hp omen 15-dh1015nl does not turn on

[Sephir0th]

Looking at the PU301 diagram i think it's a problem also having 0V at pin1 and 6. Am i correct?

It is impossible to have voltage at Pin 2 - 5 but not at Pin 6. They all are connected together.

But yes, the Missing Enable at Pin 12 is a problem.

[giulio93]

It is impossible to have voltage at Pin 2 - 5 but not at Pin 6. They all are connected together.

But yes, the Missing Enable at Pin 12 is a problem.

In the datasheet pin6 is not connected to pin2-5

[Sephir0th]

My fault this time. Have confused the pinout with a different Controller...

So yes, missing voltage at LX, just means the Buck converter is not working. But this was already clear, since it is not even being enabled.

[giulio93]

I tried to inject 3.3V at the missing Enabling signal and nothing happen. The EN2 Is generated by I/O chip, correct? Of yes, how can I/O chip can generate this signal if It Is not powered?

[giulio93]

My fault this time. Have confused the pinout with a different Controller...

So yes, missing voltage at LX, just means the Buck converter is not working. But this was already clear, since it is not even being enabled.

considering the trial I did, now i order some of this chip to try the replacement way. What do you think? No changes also with the EN1 up (externally given)

[Sephir0th]

I tried to inject 3.3V at the missing Enabling signal and nothing happen. The EN2 Is generated by I/O chip, correct? Of yes, how can I/O chip can generate this signal if It Is not powered?

EN2 isn't generated from the EC. It is build via a voltage divider from the main power rail as source

And the EC is for sure powered, because this is what the EN2 does, powering up the 3.3V LDO (PIN17 ) supplying the EC, except you have missed a short to GND there.

[Sephir0th]

considering the trial I did, now i order some of this chip to try the replacement way. What do you think? No changes also with the EN1 up (externally given)

Makes no sense to me that the controller has a problem. If there is no EN1, it is not supposed to power up the buck converter. That nothing happens from manual injection is strange though. You are sure you have excluded a short to GND on thie +3VALW too?

[giulio93]

EN2 isn't generated from the EC. It is build via a voltage divider from the main power rail as source

And the EC is for sure powered, because this is what the EN2 does, powering up the 3.3V LDO (PIN17 ) supplying the EC, except you have missed a short to GND there.

I've measure all the caps around the EC chip (little doubt: the EC chip and I/O chip are the same thing, right?) and there were no voltage. I will now measure at pin17 of the EC chip and tell you the value.
Where is the +3VALW pin? On the EC chip or the converter?
Thanks

[Sephir0th]

I don't know what you call I/O chip. The EC is the embedded controller, typically a big IC with 128 pins or in small square a BGA package

You ere advised to measure Pin 17 at the 3V controller, not at the EC.

The LX pins of the 3V controller are literally (connected to) the +3VALW.

Didn't you took a look to the screenshot of the schematics above?

[giulio93]

I don't know what you call I/O chip. The EC is the embedded controller, typically a big IC with 128 pins or in small square a BGA package

You ere advised to measure Pin 17 at the 3V controller, not at the EC.

The LX pins of the 3V controller are literally (connected to) the +3VALW.

Didn't you took a look to the screenshot of the schematics above?

PIN17 is at 0V
And i remeasure all the caps around the EC chip and they are all at 0V. I don't understand why you sayng the EC chip is powerd

[giulio93]

PIN6 is about 20Kohm to ground (going down, i supposed couse af a charging cap)

[Sephir0th]

When you have voltage at EN2 (PIN 11) present then the (3V) LDO (Pin 17) should have power. As simple as that. If this is not true, then there is a problem (e.g. short to GND) on the LDO rail or the Main power rail is missing (again).

You should concentrate on that instead of randomly digging around without any structure. After 5 pages full of text it's slowly time to make some progress, you don't think so?

[giulio93]

When you have voltage at EN2 (PIN 11) present then the (3V) LDO (Pin 17) should have power. As simple as that. If this is not true, then there is a problem (e.g. short to GND) on the LDO rail or the Main power rail is missing (again).

You should concentrate on that instead of randomly digging around without any structure. After 5 pages full of text it's slowly time to make some progress, you don't think so?

The main Power rail Is present and PIN17 Is not shorted to gnd (and also pin6 Is not shorted to gnd)

[Sephir0th]

Do us a favor share a new picture of this exact controller including the surrounding circuit. A clear and high quality close-up please. Thanks.

[giulio93]

Do us a favor share a new picture of this exact controller including the surrounding circuit. A clear and high quality close-up please. Thanks.

Like this?

[Sephir0th]

Like this?

Measure resistance to GND and voltage at this cap.

[giulio93]

Measure resistance to GND and voltage at this cap.

Just 2.7 Ohm. you were right! So the pin17 rail Is shorted to gnd.. to find the shorted components i can inject 1V in this cap and see what goes hot, correct?

[Sephir0th]

Yes, there will most likely appear the embedded controller being shorted.

[giulio93]

At 1V and 0,4A the EC goes up to 40°C.
I don't think its normal. There Is amy chance that the coulprit Is not the EC chip but something else?

[Sephir0th]

No. Possibly something in addition. But the EC per 100%