Unknown Garrett Pro Pointer Issue

[OCBSlimz]

Hi Guys,

I have been repairing Garrett Pro pointers for a while now and have come across many problems including the common ones, falsing, broken switches etc.

I was recently sent a pro pointer that behaves differently. Upon switching it on it gives a buzz and a hum from the speaker.

It does not detect any metals nearby, just makes that constanst buzz and hum.

I have provided a video so you can understand a little better.
!!BEFORE YOU ASK!! The buzzing and humming happens even when the coil is soldered on, it makes no difference.

I have a HUNCH, and again i'm no expert. I beleive it may come down to the central 16 pin IC on the board.

The writing on the chip is 263G 1566, googling this takes me to a russian metal detecting site similar to geotech1.

I have no idea what this chip is nor can I find it on aliexpress or affiliates.


My questions are :

Is this the culprit to the default pointer?
If so where can I find this integrated circuit?

Has anybody else had this problem before,how can I fix it ?

The only information I have on this pointer is that it may have taken on water.


Any information you may give me would be greatly appreciated.


Kind Regards

Matt

[Carl-NC]

No doubt a micro, probably Atmel or PIC. Did you check power supplies?

[OCBSlimz]

Yes I did, i'm no expert on them... Ive got an output of 4v on pin 4. You want all of them?

[Carl-NC]

I have no idea what the supplies should be, it's just where I would start in debugging. The "buzz & hum" sound indicative of a low supply.

[kt315]

THD is fully analog, Pro is controller based. left of a schematic is same in both.