HP EliteBook 820 G3 doesn't start

[AlvaroGR]

The laptop doesn't boot up anymore. It has drain the battery while on sleep mode and now, when I connect the power cable the charging light turns on white but then it blinks 3 times in orange and the sequence restarts again. I can not start laptop and I don't see any image. I have tried to remove all the possible HW, switch with working RAM modules and nvm2 SSD. I also tried to remove the internal battery for "restart" the BIOS but any of this helps.

I also tried to charge the laptop during a couple of days with either the original dock-station and the original charger and with other chargers but same result.

Can someone give some light?

Thanks

[WAWood]

Sorry to tell you this, but with some laptops, when the battery dies, the laptop simply will not start anymore, even with a charger connected, until you replace the battery.  Sounds like this is what is happening to yyou.

You need to go online and using the part number printed on the battery, see about buying a replacement.

But be advised, this might NOT fix it because the charging circuit in the laptop might also have gone bad and you won't know that until you put a new battery in it, one that is not fully charged, and notice that it does not charge up to the full level.

[AlvaroGR]

Hi WAWood,

I replaced the battery with one brand new and the problem is still there. As you say, looks like the power circuit of the motherboard is dead. I wish I could find the motherboard schematics so I can look at what component is broken and replace it 

[WAWood]

HP does not manufacture their motherboards; instead, they pay others to do that -- and the schematics are considered proprietary information, so they do not release them to the public.