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What I had done wrong is that I had not detached pin #2 from each original potentiometer on the motherboard. I already fixed it and it works perfectly.

Friend, I think something was done wrong, today I tried the mod again, and I think the 3 new knobs have no effect, I think my mistake is in the points2, 5 and 8 of the SW, I connected them to pin #2 of each of the original knobs, I don't know if it was from there that I had to take them? I feel...

I have finally finished making the mod, with the help of a very skilled cell phone technician with soldering tools. Everything works fine without noise, (I spent a total of about 30 dollars on everything parts required + assembly and hole making costs) I used 3 additional, B10K potentiometers...

Greetings friend, currently I will modify mine, the manual work will be done by an expert in smartphone boards from my city. (I just need to be clear in telling him what to do). Question #1: At points 2-5-8 in the schematic they look empty, however in your initial photo I see cables, can you...