skr 1.4 turbo - thermistors always in open state, ADC out of range

[KnYaZuK]

Hi there! A have an issue with the thermistors connection.
I v already tried marlin 2.1.2, 2.0.9.5 and some older versions.
Also a tried latest version of the klipper firmware.
Everething works fine, but not the thermistors. I think the problem in mainboard. I buy mainboard in the middle of 2019 and it was installed only now in 2023 =)
Where should i look? The adc debug shows 4095 value. The pronterface and my btt tft display shws me zero celcius. The thermistors i use is 104gt-2. I am already bought new one - the result always one - 4095 adc value.
The Klipper firmware also crashes witth "ADC out of range error"
With the marlin- if i warm up the thermistor to the 60-70 celcius - it will show me the temperature and the ADC value will droped down to the lower then 4000 values.
Accordingly i made a conclusion - the problem in the mainboard.

I am also have the Trigorilla 1.1 and on them thermistors works fine and shows me the correct ambient temperature.

Please, community, help =\ I tired...

[radek8]

Do you compile your own Marlin?

[KnYaZuK]

Do you compile your own Marlin?

Yes, i also tried some pre configured builds and result the same. For now i ordered the new skr 1.4 board. Not turbo. But i want to understand what happened wrong with my skr 1.4 turbo board.
Maybe some of us already faced with the same problem. I was not found any similar cases here and inside the marlin repository issues.

The t1, t0 and tb pins have the 3.3 volts when the board powered from the 12v power supply.
The thermistors has the correct resistance and it are changed when warming\cooling.
If i shorted any of t pins - the marlin firmware catches this case correct and throws the MAXTEMP triggered error

[radek8]

Send the configuration files.

[KnYaZuK]

@radek8
https://github.com/KnYaZuK/Marlin/tree/kossel-212
https://github.com/KnYaZuK/Marlin/tree/kossel-2095

[KnYaZuK]

Just a little update. The new skr 1.4 (not turbo) board has arrived. I have installed the Klipper firmware with default config for skr 1.4 and changed the thermistor to the apropriate type ATC Semitec 104GT-2 and everything works fine. The temperature shows the ambient value.