dell latitude c840 User Manual

							Display: Dell Latitude C840 Service Manual
 
1M2.5 x 6-mm screws (2)
1.  Remove the 
hinge cover. 
NOTICE: Remove the display flex cable before you remove the display 
assembly. 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (4 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
 
1 M2.5 x 6-mm screw
2 strain relief
3 display flex cable
4 pull loop
2.  Remove the M2.5 x 6-mm flex-cable strain relief screw, and then use the \
pull  loop to remove the display flex cable from the graphics card. 
NOTICE: When reconnecting the flex cable, press down on both ends of the 
connector, not in the middle. Pressing the middle of the connector can d\
amage 
fragile components. 
3.  Open the display and, from the back of the computer, remove the two M2.5\
 x 6- mm screws labeled circle D that secure the display assembly to the bot\
tom 
case. 
4.  With the display in an upright position, lift the display assembly from \
the bottom  case. 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (5 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (6 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
1M2.5 x 4-mm screws (6) 8M2 x 3-mm screws 
(6)
2 rubber screw covers (4) 9top cover
3 display bezel 10hinge cover
4 plastic tabs (6) 11display flex cable
5 M2.5 x 4-mm screw 12display panel
6 flex-cable mounting 
bracket 13
plastic screw covers 
(2)
7 display latch   
Display Bezel
1.  Use a scribe to pry out the four rubber screw covers located across the \
top of 
the bezel. 
2.  Remove the four M2.5 x 4-mm screws located across the top of the bezel. \
3.  Use a scribe at the indentations to pry out the two plastic screw covers\
 located  at the bottom of the bezel. 
4.  Remove the two M2.5 x 4-mm screws located at the bottom of the bezel. 
5.  Separate the bezel from the top cover. 
The bezel is secured to the top cover with plastic tabs around the sides\
. Use a 
plastic scribe to help separate the bezel from the top cover.
Display Panel
Removing the Display Panel 
1.  Remove the hinge cover. 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (7 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
2.  Detach the display flex cable from the strain relief and the graphics card. 
3.  Remove the 
display bezel. 
4.  Remove the M2.5 x 4-mm screw that secures the plastic flex-cable mountin\
g  bracket to the top cover. 
5.  Remove the six M2 x 3-mm screws (three on each side) from the right an\
d left  sides of the panel. 
6.  Lift the display panel and flex cable out of the top cover. 
7.  Disconnect the flex cable from the two connectors (one ZIF and one stan\
dard  connector) on the display panel. 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (8 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
 
1 ZIF connector
2 standard connector
Replacing the Display Panel 
NOTE: Use a magnetic screwdriver to reassemble the display panel in the 
display. 
1.  Connect the flex cable to the two connectors on the back of the display \
panel. 
2.  Place the display panel in the top cover, taking care that the flex cabl\
e is in  place and is not crushed or crimped. 
3.  Reinstall the M2.5 x 4-mm screw that secures the flex-cable mounting bra\
cket  to the top cover. 
4.  Starting on the left side, use a magnetic screwdriver to reinstall the s\
ix M2 x 3- mm screws that secure the display panel in the top cover. 
5.  Reinstall the M2.5 x 6-mm flex-cable strain relief screw, and reconnect \
the flex  cable to the graphics card. 
6.  Reinstall the display bezel. 
Display Latch
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (9 of 10) \
[2/28/2004 8:03:40 AM] 
						

							Display: Dell Latitude C840 Service Manual
 
1.  Remove the 
hinge cover. 
2.  Detach the 
display flex cable from the strain relief and the graphics card. 
3.  Remove the 
display bezel. 
4.  Remove the 
display panel from the top cover. 
5.  Remove the display latch by disengaging the latch and captive spring. 
Back to Contents Page
 
 
 
file:///F|/Service%20Manuals/Dell/Latitude/c840/display.htm (10 of 10)\
 [2/28/2004 8:03:40 AM] 
						

							Microprocessor Thermal-Cooling Assembly: Dell Latitude C840 Service Manu\
al
Back to Contents Page 
Microprocessor Thermal-Cooling 
Assembly 
Dell™ Latitude™ C840 Service Manual
NOTICE: Disconnect the computer and attached devices from electrical outlets 
and remove any installed batteries. 
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by 
periodically touching unpainted metal on the computer. 
 
1 microprocessor thermal-
cooling assembly
file:///F|/Service%20Manuals/Dell/Latitude/c840/thermal.htm (1 of 3) [\
2/28/2004 8:03:41 AM] 
						

							Microprocessor Thermal-Cooling Assembly: Dell Latitude C840 Service Manu\
al
2microprocessor retaining 
clip
Removing the Microprocessor Thermal-Cooling 
Assembly 
1.  Follow the instructions in Preparing to Work Inside the Computer. 
2.  Remove the 
keyboard. 
3.  Remove the 
hinge cover. 
4.  Insert a non-marring plastic scribe into the latch mechanism at the left\
 side of  the microprocessor retaining clip. Pry open the clip by pivoting the top\
 of the 
screwdriver toward the right side of the computer. 
 
1 microprocessor thermal-
cooling assembly
file:///F|/Service%20Manuals/Dell/Latitude/c840/thermal.htm (2 of 3) [\
2/28/2004 8:03:41 AM] 
						

							Microprocessor Thermal-Cooling Assembly: Dell Latitude C840 Service Manu\
al
NOTICE: To ensure maximum cooling for the microprocessor, do not touch the 
heat transfer areas on the microprocessor thermal-cooling assembly. The \
oils in 
your skin reduce the heat transfer capability of the thermal pads. 
5.  Lift out the thermal-cooling assembly. 
Back to Contents Page
 
 
 
file:///F|/Service%20Manuals/Dell/Latitude/c840/thermal.htm (3 of 3) [\
2/28/2004 8:03:41 AM]