fzabkar wrote:
SY8089A1, Silergy, stepdown converter, marking qHxyz:
https://www.silergy.com/zh/download/downloadFile?id=3756&type=product&ftype=datasheetCheck the devices connected to the output side of the inductor. They could be overloading the IC.
Thanks! Out of curiosity, how did you manage to find the component based on the marking alone? I searched for quite awhile and couldn't determine what it was. Maybe I'm not searching properly or not using the right resource.
As far as the output side of the inductor, the only components connected to the output of the inductor is another inductor, 3 capacitors, and a resistor. The inductors are good and none of the caps are shorted. Resistor measures at 100k. Going further down the circuit, it leads directly to the NAND.
SY8089A1 Pin 3 (LX) ---> L1 inductor ----> capacitor and L2 inductor share output side of L1 -----> L1 inductor ----> 2 capacitors -----> 100k resistor ----> NAND
The other components seem ok and there are no shorts on them, so I am assuming this SY8089A1 is the culprit. I really quickly drew out the circuit to show the other components. Unless I am overlooking something, it seems I probably just need to replace SY8089A1, right?
Attached pic and the component on pic 2 is the 100k resistor