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I'm new to electronics and my Bluetooth speaker broke and want to fix it. This is the chip I think I need to replace.

JL BT chip

Can anyone help me find this chip's datasheet? I just need to know what each pin does. I have tried to find it but I couldn't find any info on it. Maybe because it's from a dirt cheap speaker.

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    \$\begingroup\$ Hi! Welcome here. Don't forget to check up on your answers, and upvote; accept once you're pretty sure no better answers will come in. I'm pretty sure no better answers will come in. \$\endgroup\$ – Marcus Müller Apr 5 at 20:13
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The manufacturer is Zuhai Jie Li (珠海杰理) Many of their part numbers start with ACxxx

http://www.zh-jieli.com/

...but this particular part does not appear to have an publicly available datasheet.

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This appears to be a part number specific to the programming of the CPU/DSP based on a generic part. For example, here is a zh-jieli JL 6905A that has a BT 4.2 radio. So these cheap little BT 4.2 gadgets from 2017 onward may have this generic device:

http://img005.hc360.cn/k1/M09/34/E3/wKhQwFmw58KEPsWjAAAAAJGE4z0447.pdf

It may be that buyers order a specific programming and the actual number JL stamps on the device may be tagged to the buyer. It seems that even specs for a generic device can't be found on their site and I don't know why.

It's possible this PDF might be the one for yours, try following some of the signal paths and see if they agree with the pinout.

So I believe what you'd need to do is find another board with a chip that has the same number and lift it, because it seems you can't order one from anywhere.

The generic device for BT 5.0 version such as in the fosiaudio amplifiers (eg ZK-502T line) may have very similar specs to this one, other than improved bitrate and XMT power.

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This is the manufacturer http://www.zh-jieli.com/, look there.

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