bass electronics help

[Folded Brick]

I have ESP/LTD F-104 that I have been playing for about 5 years now but for some reason it no longer works when I plug it in. it has EMG active pick ups so it put in a new battery to see if that was the issue but it wasnt. i know nothing about guitar electronics and hopefully someone here can give me some advice. Thanks.

[Jazz P Bass]

The ESP. LTD uses the ABQ 2 band active electronics setup.
These EQ's are not easy to repair.
They are small, the parts are surface mount, there is no documentation on them.
That being said, the complete ABQ is available.
LinK: ESP LTD ABQ 2 Band Bass Guitar Active EQ System | eBay
But of coarse you do need to identify what is wrong.
Did you try another guitar cable.
Make sure it is inserted all the way into the jack (2 clicks).
The second click turns on the battery.
You could open the rear cover and look for any wires that may have come off.
Other than that, you need a tech.