HP Omen 16 no boot (MODEL: G3KR / DAG3KRMBCD0 REV: D)

[techrepairheide]

Hello again,

got an gaming laptop HP Omen 16 with no boot. LED goes orange with dc jack and battery in and white LED without battery. After pressing power, the laptop doesn´t boot up. Only fan starts to spin fast for 3-4 seconds and shuts off immediately and a coil whine is coming up in a rhythm. Without the RAM the fan is spinning continuously but no coil whine. In both situations with or without RAM, there is a chip "8XXDEE" (see attached picture) which is getting hot and under thermal cam I can see the temperature raises very fast up to 67-68°C.

The motherboard is the model G3KR / DAG3KRMBCD0 REV

The problem is, I don´t know what this chip does and whats his purpose and I can´t find any schematics or boardview.

I already measured for shorts near the chip, but I think it´s the chip by itself.

Does someone know something about this chip, maybe a name and what it does, so I can order a new one? And has someone schematics or bordview files for this laptop or maybe similar files?

Thanks in advance.

[mon2]

It is a regulator from SILERGY with part # BXX*** = SY9329CQFC

https://www.aliexpress.com/w/wholesa....home.search.0

https://www.atombilgisayar.com/sy932...fEMH9JYheE7Ulk

[rddube]

What's the resistance to ground on pin #9 vcc ?

[techrepairheide]

With the information from mon2 about the SY9329CQFC I found block-diagramm, pin-out and datasheet of similar chip too. Under thermal cam it looks like the PIN9 goes hot, but I measured this pin and I got 3,3V with power on. I removed the chip and without it, the laptop is booting fine now. So I think the issue is probably a short circuit inside this chip. I ordered new one of SY9329CQFC via AliExpress. I live in germany and I think the delivery needs one or two weeks. Hope this chip is really the culprit and not only just a problem that I isolated by removing it. I don´t proceed to test it further, because I don´t know where the output should go in and how much voltage should it be. Maybe a circuit for fan, usb or something else?

Is it possible that an internal resistance inside the chip is bad (maybe too low because of an issue) that is resulting in too much power/current and no boot, despite the 3,3V on pin 9? Because it's only for the chip itself.

[rddube]

You might want to take a look at the schematics and try and find in which area the chip is. Could be one of it's outputs that is shorted ?

Link to schematic - https://www.badcaps.net/forum/troubl...cs#post3582136

[techrepairheide]

In that schematics, there is only one chip SYV269CQFC with same pinout, and it has VIN as input and +12V_FAN as output. Apparently it's the same in my case and provide 12V for the fans too. I already measured the output pins with no short. Now I must wait until the parcel with the new chips arrive, and then I can give feedback if that was the solution.

Thanks for the schematics.

[SMDFlea]

You might want to take a look at the schematics and try and find in which area the chip is. Could be one of it's outputs that is shorted ?

Please post the schematic in the "Schematic requests ONLY!" sub forum, where other members will be able to find it https://www.badcaps.net/forum/troubl...-requests-only

[rddube]

In that schematics, there is only one chip SYV269CQFC with same pinout, and it has VIN as input and +12V_FAN as output. Apparently it's the same in my case and provide 12V for the fans too. I already measured the output pins with no short. Now I must wait until the parcel with the new chips arrive, and then I can give feedback if that was the solution.

Thanks for the schematics.

Was your fan plugged in when you checked the mb with a thermal camera? Could be your fan that is shorted? Also, how did you measure the output pins with the chip already removed ?

[rddube]

Please post the schematic in the "Schematic requests ONLY!" sub forum, where other members will be able to find it https://www.badcaps.net/forum/troubl...-requests-only

Ok, will do.

[SMDFlea]

Thank you .

[techrepairheide]

Was your fan plugged in when you checked the mb with a thermal camera? Could be your fan that is shorted? Also, how did you measure the output pins with the chip already removed ?

Measured the output pins in diode-mode with no short to ground, before I had desolder the chip. And yes, I checked under thermal with all parts connected, removed parts piece for piece and even with only motherboard and dc-jack, the short was there and chip was getting hot. After I removed the chip, the laptop is booting fine.

[rddube]

Measured the output pins in diode-mode with no short to ground, before I had desolder the chip. And yes, I checked under thermal with all parts connected, removed parts piece for piece and even with only motherboard and dc-jack, the short was there and chip was getting hot. After I removed the chip, the laptop is booting fine.

The only reason I am asking is that removing the chip and the laptop boots doesn't mean the chip is bad, it could just be making the connection to a shorted area of the MB. You've got voltage coming in on pins 1, 2, 3, 4, 5, and 32 with a bunch of capacitors on those pins, check that there is no short there with the chip removed. Check all other pins except 33 which is ground to make sure there is no short anywhere else. There is another bunch of capacitors on the output lines (pins 20 to 25). Been there, seen this as you replace the chip with a supposedly new one (depends where you ordered it) and you are stuck with the same problem.

[techrepairheide]

Hello,

I think that´s a weird case.

Today the parcel with the SY9329CQFC was delivered. I quickly reflowed the new chip onto the motherboard, attached all wires, fans, keyboard, RAM and so on (but not the battery) and pressed the power button. The fans started to spin and the laptop booted properly. So I assembled the battery too and with power supply in, the orange charging led turned on. Now, after I pressed the power button, the laptop booted too, but the coil whine is back. So I took out my thermal cam and the components, which are red marked, are between 95-110°C hot. When I detach the power supply, the temperature cools down to the supposed normal values and no coil whine.

So:

- Power Supply without battery = white light and no problems / Battery without power supply = white light and no problems / Battery with power supply in = orange light, coil whine and hot components and cools down and no coil whine after detached power supply
- Good diode values on marked components between 0,3-0,5V
- Measured 2,2ohm between the marked resistor / No short to ground with black probe on ground and red on resistor
- Measured 11,5V with battery attached on inductor/coil and on all other components on that rail
- Measured 13,2-13,6V with power supply and battery attached ...

That is crazy! It looks like there is no problem with charging and booting, except the hot components. Even the test mode, which is integrated into the recovery mode (booted it without hard disc) shows battery status, logic state and charge state "OK".

Near the marked components there is a BQ-chip and I think it´s a charging controller similar to Nintendo Switch or other devices. Maybe that chip is giving false/to much current? Maybe the mosfet near components is faulty and the culprit?

I think it makes no sense to remove the mosfet, when there is no short. Because good voltage is present.

[rddube]

Had that happen to me once and it turned out that it was the power supply not providing enough current - can you measure the current coming from your power supply? If not, do you have another power supply you could test with, one with higher amp rating? Also, I noticed in the photo you have circled a small capacitor that heats up. Did you try removing it?