Hi,
Dear @Protegimus
You are right about the CS1 capacitor. See in my post #31 the marking I made in the position in the image I sent. Note that the CS2 (electrolytic) capacitor was without the silkscreen, and you added it to your message, in message #35. Correct.
Therefore, my suggestion is to place the 10nF/J/400V capacitor in parallel with CS2 (electrolytic), on the solder side. This will maintain the logic of your brilliant article.
Here in my country I managed to buy TDK 10nF/J/400V and also 630V polyester capacitors. But PANASONIC brand electrolytic capacitors are not available here, and to import them, the legal taxes and shipping are astronomical and unfeasible. I won't change them for now.
I also intend to place an extra 12VDC cooler, to blow the heat generated from inside the case to the outside, over the SMPS heatsink, to help with the internal ventilation of my MSO5000. I will put between the Voltages (+7V and -7V), which will give a total between them of 14VDC. And insert there (3x 1N4007 diodes) in series with (+7V), to give a drop of 3 x 0.7 = 2.1VDC. To maintain the Cooler voltage specification at 12VDC.
In my country, temperature and humidity variations are very high, and on days with temperatures above 30 degrees Celsius, the inside of my MSO5000 heats up too much.
I have already placed the new cooler outside the case, with an external 12VDC source, and the results are good, the internal temperature drops a lot. Without the new fan, sometimes the CH2, CH2, CH4 channel inputs are activated randomly, without the external cooler.
I hope to soon complete the entire procedure and list the results here.
I haven't opened my MSO5000 yet. It is now out of Factory Warranty. I have already defined what to do to install the polyester capacitors, and how to attach the new Cooler.
I am very grateful for your commitment.