said by pnjunction :

They'd be more trouble to fix than they're worth IMO unless it's something as simple as a blown cap. You'd also need some decent soldering skill/equipment to get anything other than a cap or resistor replaced.

Considering the lack of schematics or proper diagnostic procedures and the retail cost of replacement parts, a few rounds of "swap-and-pray" could add up to the cost of a new unit in no time.

said by An_Onymous :

Beyond that, not a whole lot you can do as the main SoC is likely a BGA parts as least in the case of the ST-516 V6.

said by An_Onymous :

Not like you can order the big SoC easily from the vendor easily or that replacing the BGA would make any economic sense for you.

I would recommending looking at the driver/receiver chips in your bone pile. That's the soic-8 right next to the sticker SB10A in picture (ST516V6). It should be very common froml the analog chip vendors were selling their DSL driver/receiver chips - fancy opamp parts.

You are looking at a $1 part and a 2 minutes replacement job.

said by Inssomniak :

Recently I ran into a new irritating problem, I set up a 2700 here, tested it, put it on my DSL line here at the house, no problem, sync's fast and perfect. I give it to the customer, wont sync. I do it again to another 2700, same thing.

2 other DSL modems sync fine on the customers line.

Only difference is the loop length, here Im on a 900 meter or less loop length, and he is on a 3k meter loop.