@ESP_Sprite Sorry for late reply. I saw your reply yesterday because this forum ui confused me a little and your reply was on the page 2 and I thought all the replies will be in the same page.

I bought a USB logic analyzer, i dont know how to debug it with this board. can you guide me or give me ...

Nothing on the OLED too...

@ESP_Sprite I tried but still no data from any sensors.

@ESP_Sprite any thought on this behavior

No I haven't connected anything to board. I have powered up the board through USB. From debugging what i got to know is SDA value is always 0 and SCL value remains 1.

@ESP_Sprite
Board : Esp Azure IOT kit
It has temperature/humidity, light, motion etc,., sensors. Everything was working perfectly working when i bought it.
I flashed a example code from esp-iot-solution repo and suddenly led stopped working, now all the sensors stopped working.
when i scan for i2c ...

I used esp32_azure_iot_kit example code from this repo.
I tried using esp_tool to scan for available devices, Except OLED ( addr: 0x3c ) other sensors are showing up. Below is the result on i2cdetect

Scanning I2C Addresses
.. .. .. .. .. .. .. .. .. .. .. .. .. .. 0E ...