Toshiba Tecra 780dvd Maintenance Manual

							Toshiba TRR4/00, Tecra
Page 17Tecra 780CDM / 780DVD Disassembly Overview, (cont.)
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, optional PC
card, HDD pack, optional memory
module, modem board, backup and
RTC batteries, keyboard, membrane
switch, top cover with display assembly,
and system board.
3.Turn the system board upside down
and remove tape securing the fan
cable.
4.Disconnect the fan cable from PJ550
on the system board.
5.Turn the system board right side up and
remove two M2.5x4 screws.
6.Lift out the fan. To remove the fan, follow the steps below.
To remove the middle frame, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, optional PC
card, HDD PACK, optional memory
module, modem board, backup and
RTC batteries, keyboard, membrane
switch, top cover with display assembly,
and system board.
3.Remove two M2.5x6 screws and one
M2.5x8 screw securing the SelectBay
top cover to the middle frame.
4.Two positioning pins fit into holes on
the SelectBay top cover, so lift the cover
straight up to clear the pins.
5.Remove three M2.5x10 silver screws
securing the CONN holder assembly
and lift out the CONN holder assembly.
6.Disconnect two secondary battery
cables (PJ511 and PJ512) from the I/O
board and remove the cables with the
protective metal plate.
7.Remove two M2.5x8 screws securing
the middle frame to the bottom cover.
8.Pull out the SelectBay release lever
and set the SelectBay lock to the lock
position.
CAUTION:  Make sure the SelectBay lock is
locked before removing the middle frame
from the bottom cover.  If you remove the
middle frame while the SelectBay lock is
unlocked, the I/O board will be damaged.
NOTE:  Make sure the screw in the memory
slot has been removed.
9.Remove the middle frame from the base
of the computer.ê 
						

							4/00, Tecra Toshiba TRRPage 18Tecra 780CDM / 780DVD Disassembly Overview, (cont.)
To install the middle frame, follow the steps
below.
1.Make sure the SelectBay release lever
is extended and the SelectBay lock is in
the locked position.
2.Seat the middle frame and make sure a
small tongue on the middle frame’s
SelectBay locking mechanism fits into a
corresponding notch on the external
SelectBay lock.
3.First secure one M2.5x8 screw next to
the SelectBay lock arm, then secure the
other M2.5x8 screw.
4.Place the CONN holder assembly and
secure it with three M2.5x10 silver
screws.
5.Connect two secondary battery cables
to the I/O board.
6.Seat the protective metal plate.
7.Thread the battery cables in the groove
and seat the cable holder.
8.Replace the tape.
9.Secure the SelectBay top cover with
two M2.5x6 screws and one M2.5x8
screw.
10.Install the system board, top cover with
display assembly, membrane switch,
keyboard, backup and RTC batteries,
modem board, optional memory
module, HDD pack, optional PC card,
and battery pack.
To remove the I/O board, follow the steps.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, optional PC
card, HDD pack, optional memory
module, modem board, backup and
RTC batteries, keyboard, membrane
switch, top cover with display assembly,
system board, and middle frame.
3.From the bottom of the battery pack slot,
push up on the battery jumper contact
and slide it forward.
4.Press down on the battery jumper as
shown in the figure below and slide the
jumper out to remove it.
5.Remove one M2x6 screw securing the
I/O board to the bottom cover.
6.Lift out the I/O board.
7.Lift out the base shield assembly (with
rubber heat conductor).î 
						

							Toshiba TRR4/00, Tecra
Page 19Tecra 780CDM / 780DVD Disassembly Overview, (cont.)
To remove the display mask, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack.
3.Remove two rubber seals at the
bottom corners of the display assembly.
4.Remove two M2.5x6 screws that were
covered by the rubber seals.
NOTE: Support the display with your hand
when you remove the screws.
5.Using the fingers of both hands,
carefully release the 18 latches along
the edges of the display mask.  Begin
at the top (six latches), continue along
the sides (four latches on each side)
and the bottom (four latches).í
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack and the
display mask.
3.Lay the display panel on its back.
4.Remove two M2.5x6 screws securing
the FL inverter board.
5.Lift up the FL inverter board and
disconnect the FL cable.
6.Rotate out the top end of the FL
inverter board.  Disconnect the FL
inverter cable and lift out the FL
inverter board. To remove the FL inverter board, follow the steps
below.î 
						

							4/00, Tecra Toshiba TRRPage 20Tecra 780CDM / 780DVD Disassembly Overview, (cont.)
NOTE:  Be careful not to apply pressure to
the ICs along the edge of the LCD module.
The ICs are easily damaged.
To remove the LCD module, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, display mask
and FL inverter board as described in
Sections 4.2, 4.19 and 4.20.
3.Remove four M2.5x8 screws securing
the LCD module to the display assem-
bly.
4.Carefully rotate out the top of the LCD
module enough to access the display
cable.
5.Peel off the tape securing the cable and
disconnect the cable.
To remove the microphone, follow the steps
below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, optional PC
card, HDD pack, optional memory
module, modem board, backup and
RTC batteries, keyboard, membrane
switch, top cover with display assembly,
and speakers.
3.Lay the top cover with display assembly
down so that the bottom of the top cover
lies flat and faces up.
4.Remove one M2x4 screw securing the
hinge cover and one M2.5x6 screw
securing a plastic cable guide.
5.Remove one M2.5x4 screw holding the
microphone ground cable.
6.Release the cable guide from the top
cover at the top right corner of the left
speaker cable groove.
7.Lift the small end of the cable guide
about 2.5 cm, then use tweezers to
push down the LCD cable core to free
the cable guide.
8.Lift the cable guide straight up and pull
the microphone cable out of the cable
guide.
9.Rotate the top cover up about 90
degrees.
NOTE:  Grasp the top cover by the sides
when you rotate it up.  Do not pull at the
center.
10.Lift out the microphone holder and
cable and remove the microphone from
the holder.ê 
						

							Toshiba TRR4/00, Tecra
Page 21Tecra 780CDM / 780DVD Disassembly Overview, (cont.)
CAUTION:  When you remove the FL, be
careful not to let any dust or other foreign
matter contaminate the LCD panel.  Any
contamination can affect the performance of
the unit.
To remove the FL, follow the steps below.
1.Turn off the power to the computer.
Disconnect the AC adapter and all
external cables connected to the
computer.
2.Remove the battery pack, optional PC
card, HDD pack, optional memory
module, modem board, backup and
RTC batteries, keyboard, membrane
switch, top cover with display assem-
bly, speakers, display mask, FL inverter
board, LCD module, and microphone.
3.Remove one strip of tape securing the
FL cable to the LCD frame and lift up
the FL cable.
4.Remove two M2x4 thin-head silver
screws and one M2x2 thin-head
silver screw to remove the metal FL
cover.
5.Carefully lift up the white sheet cover-
ing the FL.
6.Lift the yellow FL cable connector until
one end is out of the groove.
CAUTION:  Handle only the FL cable
instead of the FL glass tube to minimize risk
of damage or injury.
7.Lift the white FL cable out of its groove
to remove the cable and FL.ê
î