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Hi there, sorry to hear you're having trouble with the sub,
Are you still getting any light showing on the sub?
If not, then the power supply/amp in the sub, is most likely faulty
if you are, then it may be a signal output issue from the yamaha.
You actually don't need a digital coaxial cable, these units use an analog signal. Digital coax is really no different than a regular analog rca type cable, they just sometimes have a bit extra shielding, and cost a lot more. A regular rca cable will work fine too.
What you can try to trouble shoot this is to hook another device directly to the sub, bypassing the yamaha.
You could use the rca stereo outputs from a cable/satellite box, dvd player, etc, or use a minijack to stereo cable connected to an ipod or phone.
It won't sound great, because its' only playing the bass that is filtered out, but if you get sound that way, then you know the sub is good.
if you don't, then the sub is the failure point.
If it comes to that, repairs really aren't going to be practical, you could buy a new powered sub for less than you'd spend to get the amp/power supply fixed. In some cases with subs like this you can swap out the entire amp section and replace it with a plate amp, but because this sub is so small, a standard plate amp wouldn't fit, so that brings us back to a whole new sub as the best option.
If necessary, I'll be happy to help you find a local repair shop, or recommend a replacement unit.
Yes, still got a light (red) on the sub.
I hooked it up to my android and it still didn't work, so I guess it is the sub.
I don't want to spend more than 100-200 on a new sub. is that a reasonable price for a good one?
Yes, there are quite a few powered subs in that price range.
An 8" unit would be comparable in performance to the infinity, though you could go with a 10 as well if you like a heavier bass.
Yamaha makes a pretty good compact 8" unit:
Yamaha YST-SW012 8-Inch Front-Firing (click for link)
Nathan, I have pulled the circuit board out of my Infinity TSS1100 subwoofer. I am wondering if you happen to have a schematic for it so I can check some of the resistors. The board has blackened on one side of the board, opposite of the resistors.
Hi Kolin, I'm uploading a copy of the service manual here, which will contain schematics for you, which should help with the values of the resistors if you are wanting to replace them.
However, this model (and a few others, like the 1200) had a high failure rate, often the relay that puts the system in standby mode when there isn't an audio signal. If that shorted (or another power supply component) that is more likely what happened here, and the resistors were just the weak spot that took the damage. Just replacing them may not fix anything, and the new ones may get fried as well.
It's hard to tell from the photo, but it looks like there are some brown spots on the plastic frame around the big transformer, so it may have overheated or failing too.
Best of luck to you with your repairs.