the 5V is still stable, after factory reset the HV comes up and hungs around 170 / 135 V (as you wrote it will be normal when no Tube is connected).
Just the thick LED won't glow / fade ... nothing gets hot or do something "not normal".
the test-wiring is this:
SV2 Pin 1 (GND) -> one pin of the Button and the negative pin of the thick LED
SV2 Pin 3 (BTN) -> other pin of the Button (for factory release)
SV6 Pin 4 (this who is connected to R19) -> positive Pin of the thick LED
The RTC is connectes as written: GND to GND (SV4 Pin4), VCC to VCC (SV4 Pin3) SDA to SDA (SV4 Pin2) and SCL to SCL (SV4 Pin1).
when i'm home i will take some pics of the board with wiring, may this will give another "look at the things"
Your manual is clear ... i must just learn to read all of it.
but when you ask this way: i just want to use the INS-1 Neon-bulbs as separator (in a later clock).
how can i connect then correctly?
in the manual you wrote: "For each neon, place a 56-100k resistor in series, and drive from the HV output on the power connector on the board."
this means a resistor per neon and this connected to the HV, so i can do 2 resistors and 2 neons parallel or as a series ...?
may you have a circuit schema / draw of the current path for this?