A51 Lcd Removal; Tools Required; Procedure; A52 Inverter Board Removal - Agilent Technologies E4991A Service Manual

A51 LCD Removal

Tools Required

• Pozidriv screwdriver, pt size #1 (small) and #2 (medium)

Procedure

Step 1. Remove the front panel as described in"Front Panel Removal".
Step 2. Remove the six screws fastening the LCD cover to the front panel.
Step 3. Disconnect the flat cable (item 8 in Figure 6-2 on page 236) from the A22 Front Panel
Keyboard.
Step 4. Disconnect the two backlight cables from the Inverter board as described in "A52 Inverter
Board Removal".
Step 5. Remove the four screws fastening the LCD to the LCD cover and remove the LCD.
Step 6. Remove the mylar ribbon cable (item 4 in Figure 6-2) from the LCD and remove the LCD.
NOTE The mylar ribbon cable and their connector are fragile. You must be attentive as described
in NOTE on page 303 when you are instructed to disconnect or connect it.

A52 Inverter Board Removal

Tools Required
• Pozidriv screwdriver, pt size #1 (small) and #2 (medium)
Procedure
Step 1. Remove the front panel as described in"Front Panel Removal".
Step 2. Remove the two screws fastening the Inverter board cover to the LCD cover and remove
the cover.
Step 3. Disconnect the backlight primary cable (item 7 in Figure 6-2) from the Inverter board.
Step 4. Disconnect the two backlight cables from the Inverter board.
Step 5. Remove the two screws fastening the Inverter board to the LCD cover and remove the
Inverter board.
Chapter 7
Replacement Procedure
A51 LCD Removal
305