Please turned off the laptop and remove the battery before disassemble.

STEP 1.

Loosen two screws securing the back cover.

Under the cover you can see HDD, RAM modules and wireless card.

If you want to add a RAM or replace the HDD, it not a hard working.

There is a mini-sata slot near the HDD and wireless card, you can add a ssd with mini-sata slot in there.

Loosen one screws securing the optical drive, then you can remove it.

Loosen two screws securing the keyboard, you can see the a keboard remark beside the screw.

Now, you can remove the keyboard, but, a keyboard cable connect the keyboard and motherboard,  please do it carefully.

after remove the keyboard and top cover, you will see the motherboard and fan.

Try to power it on. Find a power cord, and plug it in. Power it on, and observe. If it doesn’t power on at all, something could be wrong in the case. If it powers on and beeps, something could be wrong in the case.  lenovo x220  keyboard If it powers on and disks whine, it’s probably fine so far.

Unplug it, and open the case. Even if it had no problems in step 2, open the case. You need to do a few things in here. If it didn’t power on at all, look at the power connectors from the PSU to motherboard. If they’re connected properly, then there’s probably something wrong with the PSU or motherboard, and unless you have replacements available, this computer isn’t worth it. If not, connect them properly. lenovo thinkpad x220s keyboard Look at the disk drive connectors. Are they upside down? Is a drive’s pin setting not correct? Correct it.

Clean it. Using compressed air, dust out the case. Dust the motherboard, cards, disk drives, power supply, any fans (especially the CPU fan on the motherboard), and the case around everything.

Look for broken parts. If the CD-ROM drive does not work, remove it. If the sound card is broken, remove it. If the graphics card is broken, remove it (and get another). If the CMOS battery needs replacement, replace it.

Replace what you removed (if possible or necessary). If there were broken RAM, it’s especially important that you replace them. If the hard disk was faulty, it’s also important. However, if the 56k modem wasn’t working, you probably don’t need to worry about it, as you will probably upgrade in the next step (don’t replace anything you’ll be upgrading).

Upgrade. If things can be upgraded, upgrade them. Upgrade the computer as far as possible. Upgrade RAM, hard disk(s), if you can, upgrade from CD-ROM to DVD, and if there was a 56k modem, upgrade it to gigabit ethernet or a wi-fi card, etc. Read Build a Computer for instructions on working inside the case.

Make sure it works. Make sure all the above steps have worked. Power it on and make sure you can boot to BIOS and can configure all of the hard disks (with an exception to some computers such as the Compaq Deskpro 2000, which do not allow you to access the BIOS directly).

Install an operating system. Use a modern Operating System for better features and security.
1 GB+ of RAM (Minimum) Windows 7
512MB of RAM (Minimum) Ubuntu Linux, Windows XP, Windows Vista

Install software. Not especially important, but installing software can make it more useful to you or make it more appealing to buyers.

If you’re selling it, include some stuff. Find at least a power cord, keyboard, mouse, and maybe a monitor, and include them. Include whatever you have left from when you bought it (if you don’t need it). If you have more, try including speakers, printers, a modem, a joystick, software disks, etc.

If you’re selling it, set a reasonable price. A good computer from the mid to late 90’s could probably sell for anything between $10 and $50. Find out how much you spent on it, then add your price for labor. So, say you spent 5 hours working on this computer at $2 an hour, and spent $15 on it in all (including buying the computer, unless you are the original owner), and you want to add an extra $5. Adding them together would be $30, so sell your computer for that, but be sure it’s worth it. No one wants to buy a computer with only 16 megabytes of RAM running Windows 3.1 for $30.

If you’re not selling it, use it. The only way that all that work will be worth it is if you use it. So, sit down and play a few old games, run some older software that was rejected by Windows 7, give it to your kids, use it as a router, take it to school with you, etc.

