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This is the combo power and audio connector on the Nintendo Game Boy Advance SP.
                                 | 1  ___  2 |
                                 | ---- ---- |
                                 |_6_5   4_3_|
(this is when looking into the port on the console)
1 Headphone Detect Short with main Ground to disable internal speaker 
2 Audio L Left audio out
3 VCC (+) 5.2v DC power, input and output
4 Audio R Right audio out
5 Audio GND  


GND (-) Main Ground, connected to shield

The previous version of this page states, There is report that 1+6 doesn't enable audio out and does not disable internal speakers. 5+6 do.

Through a basic test, I have verified that, at least on model AGS-101, shorting pin 1 to 6 does disable the internal speaker, while shorting 5 and 6 just makes audio louder, and might be harmful to the amplifier. There is a 10 Ohm resistance between Audio GND and main Ground. Additionally, both audio channels will play without the internal speaker muted.
On the original DS, Audio GND is isolated from main Ground and will not work to mute the internal speakers. The DS also still plays audio out this port without the internal speakers muted.

According to 6 reports in our database (4 positive and 1 negative) the Game Boy Advance SP EXT.2 & Nintendo DS charge port pinout should be correct.

Is this pinout
Game Boy Advance SP EXT.2 & Nintendo DS charge port visual pinout:click to enlarge
Source(s) of this and additional information:, None
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