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Dell D420 - Latitude Notebook Computer, Service Manual

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Dell D420 - Latitude Notebook Computer Service Manual Download Page 16

6.

Pull on the display cable pull-tab toward the back of the computer to disconnect the display cable from the display connector on the system board.  
 

 

  

7.

Lift the display assembly away from the computer.  
 

  

 

Removing the Display Bezel  

 

 

1.

Remove the six screw covers/bumpers and the six M2.5 x 4.2-mm shoulder screws from the display bezel.  
 

 

  

2.

Use your fingers to carefully separate the display bezel from the top cover.  
 

  

 

Removing the Display Panel  

 

 

1.

Remove the two M2 x 3-mm screws from the display panel.  
 

 

  

2.

Lift the display panel off the top cover.  
 

1 

Mini-Card antenna cables 

2 

display cable 

3 

display assembly 

 

NOTE: 

When you replace the display assembly, route the Mini-Card antenna cables through the system board and turn the computer upside down to 

connect the antenna cables to the Mini-Cards.

1  screw covers/bumpers (6) 

2  M2.5 x 4.2-mm shoulder screws (6) 

3  display bezel 

4  top cover 

 

 

 

 

 

 

 

 

Summary of Contents for D420 - Latitude Notebook Computer

Page 1: ...r products Dell Inc disclaims any proprietary interest in trademarks and trade names other than its own June 2006 Rev A00 Before You Begin Suspend Switch Sensor Board Hard Drive System Board Hinge Cover Fan Keyboard PC Card Smart Card Reader Coin Cell Battery Modem Internal Card With Bluetooth Wireless Technology Wireless Switch Memory and Mini Cards Power Button Assembly Display Assembly Battery ...

Page 2: ...pside down and remove the protruding battery latch c Turn the computer base topside up and pry out and lift away the battery latch assembly 12 To remove the shorter battery latch assembly a Use a screw driver or a plastic scribe to press down on the securing tab b Turn the computer base upside down and remove the protruding battery latch c Turn the computer base topside up d Pull the battery latch...

Page 3: ...Back to Contents Page 1 screw driver 2 bracket 3 securing tab 4 shorter battery latch assembly 5 computer base ...

Page 4: ...sonal safety 1 Ensure that the work surface is flat and clean to prevent the computer cover from being scratched 2 Turn off your computer see Turning Off Your Computer 3 If the computer is connected to a docking device docked undock it See the documentation that came with your docking device for instructions NOTICE To avoid losing data save and close all open files and exit all open programs befor...

Page 5: ... from their electrical outlets 7 Remove the main battery a Slide the two battery bay latch releases on the bottom of the computer b Remove the battery from the battery bay 8 Press the power button to ground the system board Back to Contents Page NOTICE To avoid damaging the system board you must remove the main battery before you service the computer 1 battery 2 battery bay latch releases 2 ...

Page 6: ...t the card cable connector from the card Back to Contents Page CAUTION Before performing the following procedures read the safety instructions in your Product Information Guide NOTICE To avoid electrostatic discharge ground yourself by using a wrist grounding strap or by periodically touching a connector on the back panel of the computer NOTICE To prevent damage to the system board remove the main...

Page 7: ...e system board see System Board 11 Turn the system board upside down and pull on the pull tab to disconnect the PC Card smart card reader connector from the bottom of the system board 12 Turn the system board topside up remove the reader from the system board Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Informati...

Page 8: ... angle under the clip with the positive identified by a plus symbol side up and then push it into place Back to Contents Page CAUTION Before performing the following procedures follow the safety instructions in your Product Information Guide NOTICE To avoid electrostatic discharge ground yourself by using a wrist grounding strap or by periodically touching a connector on the back panel of the comp...

Page 9: ...und yourself by touching one of the metal connectors on the back of the computer 4 If you are replacing a memory module remove the existing module a Use your fingertips to carefully spread apart the securing clips on each end of the memory module connector until the module pops up b Remove the module from the connector NOTE Memory modules purchased from Dell are covered under your computer warrant...

Page 10: ...click Start Help and Support Dell System Information Mini Cards 1 Follow the procedures in Before You Begin 2 Turn the computer upside down and loosen the three captive screws on the memory Mini Card module cover and remove the cover Wireless Local Area Network WLAN Cards 1 If a WLAN card is not already installed go to step 2 If you are replacing a WLAN card remove the existing card 1 memory modul...

