past 3 days, still no go. i am afriad using too much presure will chips the edge.
A medium-thick guitar pick is a good tool. Thinner bank-or-such cards work too; perhaps use a knife to make the edge thinner. Proceed gently. Mind not mess around the volume and power side buttons.
which area to open first?
Best to get the sgs2 service manual and follow the instructions. It shows the exact positions of the clips. AFAIK with the display facing down start at top-left corner and proceed in the anti-clockwise direction. Reassembly order is different (top-left-right-down).
I found putting a piece of card under the back of the top earpiece speaker didn't work as card conducts sound. I cut a piece of white foam wrapping,folded it double and it worked perfectly as foam does not conduct sound throught it to the back case. The white wrapping foam is the type you find most electrical items wrapped in and is widely used.
It is obvious the fault on my phone was due to the earpiece speaker pressing on the hard plastic back case and transmitting the sound through the case to the mic at the bottom causing an echo.
I agree a suitable foam should act better as sound insulator.
I find it odd that such sound transmission occurs and that it gets amplified by external cases, but it obviously does. I found nothing odd below the speaker (but I did scratch the speaker while pulling it out - carefully!). The thin circular sticker (number 17 on top) is the only thing Samsung puts there, mine had visible pressure marks made by the back of the case. Maybe the main cause in my case was the squished rubber on the bottom mic which should reduce the transmission from the case to the mic.
Hi!
I have the echo problem only when I use a cover and the volume is set at or near the maximum.
Without a cover and/or at mid volume, I do not have any echo problem.
Did you test your modified Galaxy S2 at maximum volume (and low background noise) with a cover?
The problem comes in different magnitudes. My phone was originally next to unusable, full echo with case, some echo without (max volume). My friend's was affected but not as much, a bit of echo with case.
Btw I think there are other possible causes of echo (firmware, network...?) because I still get the echo problem now and then, although there is no more echo most of the time and the folks that hear themselves echoing generally don't have such problems. Toggling noise cancellation during the call usually helped when the problem occurred; once it would not but the echo disappeared after I hung up and called again.