HP EliteBook 8760w - No CPU VCore

[Johndill]

Re: HP EliteBook 8760w - No CPU VCore

to test the old card, first check whether the tantalum capacitors or the coils are shorted or not. but probably, the gpu chip should be failed.

All the coils and black caps are beeping on either side of them with continuity test whether the card is in the board or out.

The coil with the blue dot is 63ohms on both sides, every other one in red is around 0.2 - 1.8ohms.

Ground point used circled in yellow.

[caspian]

Re: HP EliteBook 8760w - No CPU VCore

1 ohm and less indicates a short. since the mxm card is already broken, you can inject voltage to find the shorted component. but spending time on a card for which you have no schematics, does not worth it, because the probability of fixing it is low.

[Johndill]

Re: HP EliteBook 8760w - No CPU VCore

Thank you guys for the help once again, luckily my board was ok and it was just the MXM GPU so an easy diagnosis :-D

[SMDFlea]

Re: HP EliteBook 8760w - No CPU VCore

If you buy a new or used card the only problem you might have is with the vBios if its from a different vendor.
You can run a few simple tests without injecting volts. To test the smd caps dab some crayon onto them,if one is short/cracked the crayon will melt,you only need to power the laptop for 10 seconds or so,just long enough so that the crayon doesn`t melt on them all.The coils and large caps can be replaced one at a time with a good one,or more from a donor board or all at the same time if can get enough.An easy way to desolder the coils and large caps is using 2 soldering irons.