Page 11: ...with the black triangle 3 Connect the antenna cables to the WLAN card ensuring that you route the cables correctly 4 Replace the memory Mini Card module cover 1 antenna cables 2 NOTICE To prevent damage to the connector do not use tools to spread the securing clips 1 WLAN card 2 metal securing clips 2 NOTICE The connectors are keyed to ensure correct insertion If you feel resistance check the conn...

Page 12: ...e any antenna cables out of the way to make space for the card NOTE Mobile Broadband cards may not be available in all regions CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide 1 antenna wires 2 2 Mobile Broadband card 1 Mobile Broadband card 2 metal securing tabs 2 NOTICE To prevent damage to the connector do not use too...

Page 13: ... card never place cables on top of or under the card and ensure that you route the cables properly NOTE Cable routing for the Mobile Broadband card may vary 1 Mobile Broadband card 2 system board connector NOTE For more specific information about which cable to connect to which connector see the documentation that came with your Mobile Broadband card NOTICE To protect the SIM card from electrostat...

Page 14: ...on SIM card slot 2 SIM card with cut off corner NOTE When you replace the SIM card ensure that you slide the SIM card under the two metal tabs on the SIM card slot with the cut off corner of the card facing toward the back of the computer ...

Page 15: ...move the antenna cables from the WLAN and Mobile Broadband Mini Cards if applicable 4 Turn the computer over topside up and open the display approximately 180 degrees so that it lies flat against your work surface 5 Carefully dislodge the Mini Card antenna cables from their routing guides and pull the cables with their connectors through the system board so that they are clear of the computer base...

Page 16: ...e your fingers to carefully separate the display bezel from the top cover Removing the Display Panel 1 Remove the two M2 x 3 mm screws from the display panel 2 Lift the display panel off the top cover 1 Mini Card antenna cables 2 display cable 3 display assembly NOTE When you replace the display assembly route the Mini Card antenna cables through the system board and turn the computer upside down ...

Page 17: ... the display panel brackets Removing the Display Cable 1 M2 x 3 mm screws 2 2 display panel 3 top cover 1 display panel brackets 2 2 M2 x 3 mm screws 4 3 display panel 1 back of display panel cable assembly 2 pull tab on inverter connector 3 bottom flex cable connector 4 top flex cable connector ...

Page 18: ...Removing the Display Latch Back to Contents Page 1 M2 x 3 mm screws 2 2 screw holders 2 3 display latch 4 metal plate 5 display base ...

Page 19: ...ector from the top of the system board 11 Turn the system board upside down 12 Loosen the three captive screws from the fan and lift the fan away from bottom of the system board Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide CAUTION To prevent static damage to components inside your computer disch...

Page 20: ...dates the new BIOS When the flash update is complete the computer will automatically reboot 3 Press F2 during POST to enter the system setup program 4 Press Alt F to reset the computer defaults 5 Press Esc Suspend select Save changes and reboot and press Enter to save configuration changes 6 Remove the flash BIOS update program CD from the drive and restart the computer Back to Contents Page NOTE ...

Page 21: ...the safety instructions in the Product Information Guide NOTICE To prevent data loss turn off your computer before removing the hard drive Do not remove the hard drive while the computer is turned on in standby mode or in hibernate mode NOTICE Hard drives are extremely fragile even a slight bump can damage the drive NOTE Dell does not guarantee compatibility or provide support for hard drives from...

Page 22: ... hard drive cable and remove the cable 1 pull tab 2 hard drive cable 3 hard drive 4 system board connector NOTICE The replacement hard drive ships with the protective cover and the hard drive cable Only a certified service technician should dismantle the hard drive Damage due to servicing that is not authorized by Dell is not covered by your warranty 1 protective cover 2 hard drive ...

Page 23: ...nstall the drivers and utilities for your computer see Reinstalling Drivers and Utilities in your computer User s Guide Back to Contents Page 1 ZIF connector 2 hard drive cable NOTICE Use firm and even pressure to slide the drive into place If you use excessive force you may damage the connector NOTE This computer is not equipped with an optical drive use the Media Base sold separately to install ...

Page 24: ...d press from left to right until the cover snaps into place Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide NOTICE To avoid electrostatic discharge ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface such as a connector on the back of the computer...

