HP AIO 24-f0015nl not powering on

[dariuxzy]

Hey, I had a problem with this all in one hp. While I was using it, the computer suddenly shut down and wouldn't turn on again. There is no light flashing, only the power light in the back is on. I did various tests and various measurements, and I found that mosfet measures 19v at the input but does not output 5v. I changed it, but nothing.I checked if there was voltage coming to the bios but nothing is coming. What else should I check? Unfortunately I can't find any wiring diagram

DAN97RMB6D0 REV D

[SMDFlea]

You circled a mosfet. Are you sure its the right way around, where does pin one go

[dariuxzy]

You circled a mosfet. Are you sure its the right way around, where does pin one go

Sorry, I wrote it wrong...😴
In any case, the position of the mosfet is correct. It seems backwards but I also took a photo of the old one

[dariuxzy]

Please anyone can help me?
mon2

[mon2]

Remove all power. Locate the USB connectors. Locate any website with the USB connector pinout. Measure the resistance to ground of the VBUS pin of each USB connector. Have seen it more than once where the USB connector takes out the logic board. Checking for a low resistance to ground of the USB connector which often means a defective USB load switch. Start with this review and then go back to the main DCin power path and check the resistance to ground of each component along the way.

PS: Do not really frequent this side of the website but do in the laptop forum. Best to PM to send an alert.

[dariuxzy]

Remove all power. Locate the USB connectors. Locate any website with the USB connector pinout. Measure the resistance to ground of the VBUS pin of each USB connector. Have seen it more than once where the USB connector takes out the logic board. Checking for a low resistance to ground of the USB connector which often means a defective USB load switch

I have 2 USB 2.0 and 2 USB 3.0 ports. I checked the VBUS and they are very similar to each other. The only difference is that the D+ of one of the two USB 3.0 ports has a much lower value than the other.The first USB 3.0 port have D+ (01.6)
The second USB 3.0 port have D+ (80.2)
Could this be a problem?

[mon2]

Each value should be posted with the units of measurement. Is it ohms, kohms, megaohms?

Remove all power. Meter in diode mode.

Red meter lead, yes red to ground.
Black meter lead to the point to test.

Repeat your measurements and post each for a review. For diode mode testing, the units will be volts.

[dariuxzy]

Each value should be posted with the units of measurement. Is it ohms, kohms, megaohms?

Remove all power. Meter in diode mode.

Red meter lead, yes red to ground.
Black meter lead to the point to test.

Repeat your measurements and post each for a review. For diode mode testing, the units will be volts.

1 USB 3.0:
VBUS 2.850 megaohm
D+ 1.5 ohm
D- 1.6 ohm

2 USB 3.0:
VBUS 2.860 megaohm
D+ 15.4 ohm
D- 89.9 ohm

1 USB 2.0:
VBUS 1.243 megaohm
D+ 5.3 ohm
D- 1.810 mega ohm

2 USB 2.0:
VBUS 1.245 megaohm
D+ 9.3 ohm
D- 1.774 megaohm

[mon2]

1 USB 3.0:
VBUS 2.850 megaohm
D+ 1.5 ohm
D- 1.6 ohm

2 USB 3.0:
VBUS 2.860 megaohm
D+ 15.4 ohm
D- 89.9 ohm

1 USB 2.0:
VBUS 1.243 megaohm
D+ 5.3 ohm
D- 1.810 mega ohm

2 USB 2.0:
VBUS 1.245 megaohm
D+ 9.3 ohm
D- 1.774 megaohm

Can you confirm that these measurements are indeed in OHMS? These are very low measurements. Respectively, start with the first USB3.0 connector and locate nearby parts that may be the USB load switch and/or ESD diode to protect this local connector. Share close up quality pics of such parts for a review. Ideally post the topside markings if they are not legible in the pics.

Would you have hot air tools + flux + tweezers? Next, after we can agree on the parts onboard, such parts should be removed off the board with flux and hot air tools. Then measure the same resistance to ground of the D+ / D- lines on this USB 3.0 connector. Hoping that some component in the path from the PCH to this connector is defective to cause such a low resistance reading. Otherwise, the PCH = CPU is dead. The USB host controller is internal to the CPU/PCH single device.

[dariuxzy]

Can you confirm that these measurements are indeed in OHMS?

Yes

Would you have hot air tools + flux + tweezers?

Yes, I have all


What should I remove? These are the USB 3.0

[dariuxzy]

mon2 please help me. Thank you!

[mon2]

See attached. Suspecting these are the onboard ESD diodes. Remove all power. Meter in resistance mode. Place one meter probe to ground - use the single pin on the same 3 legged part in the attachment. That is, often, the single leg goes to ground while the other 2 legs are used to protect the data lines from an ESD (surge) event.

Place other meter probe onto any of the yellow arrow legs. Do you see a resistance like you have posted in your earlier posts? If yes, then this 3 legged ESD part may be defective and should be fluxed and removed. After the part is removed, test the resistance to ground again of the USB pins like before. Has the resistance improved? Post each measurement.

As noted earlier, the PCH (CPU) contains the USB host controller. It is possible that the PCH is defective which will make this a no fix case. However, have seen many times where just these ESD devices and/or USB load switches cause the logic board to not boot. These ESD devices are under $0.10 USD each.