Whites MXT Repair

[RyanZ94]

Hello All. New to the site, but not new to metal detecting. I recently picked up a dead whites MXT detector that I cannot get to boot up. I am looking for some technical information or a schematic to help me troubleshoot what is wrong with it. I am thinking that water damage is the cause of the failure. I'm looking for a whites tech or someone with known information to help. Currently I have the top half of the display showing all segments dark. Transistor Q3 is getting hot when turned on.
Thanks,
Ryan

 

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[vpnavy]

1st - I noticed this was your very first post - so, Welcome Aboard! Take a look at Forum: South Dakota for information (i.e., clubs, etc.) directly related to your state.

2nd - While waiting for a member response - you might consider posting your pictures on BRANDS > WHITE'S for more exposure...

3rd - I searched

and found a solution that is "close" to your problem on WHITES V3I PROBLEM AND SOLUTION (Sep 22, 2012)...if you search that forum - you will get other hits...

4th - I searched Google and found a manuals (you didn't mention the model number) so here are a just two I found while searching on for whites owner manauls" - their were others...

White's MXT 300 manual (English) - Garrett Metal Detectors
White's MXT Pro manual (English) - Garrett Metal Detectors



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[Treasure_Hunter]

Welcome to TreasureNet.

Contact Garrett's Detector, they bought Whites. No one is going to have the schematic.

 

[Carl-NC]

Q3 is the transmitter driver, if it's getting hot it means it is stuck "on" and is dumping DC current through an internal boost coil. Most likely because the micro isn't providing a clock signal to it, which probably means the micro is dead. You can check for this with an oscope by probing test point TP13, it should have a 13.9kHz square wave @ 5V/0V.

 

[Sheppie22]

Can you run that by me again.