If you can find specific information about your computer at it’s manufacturer’s website, do so. This information can tell you what is known to work, what disk drives were included with it originally, how expandable the RAM is, etc.
Don’t be afraid to try external hardware if it is compatible. If you have a printer you’d like to try, try it.
This article discusses computers in general. Specific types of computer have tasks that are for it, such as laptops. With laptops, you might also consider upgrading the battery, keyboard, repairing broken latches on the screen, including a second battery or a carrying case, etc.

Remember where you removed parts from. If possible, lenovo thinkpad x220t keyboard try taking a photograph of the inside of the computer and keep it handy so you can remember where the parts go (just in case you forget).
When you include hardware or software with your computer, make sure it works. The hardware should be compatible, and the computer should meet the minimum requirements. The software should run on that operating system, and the computer should meet the minimum requirements.
Be careful working inside the case. A static electrical discharge could fry the whole computer.
Don’t spend more money than it’s worth. If the motherboard, CPU, or PSU is dead, and you can’t buy another for just 5 bucks, the computer probably isn’t worth it. Don’t give up, there are probably many people in your area with old computers that they’d like to sell for a few bucks, or, if you’re lucky, hauled away for free.
Don’t buy parts freely. Not everything is compatible with any computer, especially an old one.

Remove the 4 rubber supports from the screen. Then remove the screws underneath.

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With a spudger, release the clips that hold the plastic frame to the back cover.

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Be careful while handling the bottom part, specially with the hinges, as there are cables inside.

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When all the clips are out, the entire plastic frame should come out easily.

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Carefully disconnect the camera cable.

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Remove the 4 screws located in the sides of the LCD screen.

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Remove the other 4 screws that secure the metal LCD frame to the hinges.

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Take the LCD screen out of the metal frame and flip it towards the keyboard.

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Remove the tape that holds the display cable.

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Be careful not to take the entire tape away, as this may cause severe damage to the cable.

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NOTE:These errors are not predictable. If these errors occur only in one software program, the issue is probably related to that software program and is not heat related.
The following list describes some causes of excessive heat:
Dust inside the computer.
A new component, such as a hard drive, is added. The extra component causes the power supply to work harder and generate more heat. HP g62-340us fan Extra heat also radiates off the new component and adds to the temperature inside the case.
Over time, some cooling fans might slow down and wear out, depending on the usage of the computer.
High ambient room temperature.
Step 1: Remove dust and lint by cleaning vents

Notebook PCs have vents located around the case to allow air to flow through the case. If these vents become clogged or heat generating parts become covered with dust, Samsung NB30 Keyboard the fan cannot cool the components properly. Lint and dust accumulation prevents air from flowing around the cooling fins and causes the fan to work harder. If there is dust in the vents, you should clean the computer by blowing out the dust from around the fan and heat shield. This prevents dust from accumulating.
Figure 1: Dust accumulation

Figure 2: Dust accumulation around fan

CAUTION:Ensure that the computer is turned off and the AC adapter is disconnected before spraying with compressed air to prevent damage to the notebook PC.
Use a can of compressed air (a vacuum cleaner on blow function or a hair dryer in cool air mode can also be used, though the can of compressed air is better suited for this task) to remove dust from the computer’s vents and prevent overheating. Samsung NB20 Keyboard Removing the dust increases the air flow to improve cooling and allows the fan to run quieter.
The cooling vents are located in various places depending on the PC model. You can identify the vents by looking for the copper or black fins inside the vents. You should also blow the compressed air into Samsung N148 Keyboard other openings such as the fan intake vent to help keep the air circulating and prevent dust from accumulating on components.
Figure 3: Side vent

Figure 4: Rear vent

By taking this action periodically as a preventive measure, you can greatly reduce the possibility of component damage and prevent the slowdown of the computer’s performance.
Step 2: Ensure proper space for ventilation

