Need help for repair

[alparent]

OK this is my first post on this forum and already I'm asking for help. (Not even sure I'm posting at the right place!)
Here goes, one of my friend as an Sovereign Elite and he asked me to try to fix it for him.
This thing is pretty banged up. It looks like it was dropped from a plane ........ and when the plane landed, it rolled over it!

I managed to repair most of it (re-did all the wiring, changed the phone jack) but the thing is stile not working.
All I get when I turn it on is a small blip and then nothing. I checked the power and I get a solid 12v.
Looked at the PCBs and no cold solder or loose parts (Man, these things are build like tanks!)

The only thing I found was a 8 pin SMD chip that was hot as hell. (I'm showing it in the attached picture. [attachment 317612 file.php.jpg])
From what I could read on the top of the chip (using a microscope) it's 239A PTBR.
Anybody know what this part is? Or what could be my issue?

From reading other posts I see that there are a lot of very knowledgeable members on this forum, So my hopes are high )

Thank you

 

[Cameraniac]

The blip is normal. As you turn the knob clockwise you'll hear, in this order, click on, blip and then silence until you get a threshold tone that gradually gets louder the more you turn the knob/dial or whatever you want to call it. You may already know that but thought I'd mention it. Sorry I could not be of more help and good luck to you.

 

[dewcon4414]

Ive no idea what that is, but Daddy is right about the blip. Could be your threshold or volume.

 

[Harold in NC]

why don't you go on Geotech forum maybe somebody could help you.

 

[Auriemma]

If you need it looked at, call the Kellyco Minelab Repair Center, ask for Barry. He does great work. He fixed my Sov XS before, and will fix it again (I dropped it last weekend). $75/ hour bench charge plus shipping. 37.50 minimum charge. Well worth it.

 

[bklein]

I'm a bit late on this but it looks like right next to it there may be another of the same chip.
Swap the two to verify the heat stays with the same chip - otherwise it is something the original chip was connected to that causes the heat.
A 239A could be a voltage comparator chip but I kinda doubt it judging by the trace sizes I see.