DV9000 Power issues - Unit power on, but does nt restart until disconnnected from ac

[marcellodj]

Hello,
strange problem on HP DV9000 laptop;
unit starts and is full working,but when powered off, it wan t restart until dc jack is unplugged and reinserted.

Tested FDS 6679 and AO4407 and seems ok, may be a capacitor not discharging?

Thanks

[shuky]

Re: DV9000 Power issues - Unit power on, but does nt restart until disconnnected from

how do u test the fds6679 and ao4407 ?

[severach]

Re: DV9000 Power issues - Unit power on, but does nt restart until disconnnected from

The easy test is to check for shorts on the diode scale of a DMM. Check the datasheets. Some leads are supposed to be shorted. Some leads may be shorted by the surrounding circuitry. A more conclusive test is to pull the chip and test it with a Semiconductor Analyzer like the Atlas DCA55.

[marcellodj]

Re: DV9000 Power issues - Unit power on, but does nt restart until disconnnected from

@ shuky: using my meter in diod mode; i know is best to pull out the component and do measurements, but is so time consuming!!!

so i taken another identical board (working) and measured same components, identical readings.

solution: reflowed intel southbridge and the box back to life !!!

thanks everyone for attention,

regards

[bossapplesauce]

Re: DV9000 Power issues - Unit power on, but does nt restart until disconnnected from

Marcellodj - are you aware of the nVidia GPU defects effecting all of the HP dv9000 series units? The issue is with the BGA GPU become separated from the mainboard over time, and this causes issues with the WiFi, power on, video, etc.

They're settling a large class-action lawsuit that nVidia has agreed to replace many notebooks from Dell, HP, and Apple. Check this site for more info:

http://www.nvidiasettlement.com/