Toshiba Libretto 50CT/70CT Manual

							4.9  System Board4  Replacement Procedures4-20Libretto 50CT/70CT Maintenance Manual4 
4.9 System BoardRemoving the System BoardTo remove the system board, follow the steps below and refer to Figure 4-16.
1. Turn the computer off.  Disconnect the AC adapter and optional units from the
computer.
2. Remove the battery, optional PC card, HDD, optional memory module, keyboard,
display assembly, and RTC battery as described in Sections 4.2 through 4.8.
3. Gently lift up on the system board near the DC Jack Harness and remove the board.
NOTE: Be careful of the IR lens cover, it may fall out of the base. Also, thestereo jack plate is not attached and may fall off the system board.4. Disconnect the DC Jack Harness from PJ401 on the system board.Figure 4-16  System board removal
Installing the System BoardTo install the system board, follow the steps below and refer to Figure 4-16.
1. Attach the DC Jack Harness to PJ401 on the system board, then place the system
board in the base.
NOTE: Be sure the stereo jack plate and the IR lens cover are in place.2. Install the RTC battery, display assembly, keyboard, optional memory module, HDD,
optional PC card, and battery as described in Sections 4.8 back through 4.2. 
						

							4  Replacement Procedures4.10  Display MaskLibretto 50CT/70CT Maintenance Manual4-214.10 Display MaskRemoving the Display MaskTo remove the display mask, follow the steps below and refer to Figures 4-17 and 4-18.
1. Turn the computer off.  Disconnect the AC adapter and optional units from the
computer.
2. Remove the battery as described in Section 4.2.
3. Remove two mask seals on the right and left in the lower part of the display mask, to
reveal two M2.5x5 screws.
4. Remove two M2.5x5 screws concealed under the seals.Figure 4-17  Mask seal removal
5. Remove the pointing cap.
6. Carefully insert the fingers of both hands between the mask and LCD panel and release
the latches, starting with the five latches in the upper part of the display mask. 
						

							4.10  Display Mask4  Replacement Procedures4-22Libretto 50CT/70CT Maintenance Manual7. Continue to release the display mask, using the fingers of both hands, on the sides    (1
each) and at the bottom (6).Figure 4-18  Display mask removalInstalling the Display MaskTo install the display mask, follow the steps below and refer to Figures 4-18 and 4-17.
1. Set the display mask in place.
2. Press firmly to secure the latches as follows: the bottom (6 latches), sides (1 each), and
top (5 latches).
3. Replace the pointing cap.
4. Secure the display mask with two M2.5x5 screws.
5. Replace the two mask seals.
6. Replace the battery as described in Section 4.2 
						

							4  Replacement Procedures4.11  FL Inverter BoardLibretto 50CT/70CT Maintenance Manual4-234.11 FL Inverter BoardRemoving the FL Inverter BoardTo remove the FL inverter board, follow the steps below and refer to Figure 4-19.
1. Turn the computer off.  Disconnect the AC adapter and optional units from the
computer.
2. Remove the battery and display mask as described in Sections 4.2 and 4.10.
3. Remove one silver M2x3 screw that secures the FL inverter board.
4. Remove the FL inverter board from the board clamp, then carefully turn it to
disconnect the FL cable from CN1 and the display flexible cable from CN2.Figure 4-19  FL inverter board removal 
						

							4.11  FL Inverter Board4  Replacement Procedures4-24Libretto 50CT/70CT Maintenance ManualInstalling the FL Inverter BoardTo install the FL inverter board, follow the steps below and refer to Figure 4-19.
1. Connect the display flexible cable to CN2 and the FL cable to CN1 on the FL
inverter board.
2. Replace the FL inverter board and secure it with one silver M2x3 screw.
3. Install the and display mask and battery as described in Sections 4.10 and 4.2. 
						

							4  Replacement Procedures4.12  LCD ModuleLibretto 50CT/70CT Maintenance Manual4-254.12 LCD ModuleRemoving the LCD ModuleTo remove the LCD module, follow the steps below and refer to Figure 4-20.
1. Turn the computer off.  Disconnect the AC adapter and optional units from the
computer.
2. Remove the battery, display mask, and FL inverter board as described in Sections 4.2,
4.10 and 4.11.
3. Remove four silver M2x3 screws that secure the LCD module to the LCD cover.
4. Carefully turn the LCD module to remove it from the display cover, and disconnect
the display flexible cable from CN1 on the LCD module.Figure 4-20  LCD module removal 
						

							4.12  LCD Module4  Replacement Procedures4-26Libretto 50CT/70CT Maintenance ManualInstalling the LCD ModuleTo install the LCD module, follow the steps below and refer to Figure 4-20.
1. Connect the display flexible cable to CN1 on the LCD module.
2. Replace the LCD module and secure it to the LCD cover with four silver M2x3
screws.
3. Install the FL inverter board, display mask, and battery as described in Sections 4.11,
4.10, and 4.2. 
						

							4  Replacement Procedures4.13  Power Switch BoardLibretto 50CT/70CT Maintenance Manual4-274.13 Power Switch BoardRemoving the Power Switch BoardTo remove the power switch board, follow the steps below and refer to Figures 4-21 and
4-22.
1. Turn the computer off.  Disconnect the AC adapter and optional units from the
computer.
2. Remove the battery, display mask, FL inverter board, and LCD module as described in
Sections 4.2 and 4.10 through 4.12.
3. Disconnect three flexible cables from PJ3, PJ11, and PJ12 then remove the power
switch board.Figure 4-21  Power switch board removal 
						

							4.13  Power Switch Board4  Replacement Procedures4-28Libretto 50CT/70CT Maintenance Manual4. Disconnect the speaker cable from PJ5 on the power switch board and remove the
speaker.Figure 4-22  Speaker removalInstalling the Power Switch BoardTo install the power switch board, follow the steps below and refer to Figures 4-23 back
through 4-21.
1. Connect the power switch cable to PJ5 on the power switch board.
2. Place the power switch into position on the power switch board.
3. Insert the speaker fix shaft into the power board to secure the speaker.Figure 4-23  Inserting the speaker fix shaft
4. Connect the flexible cables to PJ3, PJ11, and PJ12. 
						

							4  Replacement Procedures4.13  Power Switch BoardLibretto 50CT/70CT Maintenance Manual4-295. Install the LCD module, FL inverter board, display mask, and battery as described in
Sections 4.12, 4.11, 4.10, and 4.2.