Re: HP 840 G6 Laptop CRESCENT-6050A3022501-MB-A01(A1)


1.2v is present but it is likely EC is missing powergood state from 1.2v or something similar to enable power to the cpu, and may need to be examined carefully. because no schematic available yet....

Re: HP 840 G6 Laptop CRESCENT-6050A3022501-MB-A01(A1)

the one near power jack is 12v bus supply and battery charger it should be ok. the other near the battery, you need to check it further for something shorted caps or it may doing overvoltage. if there is switching activity at mosfet side of inductor and no voltage at the output,
something is shorted. if the output present probably an overvoltage protection switch off the system.
edit: sorry I forgot it. if fan is spinning fast while the processor is off. probably something is wrong in pch or ec. warm inductor could...

Re: Thinkpad x230 dead. Thinkengine IC issue?


It is better to check its voltages before replacing it. the chip is supplied from vint20. when it is present cp25out must be able to switch the input mosfet on. if it failed to reach 25v may be the mosfet is shorted and think engine choose to stays off.
The 2nd check the thermal sensor, I don't know what is this chip do but may be thermal ntc failure is affecting the system.
the 3rd i can't find what inside the thinkengine track out the posibly shorted pin. like cp12 or cp15pin...

Re: HP 840 G6 Laptop CRESCENT-6050A3022501-MB-A01(A1)

May be try to fix its bios battery. 10watts is hot, may be you can find something from it.

Re: hp elitebook 840 g3 battery present but not charging

Another schematic or chip datasheet may help. Sometimes dead mosfet causing this problem if there is internal chargepump of the chip failed to turn another mosfet on, because the dead mosfet short it.