Am working on hp 840 g3

[sullysys]

Am working on hp 840 g3.it powers once I plug the adapter ,after that it will not power.
I notice am have 1.4v in the power button instead of 2.4..please any idea on how to fix it
No schematic..

[reformatt]

Re: Am working on hp 840 g3

I've had some dealings with these boards. Unless its a shorted cap, they aren't the easiest to work on especially since there is no publicly available schematic. There are two coils near the SPI EEPROMS that should measure +3.3V and +5V so you can start there. Check LDO outputs of the converters for shorted caps etc. Thermal camera helps.

I sometimes just buy a 2nd hand unit (cheap) and steal the board out of that if it's anything more complicated.