HP Omnibook 4100 4150 Service Manual

							HP OmniBook 4100/4150 Removal and Replacement 2-9
Removing the Keyboard
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
 · Probe or tweezers.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. On the bottom of the unit, remove the seven “K” screws from the bottom case.
 3. Insert your small finger into the PCMCIA opening and push up the top of the keyboard—or you
can lift it from above using a thin flat-blade screwdriver. After lifting the back edge slightly, slide
the keyboard toward the back until the front-left corner is free.
 4. With the display tilted only slightly back, lift the front of the keyboard and lean it back against the
display. Be careful not to scratch the display or pull on the cables.
 5. Release the pointing stick flex cable from the VGA PCA.
 6. Release the keyboard flex cable from the VGA PCA.
 
 Figure 2-5. Removing the Keyboard
Keyboard and
pointing stick
flex cables
Strip cover
Pointing stick cap
Screw, M2.5×16mm (7) 
						

							2-10 Removal and Replacement HP OmniBook 4100/4150
  Note
 
For an OmniBook 4100 with a serial number between TW 82000000 and TW 83599999, if the date
code on the bottom of the keyboard is “828”, replace the keyboard. (Service note 4100-02.)
 
F1460 and F1462 keyboards are not compatible with 4150B models. F1649 keyboards are
compatible with all models. See the table on page 5-6 for part numbers.
Reassembly Notes
 · To connect the larger keyboard flex cable, lay the keyboard flat on the top case slightly forward of
its normal position. To connect the smaller pointing stick flex cable, tip up the keyboard against
the display.
  Caution
 
After connecting the keyboard and pointing stick flex cables, lean the keyboard forward and tuck
the excess length of the keyboard flex cable under the strip cover behind the keyboard. If a
stiffener tab is present on the larger cable, make sure its free end lays toward the front of the
case—so the tab is not under the strip cover. Check the cable again after lowering the keyboard
into its final position.
 
Hint
 
On the bottom case, the holes for the keyboard screws are marked by “K”. The hole recesses
have flat bottoms for the 16-mm T-head screws (not tapered as for longer flathead screws). 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-11
Removing the Display Assembly
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. On the back of the unit, lift up on the VGA connector cover above the VGA port and unsnap it
from the case.
 3. Remove the screw above the VGA port.
 4. Remove the four “D” screws from the bottom case.
 5. Open the display about 90 degrees, then lift off and lay back the combined top-case strip cover
and display assembly. Do not lose the two springs from the bottom case.
 6. Remove the two screws from the LCD flex cable end and unplug the cable.
 
 Figure 2-6. Removing the Display
LCD flex cable
Strip cover
Screw, M2×4mm
VGA connector
cover
Screw, M2.5×5mm
Caution:
Install new screws after
removing the two 16mm
screws at the corners.
Screw, M2.5×16mm (2)
Screw, M2.5×19mm
(2) Screw, M2.5×5mm
(1)
Note:
Loose spring located
in each hole (2). 
						

							2-12 Removal and Replacement HP OmniBook 4100/4150
Reassembly Notes
 · Before installing the display assembly, make sure a grounding spring is present in each hole at the
back corners of the left and right frames.
  Caution
 
Install new screws for all screws you remove that hold the display hinges. Otherwise, the hinges
could loosen over time.
 
Hint
 ·  W hile attaching the LCD flex cable to the base, rest one corner of the display on the bottom
case.
 · On the bottom case, the holes for the display screws are marked by “D”. The hole recesses
have flat bottoms for the 16-mm T-head screws and tapered bottoms for the longer 19-mm
flathead screws. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-13
Removing the LCD Module
(HP Authorized Service Providers Only)
  Note
 
The exact details for removing the LCD module depend on the type of module. Some details may
differ from those described in this section.
 
