ZK-TB21_bluetooth_remove
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 | |||
|---|---|---|---|
| 1 | unknown | 24 | unknown |
| 2 | unknown | 23 | unknown |
| 3 | unknown | 22 | unknown |
| 4 | unknown | 21 | unknown |
| 5 | unknown | 20 | unknown |
| 6 | Power signal | 19 | unknown |
| 7 | R signal out | 18 | Vcc |
| 8 | L signal out | 17 | unknown |
| 9 | unknown | 16 | unknown |
| 10 | unknown | 15 | unknown |
| 11 | GND | 14 | L signal in |
| 12 | unknown | 13 | R signal in |
Cheat sheet
Pin 6 <-- short --> Pin 18 Pin 7 <-- short --> Pin 13 Pin 8 <-- short --> Pin 14