How to distinguish fake / cloned HP laptop AC charging power adapter from the original / genuine one

Go straight to the procedure

Issue

In this tutorial I will write about how to recognize a fake, copied or cloned HP laptop AC charging power adapter. I believe this is an important subject since low quality Chinese knock-off copies of HP power adapters can potentially overheat or malfunction and present a serious fire hazard. They are usually made from low quality materials, internal circuitry is simple and lacks proper safeguards (over-current, over-temperature and short circuit protection), any kind of product quality control seems non-existent. Power ratings on these things are made up out of thin air since these adapters are not capable of providing near the advertised power. Do not let the appearance of the adapter or even the HP logo on the sticker deceive you, these things are easiest to copy by the counterfeiters, but as you will see; the devil is in the details.

Tools required:


fake HP 90W power adapter
Fake HP 90W power adapter close up. Please ignore the custom warning sticker.

Original HP 90W power adapter close up
Original HP 90W power adapter close up.

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Laptop battery test with current amp measuring ammeter

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Go straight to battery’s capacity calculation

Go straight to simple battery functionality test

Issue

When the laptop’s battery doesn’t work as expected, there are ways to test it, without buying a new battery and later finding out, the problem lay in the laptop’s battery charging circuit. There are a few possible scenarios – battery’s capacity could simply drop below the designed rate over time, battery protection circuit could be activated, the laptop’s charging circuit could be faulty, communication paths between the laptop and battery could be open, charging power adapter could be faulty or not supplying enough current to charge the battery or a signal pin on power supply adapter could be broken and thus not properly identifying itself to the laptop.

Tools required:
  • GetGui DC charging adapter with ammeter
  • A charger tip, compatible with the brand and model of the particular laptop. It could be acquired via Ebay if it wasn’t supplied together with the GetGui charging adapter.

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HP G62 – CQ62 laptop faulty webcam-101 (not detected) repair or replacement

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Issue

I bought this notebook for a repair and resale. When I asked a seller about the laptop’s history, his reply was “It just stopped working”. As it later turned out, it had numerous problems, one of them being a faulty webcam. After the Northbridge chip replacement the laptop started working. During a testing process, I noticed the webcam isn’t working in Skype; there was no video and the webcam’s control light wasn’t lit. In the Device manager there should be a HP webcam-101 device under the imaging devices or at least an unknown device with an exclamation mark beside it (a possible driver issue).

HP-webcam-101-device-manager

Webcam’s absence in the device manager points to a hardware failure. There are four possible scenarios in cases like this, written from the most likely to less:

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