Case study
Motherboard La-b972p

Problem- dead (dc connector ki light nhi jal rhi thi)

Testing- vin ok / step down coil pe voltage aarha tha jo ki is board me on hone ke baad aana tha.

Jis engineer ke paas se aaya tha usne charging ic, step down ic , aur 2 io chip badal ke dekh liya tha.

IO kb9012 thi..uska kahna tha io program nhi ho rhi hai.

Mere paas aaya to humne bhi phle yahi socha ke io program kare pahle...io detect nhi ho rhi thi..

To direct io ki pin 37 ec rst check kiya to zero voltage...

Phir io ki sabhi requirements check ki sab ok thi.

Boardview tha nhi..

Ecrst pe jo resistor tha wo mil nhi pa rha tha..kaafi der tracing kr li thi.

Phir io ki Ecrst ki pin no. 37 board se utha di...aur board se utha kar pin 37 pe 3.3v ldo se jumper kar diya..

Step down bhi suspend condition me aagya..

Board bhi on ho gya 😊