The EEPROM chip, used in the Dell Latitude 610 laptop, stores much of the CMOS information used for the computer. Two methods can be used to clear the EEPROM chip. One procedure, used by technicians and those with advanced technical knowledge, requires the computer to be completely disassembled; the other procedure does not. Nontechnical users are encouraged to use the second procedure.
- Skill level:
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Things you need
- Philips screwdriver
- Flathead screwdriver
- Plastic scribe tool
- Magnifying glass
Locate the Atmel chip located on the motherboard. The chip, near the network chip, is identified with the manufacturer number "KS24C02" or "24CO." The inscription is small, so you may need a magnifying glass to locate it.
Solder two wires to the 3 and 6 pins or legs on the chip. Make sure the wires extend 5 or more inches beyond the length of the motherboard. This will ensure ample room for you to grasp and tap the wires together (closing the circuit) while powering up the computer as later described. The chip has 4 pins or legs on each side. Count from the top of the chip to locate the 3 and 6 pins. Alternatively, use a paper clip to short the chip. This procedure may require another person assisting you by pressing the power button on the top of the keyboard while you tap the paper clip ends on the 3 and 6 pins.
Re-install the coin-cell battery. The coin-cell battery should be placed back in its plastic casing found on the bottom of the motherboard next to the modem card. Reconnect the video card to the display assembly by inserting the display connector cable into the receptor located on the top-centre of the motherboard. Periodically touch an unpainted metal portion of the computer to dissipate possible electrostatic discharge.
Reconnect the battery pack to the motherboard. The motherboard is designed with a battery pack assembly slot located along the bottom-front of the board. Insert the battery pack into its assembly slot. Turn the motherboard over and inspect it to ensure that the connectors on the back of the battery pack assembly are securely attached to the motherboard and power supply receptors.
Reconnect the keypad to the motherboard, inserting the connector cable found on the bottom-centre of the keypad to the receptor in the centre of the motherboard. Reconnect the display assembly, inserting its connector cable to the video card receptor located on the top-centre of the motherboard. Reattaching the frame assembly for the laptop is not necessary.
Press the power button, starting the laptop. While the laptop is powering up, tap the two wires together repeatedly, closing the circuit. Alternatively, have someone press the power button while you use the ends of a paper clip to tap the 3 to 6 pins, closing the circuit.
Hold down the "Function" key and the "X" key when prompted to do so on-screen. The on-screen prompt to perform this procedure is an indication that the EEPROM chip has been cleared and is now operating at factory default settings.
Clearing EEPROM on a Dismantled Laptop
Remove the screw on the modem cover. The modem cover is located on the bottom of the computer just below the audio jacks. There is an indentation in the cover designed to assist in removing it.
Remove the coin-cell battery from its plastic casing. Detach the battery from its cable connection, gently using your fingers or a pair of tweezers. Lift the plastic casing that holds the coin-cell battery, exposing the bottom of the EEPROM chip. Visible are four silver pins, three of which are on the left side of the chip. It is this chip that contains the laptop's CMOS information. (Verify this is the correct chip by looking for the manufacturer's inscription described in Section One.)
Place the laptop on its side with the cover slightly open, allowing you easy access to the bottom of the EEPROM chip and the power button located on the top section of the keyboard. Look to see that both the battery pack and AC adaptor are connected to the laptop. Make sure that the AC adaptor is connected to a working wall outlet, power strip or surge protector.
Place a flathead screwdriver on the three silver pins on the left side of the EEPROM chip while holding down the power button on the laptop, powering up the laptop. This clears the EEPROM chip.
Shut down the laptop and replace the coin-cell battery casing, battery and modem cover. Restart the computer.
Clearing EEPROM of an Operating Laptop
Tips and warnings
- Only trained technicians or advanced users who have the appropriate soldering tools, workbench and service manual should follow the process in Section One. Knowledge of computer repair and assembly is required.
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