Proper ventilation for the system is Samsung N148-DP03 Keyboard important for workstation operation. Follow these guidelines to ensure adequate ventilation:
Keep the computer upright and on a sturdy, level surface.
Provide at least 15.25 centimeters (6 inches) of clearance around each vent.
If the computer is being used at very high altitudes, above 1500 meters (5000 feet), take extra care to keep the computer cool. The maximum limit of 35 degrees Celsius (95 degrees Fahrenheit) drops 1 degree Celsius (~34 degrees Fahrenheit) every ~300 meters (1000 feet) of altitude. Samsung N148-DP04 Keyboard 
Step 3: Place the computer in a cooler room

A small difference in temperature might be all that is needed to prevent a component from failing. Move the computer to a cooler room in the house or office. If this is not an option, continue with the next step.
Step 4: Test for hardware failure

If issues persist after cleaning the vents and moving the computer to a cooler room, a hardware component might be damaged. Samsung N150 Keyboard Test the computer to see if any hardware, such as memory, the processor, or the graphics hardware, have failed. Most HP and Compaq notebook computers have diagnostic software to verify hardware failures.

Like its predecessor, the Eee PC 1201N, the 1215N offers a bright 12.1-inch LCD display with a native resolution of 1366 by 768 pixels. That moves the Asus from netbook to entry-level ultraportable, but the internals are all netbook-class components–albeit a high-end netbook.

The CPU is now the Intel Atom D525, a dual-core processor supporting Intel’s hyperthreading technology, typically found in small “nettop” desktop computers. It allows the system to handle up to four simultaneous process threads. The clock rate is also juiced up slightly compared to older Atoms, to 1.8GHz.

Although the D525 is a 64-bit-capable CPU, Asus ships the 1215N with a 32-bit version of Windows–Windows Home 7 Premium, which is a step up from most netbooks. Using a 32-bit OS makes sense in light of the 1215N’s 2GB of memory, even though the D525’s memory controller can support up to 4GB of RAM.

Asus builds the 1215N on top of an Nvidia Ion chipset, which offers more robust graphics capability than the integrated Intel GMA 3150. Graphics switch automatically between the Intel integrated graphics and the discrete GPU thanks to Nvidia’s Optimus technology. Despite having a faster, dual-core CPU and Ion chipset, the 1215N’s battery life lasts 5 hours, 24 minutes, over an hour better than that of the older 1201N.

The asus eee pc 1215n keyboard is also quite good, with the typing keys nearly full-size. Even better, each alphanumeric key has a slight depression, easing touch typing and making this one of the better keyboards I’ve used in this class of machine. The trackpad is another story. The pad itself is twitchy, and causes the mouse cursor to jump around, seemingly completely at random. The pad buttons require excessive pressure. You might want to get a laptop mouse if you will be using the 1215N extensively.

The larger display is great for normal desktop use–the higher resolution helps considerably when creating or editing documents. However, video proved to be disappointing. The Nvidia Ion graphics are capable of handling high-definition video quite well, and the HD video clips I viewed looked great, as did standard-definition video. But when I looked at video sequences with lots of action–sports, for example–the motion smearing on the LCD proved highly distracting. Viewing angles are also typically bad, but most users will be sitting in the sweet spot, anyway.

Audio turned out to be a pleasant surprise. As you might expect, the speakers offer zero bass content. But the overall tonal balance was mostly clean on vocal and acoustic instrumental content. Volume levels were quite loud for a small laptop as well. For more serious audio, you’ll still want headphones, but the speakers seem a cut above most small laptop speakers.

Performance is pretty much on a par with most netbooks, except for the scores on PC World’s game tests, which were boosted by the Ion graphics. Still, this laptop is good only for casual gaming, at best.

The unit includes plenty of ports. Two USB 2.0 ports and fast (10/100) ethernet and audio jacks are on the right side. A third USB 2.0 connector, plus VGA and HDMI, are on the left side. The 1215N also includes 802.11n, making the Wi-Fi connection theoretically faster than wired, but actual throughput depends on router load and distance.

