GPX 990 - need to fix RCA input jack - HELP?

Hello all. I just joined the forum this morning after researching my GPX 990 this weekend.

I inherited this killer box from my cousin, and the first thing i did when I got it home, was attempt to blast some Run DMC through the RCA jacks via an iPod (like I do on my other box.) Sadly, the left channel was extremely quiet. I found, that if I pulled the left RCA jack to the right a little bit, it would make a connection, and BOOM, there was the audio in all it's former glory.

So, I decided to investigate further. After taking it apart, I heated up that solder point to see if I could fix a loose solder joint, and when I heated it up, it lifted off the board, taking the PCB circuit with it. I then tried to tack a wire to the next component in line, but it's still quiet.

I'm wondering if the RCA jack needs replacing, or if the circuit just needs repair. Without a schematic, or a parts list, I have no idea where to start.

I've contacted GPX directly, to see if they have anything on file. I've only worked on DIY mic pre kits (difficult builds) and guitar pedals, but those are pretty much color-by-numbers. Working blind on an old boombox, I might be out of my depth.

If anyone has any any advice on how to proceed, I'd appreciate it a TON.

Here's me messing with my box over the weekend.

https://instagram.com/p/2OdNPvCo8G/

Do you have any pictures of the damaged section of the PC Board?

Good luck with this. I have a similar issue with one of mine so I'll be watching.

It's also worth noting that it's considered an "Also Known As" boombox.

Here's a shot I happen to have with my on my phone where I messed it up. Didn't even think to go conservative with the heat. that'll teach me..

https://www.dropbox.com/s/a3kib1ofpflvyt4/IMG_5019.JPG?dl=0

guerrilladigital said:

It's also worth noting that it's considered an "Also Known As" boombox.

Here's a shot I happen to have with my on my phone where I messed it up. Didn't even think to go conservative with the heat. that'll teach me..

https://www.dropbox.com/s/a3kib1ofpflvyt4/IMG_5019.JPG?dl=0

Click to expand...

It sure looks like you could simply attach to this post. Maybe run a wire from the other side of the board

I actually tacked a wire on the side you see (after I took this pic) without screwing put the board, but no dice on the audio. Could be a completely different issue.

Is this a switched RCA jack? Look inside the hole and take a peek. Also plug in a bare jack and test continuity between those two connections to make sure the signal is actually transferring.

If you push sideways a bit on the actual plug going into the jack & that restores a solid connection then it sounds like the RCA jack itself is dirty & creating too much resistance across the contact points. Clean them up as much as possible & check for loose fit, etc. If it's a bit floppy then the spring connector for the 'hot' or anode is tired & when you angle it connects better, maybe...

Cpl