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How to remove bluetooth from ZK-TB21 or ZK-MT21

ZK-TB21 is 2.1ch power amplifier.


ZK-MT21 is 2.1ch power amplifier.


Bluetooth chip is JL AC23BP. No datasheet available.


Remove the chip from the board.


Removed IC.


Short the power signal.

short IC pin No 6 and C9.

Pin 6<-- short -->C9
* M5350B regulator is MST5350BTS. 35v to 5v.


Bypass audio signal.

short C2 and C15. Left audio channel signal.
short C3 and C17. Right audio channel signal.

C2<-- short -->C15
C3<-- short -->C17


Board with Bluetooth removed.


AC23BP chip pin layout

AC23BP
1unknown24unknown
2unknown23unknown
3unknown22unknown
4unknown21unknown
5unknown20unknown
6Power signal19unknown
7R signal out18Vcc
8L signal out17unknown
9unknown16unknown
10unknown15unknown
11GND14L signal in
12unknown13R signal in

Cheat sheet

Pin 6<-- short -->Pin 18
Pin 7<-- short -->Pin 13
Pin 8<-- short -->Pin 14