Page 25: ...the top of the keyboard 4 Replace the hinge cover Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide NOTICE To avoid electrostatic discharge ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface such as a connector on the back of the computer NOTICE Th...

Page 26: ...system board and carefully dislodge the modem cable from the metal clips on the system board 12 Remove the M2 x 3 mm modem screw and pull up on the modem pull tab to remove the modem from its socket on the system board To replace the modem ensure that the modem is properly aligned with the socket and that you route the modem cable correctly under the metal clips on the system board Back to Content...

Page 27: ...uetooth wireless technology see Internal Card With Bluetooth Wireless Technology 8 Remove the display assembly see Display Assembly 9 Turn the computer upside down and remove the seven M2 5 x 5 mm screws from the computer base 10 Turn the computer topside up and remove the six M2 5 x 5 mm screws labeled P from the top of the palm rest CAUTION Before you begin any of the procedures in this section ...

Page 28: ... Starting at the back center of the palm rest use your fingers to separate the palm rest from the computer base by lifting the inside of the palm rest while pushing in on the outside 1 M2 5 x 5 mm screws 6 NOTICE Pull on the plastic tab on top of the connectors to avoid damaging the connectors 1 speaker connector 2 Secure Digital SIM card reader cable connector 3 touch pad connector 4 LED board co...

Page 29: ...Connect the speaker connector to the system board 6 Replace the six M2 5 x 5 mm screws labeled P on the top of the palm rest 7 Turn the computer upside down and replace the seven M2 5 x 5 mm screws in the computer base 8 Replace the display assembly see Display Assembly 9 Replace the internal card with Bluetooth wireless technology see Internal Card With Bluetooth Wireless Technology 10 Replace th...

Page 30: ...vice Manual USB Connector Video Connector USB Connector Video Connector Back to Contents Page Pin Signal 1 USB5V 2 USBP 3 USBP 4 GND Pin Signal Pin Signal 1 CRT_R 9 5V 2 CRT_G 10 GND 3 CRT_B 11 MONITOR_DETECT 4 NC 12 DDC_DATA 5 GND 13 CRT_HS 6 GND 14 CRT_VS 7 GND 15 DDC_CLK 8 GND ...

Page 31: ...ssembly see Display Assembly 9 Remove the palm rest see Palm Rest 10 Disconnect the power button assembly connector from the system board 11 Push the assembly toward the inside of the computer base and lift out Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide CAUTION To prevent static damage to comp...

Page 32: ...ct the suspend switch sensor board connector from the system board 11 Remove the M2 x 3 mm screw and lift the suspend switch sensor board away Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide CAUTION To prevent static damage to components inside your computer discharge static electricity from your b...

Page 33: ...ssembly 9 Remove the palm rest see Palm Rest and lay it aside 10 Remove the system board see System Board 11 Use a screw driver or plastic scribe to carefully pry the wireless switch from the wall of the computer base Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Guide CAUTION To prevent static damage ...

Page 34: ...nology 8 Remove the display assembly see Display Assembly 9 Remove the palm rest see Palm Rest 10 Turn the palm rest upside down and disconnect the speaker connector from the system board 11 Remove the two M2 x 3 mm speaker screws from the computer base Back to Contents Page CAUTION Before you begin any of the procedures in this section follow the safety instructions in the Product Information Gui...

Page 35: ...t see Palm Rest 10 Disconnect the power button connector from the system board 11 Disconnect the suspend switch sensor board connector from the system board 12 Remove the remaining two M2 5 x 5 mm screws that secure the system board to the computer base 13 Lift the system board at an angle toward the side of the computer and out of the computer base CAUTION Before you begin any of the procedures i...

Page 36: ... on the screen Back to Contents Page 1 computer base 2 M2 5 x 5 mm screws 2 3 system board assembly 4 power button connector 5 suspend switch sensor board NOTICE Before turning on the computer replace all screws and ensure that no stray screws remain inside the computer Failure to do so may result in damage to the computer NOTE After you have replaced the system board enter the computer Service Ta...

Page 37: ...ed by Bluetooth SIG Inc and is used by Dell Inc under license Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products Dell Inc disclaims any proprietary interest in trademarks and trade names other than its own June 2006 Rev A00 Back to Contents Page NOTE A NOTE indicates important information that helps you make ...

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