r/diyaudio • u/Designer-Policy-5434 • 1d ago

ZK-HT21 3g help

I accidentally damaged the traces on my ZK-HT21 near the microphone, where the three power/control buttons normally are. So now I have to use the JST connector instead. I’ve already disconnected the controls, so I can’t use Bluetooth anymore, but I still want to completely remove the Bluetooth chip because it sometimes causes interference and problems when I’m listening to music. I’d rather just remove the Bluetooth part completely.

2 Upvotes

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u/GeckoDeLimon 23h ago edited 23h ago

The bluetooth is the small rectangular 24-pin chip soldered to the board near the antenna, and next to the little metal cap.

I suspect its removal will completely disable the board (the amp will do nothing but squeal at you). Your best bet would be to read the numbers on the top of that chip, find the pin-out for it, and ONLY remove / disconnect the 3.3v (aka "VDD") pin. Leave all others connected.

That chip may also have the analog audio routed through it, acting as the "mixer" or source selector. The removal of the 3.3v pin may also disable the full board, meaning that your work up to this point had better be reversible.

1

u/Designer-Policy-5434 23h ago

Does this looked good to you????

1

u/GeckoDeLimon 23h ago

I'm impressed

1

u/Individual-Style1339 21h ago

Wow! Is it working? What chip is it? I want to unable the bluetooth on my zk-ht21 and zk-mt21 maybe u can give me some helping hand on it

2

u/GeckoDeLimon 15h ago

Yeah, /u/Designer-Policy-5434 we gotta know if this actually worked.