HP OMEN. Comes on and nothing-nothing. RT3663BM. no pwrok.

[bociub]

Hi There

I am intended to fix a hp laptop. Charges the battery, pressing the power button and starts and stays on, fans lightly spinning and the bench power supply shows that nothing happens after pressing the power button. Measuring the coils showed that there is no voltage on the CPU. Soon I discovered on the other side of the board an IC : RT3663BM. This chip should manage the gates. leg #19 should have voltage if power ok. there is nothing. Where this pwrok signal coming from? In what circumances the power is ok? Any idea where to go next? other voltages and resistances are fine ( at least looks fine). thx

[mcplslg123]

Dont jump and overshoot. This IC is supposed to relarease Vcore for CPU but there must be so many rails/signals which should be up and running before. Any of these preceding rail fault,will halt the process.

Link the schemaatic if available on this forum.
Mention all the rails which are present/not present.

[bociub]

HI

The chip's manufacturer published the details, and how this chip supposed to work/start up. I collected onto the black and white image, how this chip starts and where to measure them. The pwrok is the fifth step on that long list of the startup. Maybe this could save some time for someone.

There is an example implementation on that document. In that very first step of the startup, the chip should get 5 volts on two different pins. On my chip, the VCC gets 2.6 volts and nothing on the PVCC. I tried to find out where this should come from and on the other side of the board I found a couple of missing components.

Does anyone know what those components could be?

thx

[mcplslg123]

What is the voltage on both pads of missing item(after power on)? Check whether one end is ground or not. It may be a resistor or caps but cant be sure without boardview.