If you realized HP Elitebook 840 series have been failing a lot in recent years, which I think is due to time since they have been in existence for almost 10 years. Today I decided to share a video demonstrating how to disassemble, diagnose and fix an HP laptop that does not turn on or charge.
This is very common, where a laptop standby voltage control IC fails to create first stage volts that enable the system to power on.
The chip I replaced is called TPS51225, it's very common in laptop motherboards with 4th Gen processors, like HP 820, Dell 6440, etc.

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