In the end, the Asus 1215N blurs the line between netbooks and lower-end ultraportables. The bigger screen and solid keyboard give it an edge over most netbooks, but it’s also bulkier and heavier than most (it weighs3 pounds, 6 ounces without the power brick). Performance lags behind many thin-and-light laptops, yet the price is higher than most netbooks (just under $500, as of 11/22/2010). The Asus 1215N really defies easy categorization. Users looking for long battery life, a decent display, and a great keyboard will be happy. Those looking for better performance–and willing to spend more–might take a look at ultraportables instead.

for more asus eee pc 1215n laptop part replacement

Disconnect and remove any and all external devices.

Turn it upside down immediately to stop the liquid from traveling deeper into the machine.

Clean up any part of the spill you can get to. Use paper towels or any absorbent material that is lint-free.

Inspect the keyboard. Some keyboards are designed to protect the internals from liquids:
Pour out any liquid contained in a keyboard enclosure.
Remove and clean an easily removable keyboard.

Wipe up anything sticky. This may include the screen, the keys on the keyboard, and any buttons. Use a clean, slightly dampened, lint-free cloth.

Insulate yourself from static discharge. Static electricity can be very high voltage. Static discharge from your hands and body can destroy even a dry computer. Learn how to Avoid Destroying a Computer With Electrostatic Discharge.

Disassemble the case. If you cannot get to the whole spill, then it may be necessary to remove the laptop’s case. Some spills can contain chemicals that can corrode internal circuit boards:
If you aren’t comfortable taking your device apart, then get it to someone who is, as soon as possible.
Pull the hard drive to protect your data.
Remove as many cards or drives as you can.

Remove dry residue. Use a toothbrush or lint-free cloth to gently remove any dried residue from non-water stains such as cola or coffee. Blow the residue away with compressed air, or use a vacuum cleaner with an adjustable power setting or bypass valve to ensure a gentle attempt is made at removing the residue when it has dried to a powder.

Rinse off the residue. If you spilled anything besides water on the laptop, rinsing it clean will be the most dramatic part. There are several ways to rinse your machine, depending on the kind of spill, and how much risk you are willing to endure:

Think about what has been spilled on/in your computer, and determine whether it is water soluble or petro-chemical based. In the case of the former, deionized water will work fine. If it is oily, etc., then rinse with denatured alcohol, and then rinse with deionized water.
Rinse with water. Take any components that have residue (a fresh spill or an old spill of cola) and rinse them under the tap. Most circuit boards and similar non-moving components handle water well, asus a53u keyboard as long as they are not powered. Some internal components with moving parts may not handle water well, for example, fans and CD/DVD drives.
Rinse with deionized or distilled water. Many people prefer to rinse with deionized water over tap water. Regular water will leave deposits that can cause electrical shorts, but deionized water will rinse clean, dry, and leave nothing behind.
Don’t get too carried away rinsing your machine. Water and laptops do not mix, either. Rinse as much as you need to, and not more. Carefully blot up excess water, if any.

Let it dry. Be completely sure that the parts are dry before you proceed. As with rinsing, there are different theories on drying:

Dry naturally. Prop the machine up, away from surfaces, so that air can circulate in and around the entire unit. Leave the machine to dry for 24 to 48 hours. While it is drying, place the laptop battery in a bowl of uncooked rice.
Dry with light heat. Place your deck on a warm radiator or on top of a warm sill or shelf – out of direct sunlight – or near other source of warmth. Do not use high levels of heat, just moderately warm sources of heat. Let it dry for 12 hours, or so. A nearby dehumidifier may improve drying time. High heat will drive moisture and humidity further into the device and will ensure ongoing problems as that moisture causes oxidation and corrosion.
Never use a hair dryer, as this will cause static problems and fill your machine with more contaminants and dust. A hair dryer at a high setting could also melt some of the plastic components. In extreme cases the hair dryer will drive moisture deeper into the circuits and components and that moisture will oxidize and create capacitive load connections under and inside of integrated circuits and connectors, eventually causing failure of the device. The best way to remove all residual moisture is to patiently draw it away with a vacuum cleaner held over the affected areas for up to 20 minutes in each accessible area, having already removed the majority of liquids and moisture manually and dried all visible moisture by hand, asus k53u keyboard so that none enters the vacuum cleaner. This method is preferable to leaving it to dry naturally as it halts any oxidation from occurring deep inside small surface mount components and connections, that can result in issues later on.

