I purchased this HP notebook on Nov 11, 2019. It worked flawlessly for a year. On Dec 7, 2020, while I was working on editing a file, the computer suddenly went dead. No light at the wall wart plug. I unlugged the AC/DC adapter, tried to power up and got the same result, no reaction at all.
Since I was out of warranty by a month, I opened up the notebook and did a visual check. Everything looked just fne. I checked connectivity with a multimeter and found that the output stage of one of the CPU VCC regulators showed a short to ground. Suspecting that either the FET or the decoupling cap had given up the ghost, I pulled up a lead on the output inductor and found that the short remained on the CPU side and not on the VR side.
So, it is almost certain that there is a short in or under the CPU which is soldered down to the motherboard. I am an Intel retiree and have some experience with Intel CPUs. In 30+ years, I have never seen an Intel CPU develop an internal short to GND with no external indication of thermal distress. I am unsure about what the failure mechanism is or where the short is.
It appears that HP has built in protection for overcurrent on the voltage planes so that nothing on the board powers up anymore.
I write to ask is anyone else on this forum has seen similar issues. I note that there have been some other reports of similar failures but did not see any follow ups about successful diagnosis or repair.
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