Bob and Brad QL/MINI massage gun not charging

[valvashon]

My (legitimate) massage therapist gave this to me to try to fix last time I saw here. Complaint was that it simply wouldn't turn on anymore. B&B have a rediculous return policy where you have to make a 3 minute video showing what the problem is, etc. Rather than mess with that Dana let me take it to try to fix it.

Verified that it wouldn't turn on. Don't remember trying to charge it before I took it apart. Found that the motor turned freely. Pulled the battery connector apart to check the voltage and the battery voltage was good- fully charged in fact at 11.3 volts. Plugged battery back in with reversed polarity (connector doesn't prevent it well) and heard a "pop". Nothing was visibly blown so the noise may have been an electrical "snap". Unplugged battery, plugged it back in correctly and was then able to start the massage gun. Gun works perfectly, massages at all speeds, turns off automatically, etc.

However, the device does not charge. It does not detect the USB-C cable plugged into it no matter what cable I'm using or what charger I am using. Should show indication of charging but doesn't. Should not be able to turn massager on while charger is connected but I can indicating that the charger is not detected by the control board. I'm thinking that the large, two legged device in the last photo is a protection diode but I'd like to confirm that before I try to remove it from the board. One leg it connected directly to the positive of the battery and this is the first device that would have been hit with reversed polarity. I'm not getting anything back from the numbers on that device.

Any advice? I could probably run the battery through some sort of external charging port but there is literally no room in this case to add anything.

Connector in first picture is where the motor plugs in; second picture shows the edge connector that goes to the switch control board, the USB C jack and the battery connector and the third picture shows the device I have a question about. It's marked "T090P03l2P" and "FJC712".

[valvashon]

The cryptic markings on the case led me to "CR Micro" which then revealed that the part number is CRDT080P03L2P, a silicon P-channel power MOSFET. Can't find any for sale so I will have to cross if I find it to be bad.

[valvashon]

Checked and found that the power MOSFET was good. Did some more component research and found that the likely culprit is the IP2326 chip, in the circuit as a 5 volt boost charging module. I found a very similar circuit board on AliExpress where it boosts the 5 volts in to 12.6 volts for battery charging. I purchased that board and was going to somehow tag it onto the bad massage gun board using it to charge and the massage gun board to operate the motor.
I could still do that but the best fix would be to replace the chip on the bad board. I am experience in board level repair and soldering but don't have the equipment and skills to R&R a chip this size. If there is anybody on here who would like to take on this small job message me and we'll discuss price. I don't have a lot of $$ to throw at this but it looks like a pretty small job so let's talk. If you are interested I will get some raw chips, you don't have to do a transplant from the new board that is on it's way.

Thanks-

Val

[valvashon]

Oops- sorry about soliciting a repair in the above post. I didn't realize that badcaps was also a repair place. Doesn't sound like they would take on this job anyway but their flat fee is more than the cost of a new massager. Do not message me with an offer to repair.