Need help troubleshooting

[DocGreen]

Just installed motherboard #4 into this laptop... still dead. What am I missing here? I refuse to accept that all 4 of the motherboards we've tried were faulty in the exact same way as the original, so logically it has to be something else... but what could it possibly be?

I've tried disconnecting the laptop display, and still don't get any output on the HDMI.
I've tried removing the RAM, and still don't get any POST beeps.
I've tried powering it on with everything but the power button, DC input, and keyboard/touchpad disconnected, and I still get nothing.

I'm at a loss.

 

[NviGate Systems]

These are Windows 8.x models so you will not get HDMI output until Windows loads, it's a UEFI thing on laptops.

Are these boards still used pulls? I've stopped ordering main boards for clients because the DOA rate for these boards is extremely high.

Without schematics to see where the logic paths are, it's hard to say what would be wrong. You could have a component that is defective and affects the operation of the unit, so in effect, it could be that the original board may in fact not be defective but rather, a subsidiary component.

I'll give you an example: In MacBooks I learned the battery icon on the side that you press for your current battery charge state, is connected to the charge circuit. If that battery led status is defective, it affects the rest of the circuit because it's part of the circuit.

In this HP I would say you have some component that is part of a circuit that is critical and it's not operational. I think that HP should have PCI-E Mini, if you get one of those laptop POST cards, it might give you an idea where it's stalling.

 

[HFultzjr]

http://www.ebay.com/itm/HP-M6-W103d...096053?hash=item3d2b4744f5:g:wLUAAOSwGtRX0bUO

This one at least will post. Maybe create a Frankenstein of the 2.
Personally, I would just say it's going to cost more than a new or refurbished one and let go.

 

[Pete]

Power supply checks as good?

 

[TurricanII]

I had an issue with a foldable lenovo. Does the screen fold back to turn into a fat tablet? Try opening all the way and then closing fully again then opening the screen to 90 degrees. Is there another magnet pr switch that is 'telling' the laptop that the screen is closed and therefore preventing it from powering on?

 

[DocGreen]

Personally, I would just say it's going to cost more than a new or refurbished one and let go.

Yeah, I finally convinced the customer that it was a lost cause. He's going to buy a new one, and have me migrate all his data/programs over.

Are these boards still used pulls? I've stopped ordering main boards for clients because the DOA rate for these boards is extremely high.

According to the ebay listing, it was a "new pull": http://www.ebay.com/itm/232133731152?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT#viTabs_0

I think that HP should have PCI-E Mini, if you get one of those laptop POST cards, it might give you an idea where it's stalling.

Thanks for the tip, I'll have to grab one of those for next time.

Power supply checks as good?

Yep

I had an issue with a foldable lenovo. Does the screen fold back to turn into a fat tablet? Try opening all the way and then closing fully again then opening the screen to 90 degrees. Is there another magnet pr switch that is 'telling' the laptop that the screen is closed and therefore preventing it from powering on?

Yeah, I did notice magnets in the case, but I didn't notice any connection to them on the motherboard... I'll have to look again. Could they be connected through the display?

 

[Ktex]

A couple of years ago I had an issue with a Beats Audio DV6-3000 series laptop, windows 7. Like the OP said, it turned on for a few seconds, no video, fans turned, dvd player clicked, and then turned off. In sequence, I replaced MOBO, CPU, and screen, and even with no peripherals it would still turn off. The only part in common? Power button has its own little daughter board... Replaced it and voila, everything worked again. Proved useful since then, I have had at least a couple with that same issue, all DV6's.
So look to what part was in common in all instances, little parts are easy to overlook.