Hello
My trusty old HP Zbook 15 G1 died the other day. After disassembling it and fiddling around with, I found out that it's actually the nVidia Quadro K2100M MXM 3.0 type-a GPU card that is the culprit. Futher investigation lead to the realisation that the PWR_SCR lines of the card are shorted to ground.
Symptoms on the laptop.
When I connect the power supply, with no battery, the white led next to the connector flashes once. No other signs of life. After this the power supply does not work for couple of minutes, so I quess it goes in some sort of safe mode, because of the short-circuit/over current.
After removing the MXM card the system boots up normally.
I have measured the PWR_SCR pad's to ground on the card and they show 1.7ohm. I have not been able to find any schematics or boardview files for the MXM card.
Visual examination has not revealed anything obvious. I tried to measure the mosfets (CSD87350Q5D from TI, I think.) on the card, but to my understanding they are good. I have tried to inject voltage to the PWR_SCR and GND pad's and used isopropanol to find the short, but no luck. I only used 1V and 250mA.
What can I try next? More volts & amps? Is the 1V and 250mA enough? The thing is alredy broken anyway.
Any advices, tips or ideas would be much appriciated, as would be hints, where I could find schematics for the card.
I can take better pictures, if required.
My trusty old HP Zbook 15 G1 died the other day. After disassembling it and fiddling around with, I found out that it's actually the nVidia Quadro K2100M MXM 3.0 type-a GPU card that is the culprit. Futher investigation lead to the realisation that the PWR_SCR lines of the card are shorted to ground.
Symptoms on the laptop.
When I connect the power supply, with no battery, the white led next to the connector flashes once. No other signs of life. After this the power supply does not work for couple of minutes, so I quess it goes in some sort of safe mode, because of the short-circuit/over current.
After removing the MXM card the system boots up normally.
I have measured the PWR_SCR pad's to ground on the card and they show 1.7ohm. I have not been able to find any schematics or boardview files for the MXM card.
Visual examination has not revealed anything obvious. I tried to measure the mosfets (CSD87350Q5D from TI, I think.) on the card, but to my understanding they are good. I have tried to inject voltage to the PWR_SCR and GND pad's and used isopropanol to find the short, but no luck. I only used 1V and 250mA.
What can I try next? More volts & amps? Is the 1V and 250mA enough? The thing is alredy broken anyway.
Any advices, tips or ideas would be much appriciated, as would be hints, where I could find schematics for the card.
I can take better pictures, if required.
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