lamalta129 wrote:This is great news. Thank you so much.
So it was only the 5 caps, C907 to 912 that you replaced in the end?
I’m not completely inept at soldering but was wondering if you could circle which caps those are in your image?
Do you suspect it would be those 5 or would only a few be the main culprits? I’m getting the whining from the headphone and line outs. Mostly concerned with the line outs.
Yo!
That's actually 6 caps, but let's not get into a fight over arithmetic
Jokes aside, there's an image on my instagram here:
https://www.instagram.com/p/BZCS0jpH9cw ... iskmachine hope it helps!
There are markings next to the caps on the silk screen of the PCB so it shouldn't be too much of a hassle figuring out what is what. ^_^
As per my analysis, these were the caps (C907 to C912) that were responsible for DC filtering (removing noise on the VCC and VDD rails). I guess it wouldn't harm to re-cap some of the SMD components that also share this responsibility, but I don't have a hot air soldering gun so I just left them in place.
I was happy with the result - no piece of electronics at this price point is completely noise-free, but the positive change I personally experienced was quite dramatic.
One thing tho, I found the solder job to be a bit tedious as the pads are very tiny and hard to get to. If you decide to do this thing, I'd recommend a very fine chisel tip and to use a generous amount of liquid flux.
Another thing, these caps are of different values, be sure to replace them with the correct value!
About PSUs - get one from your local music shop. Reversing polarity is as simple as just cutting off the leads and swapping them around if they don't have it in stock.
I haven't done any line-in sampling after my mod, but my conclusion to of the nature of the problem would be related to the actual power supply rails and that this re-cap should solve problems on both input and output.