Need Help To Repair Sharp Bluetooth Speaker PS920

[RaymondRosas]

Hi everyone,

I could really use some help with fixing a Sharp Bluetooth speaker with the model number PS920. It's not turning on, and I'm hoping to get some suggestions. I've been troubleshooting and found that the power supply is giving a 14-volt output, but there's no DC output from the battery connection and DVCC5V.

I've already replaced a faulty capacitor, and the battery is completely drained. I tried supplying 12 volts from the battery connection, but still, there's no DC output. I've tested components like transistors, MOSFETs, and diodes using the FADOS9F1 tester, and they all seem to be okay. Right now, I suspect that the IC WB8PA76BE is the issue, but I can't seem to find any datasheet for it.

Would anyone happen to have a datasheet or schematic diagram they could share? Any help would be greatly appreciated!

[fzabkar]

That 14-pin IC looks like a microcontroller.

https://pdf1.alldatasheet.com/datasheet-pdf/view/1132952/FEELING/FM8PA76BEP.html (FM8PA76BE)
https://crossic.com/wp-content/uploads/2021/10/fm8pa76_1v30_003-1.pdf

https://m.jtm-ic.com/aspcms/news/2016-6-7/3234.html (CX8PA76BE = 14-pin OTP device)