To Check The Touch Panel; To Check The Lcd - Keysight E5052B Service Manual

Step 5. To exit the front panel test, press
• If multiple keys fail to work, a problem in A22 front panel keyboard or A21 PCI DSP
card is suspected. Also check the flat cable between the A21 and A22.
• If only a specific key doesn't work, check first if the key is subsided in the panel.
• If the rotary knob doesn't work, check the A22 board involving the RPG.

To Check the Touch Panel

Procedure
By touching the LCD display panel, select or change the setting of a function in the softkey
menu and, then, perform the same operation with hardkeys.
• If the touch panel doesn't work correctly whereas the hardkeys function normally, a
failure seems in the touch screen controller assembly (5183-4184) or touch-panel LCD
assembly (E5070-60112). (The touch panel is not replaceable independently of the
LCD.)
• Check the cable between the touch screen controller and the serial interface connector
on the A20 digital motherboard.
• If no problem is found in the above checks, a failure in the A20 digital motherboard is
suspected.

To Check the LCD

Procedure
Step 1. Press key.
Step 2. Click
Service Menu
Step 3. Click in the test menu. The whole of the LCD screen turns Red, Green, Blue,
Display Test
White and Black every 2 seconds and returns to the measurement view. If the color test
screen doesn't appear correctly, perform step 4.
Step 4. Connect an external XGA monitor to the VIDEO output port on the E5052B rear panel.
• If the monitor screen view is the same as the LCD display, the problem seems in the
A21 PCA DSP Card. Check first if the A21 is securely connected to the A20 Digital
Moterboard Assembly.
• If only the LCD display has a problem, check the flat cable between the A22 front
panel keyboard and A26 Digital Bridge Board.
• If the LCD is not illuminated with backlight, check A52 inverter board and the cable
between the A52 and A22. Also check the cables between the A51 LCD and A52.
• If the cables are normal, check the A51 LCD.
Chapter 4
Function Specific Troubleshooting
key three times.
and, then, in the softkeys menu.
Test Menu
Troubleshooting
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