See the table below for information about matching components for different types of LCD
modules.
 Table 2-7. Display Component Compatibility
LCD Type*13Samsung14 LG14 IBM74*14 IBM74E*
OmniBook Model410041004150†41004150†4150†
Bezel, displayF1460-60969 F1460-60967 F1629-60909 F1462-60927 F1629-60919 or F1660-60911
Cable, LCD flexF1460-60975 F1460-60981 F1629-60915
Cable, LED stripF1460-60972 F1629-60916
Case, displayF1460-60970 F1460-60968
Kit, display case (latch...)F1460-60971
Kit, LCD (brackets, shield...)F1460-60974 F1460-60980 F1629-60932 F1640-60909
LCD moduleF1460-69098 F1440-69095 F1629-69012 F1640-69008
PCA, inverterF1460-60917 F1460-60918 F1629-60908 F1629-60917
PCA, LVDSF1460-60914 F1460-60916 F1629-60907 F1462-60926 F1629-60918
PCA, VGAF1460-60906 F1629-60903 F1460-60906 F1629-60903
LCD Type*13 Hyundai14 LG*14 IBM74E14 IBM76*14 CPT
OmniBook Model4150B4150B4150B4150B4150B
Bezel, displayF1655-60915 F1660-60911
Cable, LCD flexF1660-60922 F1660-60913 F1660-60921 F1660-60913 F1660-60920
Cable, LED stripF1629-60916
Case, displayF1460-60970 F1460-60968
Kit, display case (latch...)F1460-60971
Kit, LCD (brackets, shield...)F1660-60919 F1660-60915 F1640-60909 F1660-60915 F1660-60918
LCD moduleF1655-69020 F1660-69029 F1640-69008 F1660-69028 F1660-69030
PCA, inverterF1460-60917 F1660-60912 F1660-60924 F1660-60912
PCA, LVDS(none) (none) (none) (none) (none)
PCA, VGA
(with switch settings)F1660-609084 —
n
3 
n— 0
2 
n— F
1 
n— FF1660-609084 
n—
3 
n— 0
2 
n— F
1 —
n FF1660-609084 
n—
3 
n— 0
2 —
n F
1 
n— FF1660-609084 
n—
3 
n— 0
2 —
n F
1 —
n FF1660-609084 
n—
3 —
n 0
2 
n— F
1 
n— F
* To identify the type of LCD module, see the marking printed on the LCD flex cable where it plugs into the
base—it may be on the top or bottom of the cable.
For an OmniBook 4150B with an LG or IBM76 LCD module, if the marking on the cable is not certain,
see the switch settings on the VGA PCA to identify the module.
For an OmniBook 4150† with an IBM LCD module, the IBM74 has a shield with a solid back, and the
IBM74E has a shield with a mylar-covered opening across the back.
† Models called 4150† in this manual have no marking in the serial number, whereas models called 4150B
have 4150 B after the serial number. 
						

							2-14 Removal and Replacement HP OmniBook 4100/4150
Required Equipment
 · Small Phillips screwdriver.
 · Pointed knife or probe.
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove the display assembly and strip cover from the unit (page 2-11).
 3. On the display bezel, remove the upper and lower screw covers (using a pointed knife or probe),
then remove the six screws.
 4. At the bottom of the display, lift up the inner edge of the bezel near both hinges until it unsnaps—
be careful to keep the end caps. Then at one side of the display, use your fingers to gently pull the
display bezel outward, toward the edge of the case, until the snaps release. When one side is free,
repeat along the opposite side—until only the top edge is attached.
 5. Now lift the bottom edge about 5 cm and press inward along the top edge until the snaps release
and the bezel lifts off.
 6. Remove the two screws holding the LCD brackets and hinges near the bottom corners of the
display case. Remove the combined hinges and strip cover.
 7. On the plastic cable holder, unsnap the cover.
 8. If present, unplug the flex cable that wraps around the inverter PCA to the left of the cable holder.
 9. Unplug the three cables from the inverter PCA—raise the PCA out of the case, if necessary.
Remove the PCA.
 10. Slide the LCD module and brackets toward the bottom of the case. When the slots in the brackets
clear the tabs in the case, lift out the LCD module—the LED strip cable is still in the display case.
 11. If the LED strip cable is held by the LCD bracket, place the LCD module next to the display case
and LED strip.
 12. Remove the four screws holding the brackets to the LCD module.
 13. Separate the LCD module and the shield:
 · You may have to remove one or more pieces of tape.
 · If the flex cable is still attached to the LCD module, unplug the cable. 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-15
 
