Garrett Infinium LS

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A component going up in flames so to speak, is a sure sign of overvoltage, or excessive current. There could be some other component which is depleted below it's optimal operating range, but not completely shorted which allows the detector to work for few hours, but gradually, same components fail time and time again. After replacement of those components, you may want to monitor the quiescent current when the detector is powered on. Based on that you might be able to see whether the detector is power hungry above and beyond it's normal operating range. That could give indication of some other unknown component failure.
The coil and cable need to be suspect as well.

[gerson]

Okay. BannerThanks for the information . Happy 2021 for you and your whole Family. Success.
OK. BandeiraObrigado pela informa??o . Feliz 2021 para voc? e toda a sua fam?lia. Sucesso.

[localbug]

Hi Gerson,
Remove the coil from the detector then check pin connection of the coil with a DMM, check the ohm reading and continuity. there are 2 windings inside the coil housing.
test it under dry condition and also when the coil submerged in the water. this test is to see if your coil has shorted connection.

For the detector you must use fresh or fully charged battery. Check voltage of the battery from the connector before connecting it to the PCB this is to make sure the cable and battery tab has no issue.
then connect the battery connector to the pcb connector. power up the detector and check again if there is a voltage drop. Voltage drop is a sign there is something wrong like short circuit or damaged components.

Continuity check for a shorting capacitor or resistor (resistor with low value maybe indicated as shorted, just do the resistance reading to double check).

Isolate the supply power to locate the cause of the problem.

You can use a small speaker to see if the Tx is working by placing it near the coil, if its ringing the Tx is okay.

Use a DMM continuity feature to check if your Rx still good by touching the black probe to the ground and red probe to the input pre amp. if its making a sound then your Rx is okay.

I'd love to see closely the pict of the PCB and all the components. I see lots of similarities with Infinium, ATX and Recon.