[SOLVED]820-3115, U6201, Missing Pads for GPIO

[SMMRepair]

Trying to save an 820-3115 that some heavy-handed oaf worked on. Damaged a few things which I've sorted, but I seem to have hit a wall with the audio:

Pads 12 (GPIO_1), 14 (GPIO_2), and 47 (SPDIF in) were ripped off of U6201's site. They don't appear anywhere else in the schematics or in the board view. I inspected the pad-sites very well and neither of these 3 pads appear to have traces underneath that I can attempt to anchor to. Right now, the audio on the board works at about 5% of normal volume (missed that it was present at all until I listed extremely closely), and only from the right speaker.

Is this board fucked in terms of internal audio? Nowhere to run wires apparently, and no traces visible underneath the pads. Any advice appreciated.

 

[smiba]

Those pads came off because they're unconnected, they aren't needed.

Your issue with low to almost non-existent volume is somewhere else. I would recommend first checking the resistance in the output stage of the amplifier, since maybe the audio is just disappearing to ground.
Is the analogue voltage to the DAC/Amp ok? (PP4V5_AUDIO_ANALOG). Does it work with headphones?

Could be a lot of things, never seen this specific issue before.

 

[SMMRepair]

Thanks, smiba. I thought that might be the case, due to the missing traces. I couldn't figure out the purpose of having pins with actual names that imply input/output, but have them go nowhere. I'm sure there's a reason beyond my current knowledge.

I stopped troubleshooting to ask this question, as I didn't want to spend time troubleshooting if the issue was obviously at U6201. I'll get going on it as planned now and will post back if I can't restore audio--thanks again, Smiba! I have a feeling some of the amps might be damaged, as whoever "replaced" U6201 did an absolute shit job, and this board had a short on 1v5 that I had to resolve previously. Wouldn't surprise me if they did this with the battery connected.

 

[SMMRepair]

Got this one resolved; issue was a few poorly-replaced amps (a theme on this board) and a grossly-corroded U6400. Gotta love cleaned and damaged boards! Thanks!