Clean with a solvent. A second rinse with a solvent-based cleaner is recommended by some, and abhorred by others. It is recommended if the unit has been sitting long enough to be subject to corrosion and oxidation before repair and cleaning is attempted. Always use gloves and ensure good room ventilation when handling any solvent or alcohol based cleaners as some are known carcinogens.

If you suspect that your first rinse did not remove all of the residue, a chemical rinse of this kind may be worth the risk. The advantages of such a rinse are: there is only one substance to apply and remove; that substance, typically, evaporates; long drying times are not required. The disadvantage is that, if you use the wrong solvents, you can literally dissolve your computer.
Buy and use 99% (not 90%) isopropyl alcohol. Never, ever use gasoline or acetone to clean computer parts.
Using a cotton swab and/or soft toothbrush, carefully rub or wipe each component of the board, until it is clean.
Try flux remover, a spray-on can available in electronics stores, rather than isopropyl alcohol.
The damage does not happen when the laptop gets wet, the damage occurs when the current from the battery short circuits due to the water which can really put you out a couple hundred dollars. Make sure the laptop is absolutely dry before turning it back on.

Put the laptop back together, and test it to see if it is working.

If the laptop doesn’t turn on, take it to a customer service center.

A VGA port is roughly rectangular with 15 pins in 3 rows of 5. It’s how you connect your laptop to a docking station.
An S-video port is circular with either 4 or 7 pins.
A composite video port is a circular jack, usually color-coded yellow.
A digital video interface (DVI) port is rectangular, with 24 pins in 3 rows of 8. It is designed for high-definition connections. hp g42 fan
A high-definition multimedia interface (HDMI) port resembles a USB port, but is longer and thinner. Available in laptops since 2008, it is also designed for high-definition connections.

See which video input port(s) your TV has. This will depend on whether your TV is a standard-definition or high-definition TV.

Standard-definition TVs usually have composite video or S-video ports. The display will not be as sharp as through your PC’s regular monitor, however. hp g7 fan
High-definition TVs may have VGA, DVI or HDMI ports. VGA connections provide an analog signal, while DVI and HDMI connections provide a digital signal of higher quality.

Get the right video cable to connect your laptop to your TV.

If your laptop’s output port is the same kind as your TV’s input port, get a cable with the same kind of connector on each end.
If your laptop’s output port and your TV’s input port are different, you’ll need an adapter cable. Adapters are available to convert DVI to HDMI or VGA to composite video. You can also get an adapter cable to connect your computer’s USB port to your TV’s HDMI port if your laptop has no HDMI port.

Obtain an audio cable if necessary. Some computers and high-definition TVs can connect to the TV’s audio and video with a single cable, while most require separate audio and video cables.

If your laptop is equipped with an HDMI port and an HDMI-enabled sound card, you don’t need a separate audio cable; otherwise, you do.
Your laptop’s audio output is a 3.5-mm jack marked with a headset icon. You can connect an audio cable from here to your TV’s audio input if it has one or to external speakers if it doesn’t.

Connecting Your Laptop to Your TV
Shut down your laptop.
Connect the video cable to your laptop and TV’s video ports.
Set your TV to the input coming from your laptop. Consult your TV’s user guide for instructions if necessary.
Turn your laptop on. You should see your startup screen.
Adjust the screen resolution if necessary. If you have connected to a high-definition TV, its 16:9 aspect ratio may cause the picture to be stretched. Use a screen resolution that matches this aspect ratio.
If you don’t see a recognizable image, you may have to disconnect your laptop temporarily and adjust your resolution before reconnecting your laptop to your TV.