 Figure 2-7. Removing the LCD Module
Screw, M2.5×4mm (6)
Screw cover, upper domed (2)
Screw cover, lower flat (4)Display bezel
LCD module
Strip cover, hinges,
and hinge covers
Cable holderLED strip
cable LCD shield
LCD brackets,
left and right Screw (size depends
on LCD module)
LCD flex cable
Screw, M2.5×4mm (2)
Display case
Note:
14-inch LG display shown.
For a different display, the
LCD flex cable and other
details differ.
Cable holder cover
End cap (2)Caution:
Install new screws after
removing any of the four
circled screws.
Caution:
Reinstall protective tape
at the corner, if originally
present.
Note:
LCD type is marked on
the end of the flex cable.Inverter PCA 
						

							2-16 Removal and Replacement HP OmniBook 4100/4150
Reassembly Notes
  Caution
 ·  Be sure to replace the LCD module or other display components with compatible parts.
Components may be damaged if compatible parts are not used. See the table on page 2-13.
 ·  At the lower-right corner of the LCD, reinstall protective tape if it was present on the original
LCD.
 ·  For an OmniBook 4150B, if you install a different type of LCD module, you must set the
switches on the VGA PCA according to the type of LCD module. See the table on page 2-13.
 ·  Install new screws for all screws you remove that hold the display hinges. Otherwise, the
hinges could loosen over time.
 · For an LED strip cable that is routed around the bottom-right corner of the LCD, make sure it is
routed through the corner of the LCD bracket.
 · Install the inverter PCA under the main LCD flex cable.
 · The extra length of LCD wires connecting to the inverter PCA is folded back along the PCA.
 · Snap in the end caps after the display is assembled.
 
Caution
 
At the lower-right corner of the LCD module, be careful the wires are not pinched where they pass
next to the LCD bracket. Otherwise, they could be damaged.
 
Caution
 
For a 13-inch LCD, make sure the spacers and tape are installed when you assemble the LCD
module and LCD shield. Otherwise, LCD quality may be significantly degraded, including noise or
discoloration when the display is moved. (Service notes 4100-04, 4100-05.)
 
 
Back of 13-Inch LCD and Shield
Removing the Top Case
(HP Authorized Service Providers Only)
Required Equipment
 · Small Phillips screwdriver.
Install tape here to
hold the cable to the
shield.Make sure two rubber
spacers are present in
the connector recess. If
necessary, transfer
them from the old LCD
or install new spacers.
Note: If one long spacer
is present, replace it
with two short ones.
ShieldLCD 
						

							HP OmniBook 4100/4150 Removal and Replacement 2-17
Removal Procedure
 1. Unplug the ac adapter, if present, and remove the battery.
 2. Remove these additional assemblies:
 · Floppy module or other module (page 2-3).
 · Hard disk drive (page 2-5).
 · Keyboard (page 2-9).
 · Display assembly and strip cover (page 2-11).
 3. Remove the grounding springs from the back corners of the left and right frames.
 4. On each of the front corners of the case, do the following:
 · Slide the module latch slider forward on the side of the case.
 · Slide the speaker cover forward slightly and swing it outward about 2 cm, then pull firmly
until it unsnaps from the case. The slider may come off of the module latch.
 5. Unplug the touch-pad flex cable from the VGA PCA.
 6. On the bottom of the unit, remove the seven unmarked case screws from the front half of the case.
 7. Turn the unit face up and lift off the top case—to release the tab at the left side near the PS/2 port,
twist up the outer edge of the top case above the PS/2 port.
 
 Figure 2-8. Removing the Top Case
Speaker cover,
left and right
Top case
Module latch slider
Speaker
Screw, M2.5×19mm (5)
Screw, M2.5×16mm (2) 
						

							2-18 Removal and Replacement HP OmniBook 4100/4150
Reassembly Notes
 · Position the speaker on the pins on the bottom case before you install the speaker cover.
 · If the slider came off the module latch, attach it to the latch before you install the speaker cover.
 
Hint
 
On the bottom case, the holes for the top case screws are unmarked. The hole recesses have flat
bottoms for the 16-mm T-head screws and tapered bottoms for the longer 19-mm flathead
screws.