Texas Instruments 5000 - Manual (Page 128)

5.5.13 Removing/Replacing the Main Board
To remove and replace the Main Board Assembly, reference Figure 5-16 and
perform the following procedure:
1. Open up the base assembly as described in the previous paragraph
(Paragraph 5.5.6).
2. Remove the Keyscan Board, the IR Board, the Floppy Drive, the
Sound/PCMCIA Boards as described in previous paragraphs. Also
remove the Display Bezel (Paragraph 5.5.14) and remove the right
side screw from the DAB Board to free the grounding strap that
attaches to the Main Board.
3. Remove the LED Board and install on the replacement Main Board
Assembly.
4. Remove the Keyscan Board, the IR Board, the Floppy Drive, the
Sound/PCMCIA Boards as described in previous paragraphs.
5. Disconnect the LCD cables from P90 and P91 (upper center of the Main
Board).
6. Remove the six screws from around the perimeter of the Main Board.
7. Remove the screw holding the Latch Spring between the two metal
brackets at the top of the Main Board. Transfer this spring to the
replacement board.
8. Using tweasers, remove the connector door spring from the rear
connector doors and from around the plastic post near the top center
of the Main Board. Save this spring for later installation.
9. Replacement is essentially the reverse of Steps 1 through 8 above.
10. When installing the replacement Main Board, insert the front of the
board into the base at an angle and then set the board down over the
positioning pins built into the base. Ensure that the rear connector
doors are installed correctly (lip towards bottom of base), the Latch
Spring is correctly installed on the replacement Main Board, the door
spring hooked to each rear connector door and looped over the notch
at the base of the round plastic standoff. Also check that the heat
sink is correctly installed on the replacement board.
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Caution: Ensure that you remove the protective plastic film on the top
of the heat sink on the replacement Main Board. Otherwise, proper
heat transfer will not occur that could damage the unit.
11. Replace all connectors and boards; ensure that connectors are snug.
Reattach the base cover, keyboard, grounding strap underneath the
right side of the DAB Board. Install the Display Bezel and verify that
the notebook is functioning properly.
5-22 Field Service