Hello.
Having issues with an HP ZV5000
About 2 months ago, an aging 14.8 volt 6.0Ahr HP battery was replaced with a new 14.8v 6.6Ahr unit. About a month afterwards, the unit began shutting down right after turning it on.
On A/C power only w/ no battery, the unit does not power on but instead a very quiet clicking noise & high pitch whine is heard from the area of the a/c jack/cooling fans. The LEDs blink dimly with this noise.
On battery power only w/ no a/c, the unit turns on long enough to engage both cooling fans, blink the LEDs, then shut down. The faint clicking is not heard.
On battery + a/c power, the unit usually turns on long enough to display the HP logo, activate LEDs, engage fans, and then shut down. The clicking sound is not heard.
I have checked the A/C jack for melted solder points, switched old & new battery, attempted boot w/o harddisk, and looked for dust inside the unit (fans, heatsinks, ect all vry clean). I’ve also verified the PSU by plugging it into a compaq laptop with similar voltage input specs, it worked.
It seems this is a mainboard issue, but I’d like to identify which components are damaged, and the cause.
What symptoms might a bad voltage regulator have?
Any help you can provide is appreciated, repair quotes have simply been too much. My goal is therefore to fix the unit, and prevent reoccurance.