Keysight N5224B, Service Manual, Page: 518 / 614

7-12 Keysight N5224B/25B Service Guide
Repair and Replacement Procedures
Removing and Replacing the A1–A3 and Other Front Panel Subassemblies
7-
board (item [11]), touch screen controller board to interface board cable
(item [13]), power switch board to interface board cable (item [12]), and
the speaker assembly cable.
4. Remove the seven screws (item

) from the keypad/board and the two
standoff-hex nuts (item

) from the keypad/board assembly and remove
it from the front panel assembly.
5. The keypad assembly can now be removed from the A1 front panel
interface board by gently pulling each of the rubber tabs through the PC
board.
Removing the LED Driver Inverter Board
1. Disconnect the LED driver inverter board to interface board cable
connection (item [11]) and the LCD display cable (item [19]) from the LED
driver inverter board.
2. Remove two screws (item

) and remove the LED driver inverter board.
Removing the Touchscreen Controller Board
1. Disconnect the touchscreen controller board cable (item [13]) from the
touchscreen controller board and front panel interface board.
2. Raise the retaining clamps on the LCD display flat flex cable’s two
connectors (item [15]).
3. Disconnect the flat flex cable from the touchscreen (item [15]).
4. With the T-8 TORX, remove the 4 screws (item

) on the touchscreen
controller board.
5. Remove the touchscreen controller board from the mounting plate.
Removing the Power Switch Board and Power Button Keypad
1. Disconnect the following cables from the A1 front panel interface board:
tape (item [14]) from connector and the LCD display to interface board
cable (item [18]), LED driver board (backlight converter board) to interface
board (item [11]), touch screen controller board to interface board cable
(item [13]), power switch board to interface board cable (item [12]), and
the speaker assembly cable.
2. With the T-10 TORX, remove the eleven outer screws on the LCD
mounting plate (item

) and remove the A3 display assembly from the
front panel assembly.
3. Disconnect the power switch cable (item [13]) from the power switch
board.
4. Remove two screws (item

) and remove the power switch board.
5. The power button keypad can now be removed from the power switch
board by gently pulling each of the rubber tabs through the PC board.