[MOD] Galaxy Mini S5570 louder headset HARDWARE MOD
Had one of those lying around for a while. It was missing some parts such as the screen, battery and volume buttons. I had purchased replacement screen and battery about 2 months ago, but i did not want to put it back together unless complete. So i waited for a source of volume buttons, and finally found a donor phone yesterday.
Wanted to use it as a secondary phone and for listening to music, since something broke in my SII, and the right headphone no longer has any sound. I don't want to open the SII it up again as it is my primary phone and works great in all other aspects. I know what broke (solder connections of the audio IC) and attempting a fix runs the risk of losing all sound, which i'd rather not.
So now with alI parts in place, i put the Galaxy Mini back together and installed this ROM: http://forum.xda-developers.com/show....php?t=2308041
The Beats sound effects including in that ROM made it sound "okay", but it could use some extra oomph. So i took it apart again and looked for something. And found it... Even more obvious than other devices i've done this mod to. The audio was routed thru 2 33 ohm resistors before reaching the headphone socket. Considering that your typical headphones have a resistance of 32 or 16 ohms, this means that only one half (32 ohms) or one quarter (for 16 ohms) of the power the amp put out, actually made it to the headphones! This corresponds to a 3dB (for 32 ohms) or 6dB (for 16 ohms) increase in sound output.
Even with those two resistors bypassed, there is a bit more resistance between the amp outputs and the headphone socket (4 ohms), but i left it like that, as that little resistance has almost no effect on the volume, and helps protect the audio amp.
Note that in the pics, i have managed to pull off one of the resistors. That's okay, as i had no intention of putting them back on.
It doesn't matter whether you solder wire on top of them, remove them and solder wire, or solder 0 ohm resistors instead, the outcome will be the same.
- Philips #00 screwdriver (to open the phone)
- 0.1mm wire or 0 ohm 0402 resistors
- Temperature controlled soldering iron with fine tip
- Flux paste
- 0.5mm solder
I am not responsible of any damage this modification may cause to your phone (or your ears).
- Solder 0.1mm wire over the two resistors in the picture, or
- remove the resistors altogether (heat both sides with your iron, they will come off) and solder wire in place of the resistors or
- remove the resistors and replace with 0 ohm resistors.
- Enjoy a louder phone.