Earthblog

In this example we are reconditioning a HP Compaq nc6000. This is one of our most popular models. Every nc6000 we recondition is stripped into its individual components as shown below.

Step 4 – Fresh heatsink compound

This is necessary when the original compound has gone dry and is operating less efficiently, offering less of a heat exchange between the processor and heatsink. Original compound is removed and fresh compound is applied ensuring maximum heat dissipation to the heatsink.

Step 5 – Cleaning the touchpad assembly

Often dirt and grime builds up at the edges of the touchpad – this hinders pointer accuracy and often causes a glitchy pointer which keeps bouncing back to its previous location – very annoying.

The touchpad is removed from the palmrest and thoroughly cleaned. Ribbon cables are also re-seated.

Step 6 – CMOS Battery Testing and Replacement

Another important step – especially on certain models such as the nc6000 where battery replacement involves stripping the laptop down to get to it.

CMOS uses volatile memory which requires a small amount of power to retain system settings as well as the time and date. A laptop with a low or dead CMOS battery will constantly loose its time and prompt at invalid settings during startup.

We have built a custom CMOS battery tester which enables us to plug battery modules straight in for voltage testing.

The accepted voltage for a CMOS battery is > 2.8 volts, anything below this the battery is replaced for new.

In this case we have replaced the battery with a new one anyway which is showing a more healthy 3.33 volts. This battery will not need replacing for a long time.

Step 7 – Panel and Cover Replacement.

In this example, the previous corporate owners of this laptop have glued an asset tag onto the lid of the laptop. Asset tags mark the laptop as company property and are often put on with very strong glue – almost impossible to remove without further damage.

In this case we will be replacing the laptop lid with another one in better condition. This process will also be performed for badly scratched or worn lids, in fact also on any other part of the laptop in less than perfect shape.

Step 8 – Reassembly

Once we are happy with the integrity of the internal components the laptop is reassembled. All ribbon cables, daughter boards will be tightly seated and every screw will be as tight as when the laptop first left the factory.

Once the laptop is back together, it is fired up to make sure that everything is in good working order. Default BIOS settings are loaded as the CMOS battery has been replaced, new settings are updated and saved.

Step 9 – Software Installation

Hard disks are securely wiped using Blancco software which writes patterns of meaningless data onto each of the drive’s sectors. Any existing company data is relentlessly overwritten with random binary ‘1’s and ‘0’s making the possibility of data retrieval impossible. This process can be repeated many times depending upon the level of security the data requires.

Step 10 - Testing

Testing of a laptop is integral to its reliability and our customer satisfaction. From our extensive experience with laptops we have put together a batch of tests which will surface inherent hardware defects. Testing is carried out over a period of between 10 hours to 2 days.

Batteries are tested for one hour with all power management options disabled (ie laptop permanently on). If the battery is depleted before the 1 hour is up, it is replaced. Usually a laptop will have half a charge left after this 1 hour is up indicating an estimated battery time of 1.5 – 2.5 Hours.

Batteries are consumable items and are not included in our warranty. This is due to the possibility of the life of a battery being shortened by user error (ie leaving on charge 24hrs a day).

Several burn in tests are performed to ensure perfect system function. These include:
Memory testing – 1 – 1.5 Hours:

• Test 0 [Address test, walking ones, no cache]
• Test 1 [Address test, own address]
• Test 2 [Moving inversions, ones&zeros].
• Test 3 [Moving inversions, 8 bit pat]
• Test 4 [Moving inversions, random pattern].
• Test 5 [Block move, 64 moves]
• Test 6 [Moving inversions, 32 bit pat]
• Test 7 [Random number sequence]
• Test 8 [Modulo 20, ones&zeros]
• Test 9 [Bit fade test, 90 min, 2 patterns].

Processor and chipset burn in testing – 1 – 1.5 Hours

Shock testing – exactly what it says on the tin, knocking the laptop and checking for system lock up’s and hardware malfunctions.

Optical Drive – Tested for CD read, DVD read, CD write or DVD write if necessary.
All USB Ports tested – Checked for breaks and tested for functionality.

Wireless Network connection tested – Often we perform this test during the battery test procedure. We use CMD and the Ping command to constantly send 65500 bytes of data to our test router

The router then replies. This tests the integrity of the wireless card and will log any drop-outs or connection problems.
LAN RJ45 connections are also tested, although this connection is used for driver installations and so any connection issues would be pronounced.

Step 11 - Cleaning

Once a laptop has passed our extensive testing regime it is ready for cleaning.

We use an anti smear multi-surface cleaner which in anti-bacterial and it tried and tested by ourselves as it offers the best results. No residue is left on the screen and it is left crystal clear and in pristine condition.

Micro brushes are used to remove trapped dirt from the grooves in the laptops plastics as well as a soft brush which removes dust and fluff from underneath the keys. Even the ports are cleaned.

Not an ounce of dirt will be found on any of our laptops. Inside or out!