Troubleshooting The Lcd Display; Blank Display - Agilent Technologies 8564EC Service Manual

Troubleshooting the LCD Display

There are no adjustments for intensity or focus of the LCD.
NOTE

Blank Display

1. If the LED above the front-panel LINE switch is lit, most of the A6
2. Carefully check the voltages on the front-panel PROBE POWER
3. Check that the fan is operating. If the PROBE POWER voltages are
4. If all of the power supply indicators along the outside edge of the A2
5. Connect a VGA monitor to the VGA port on the rear of the
6. If the LED is not lit, or the fan is not working, or the probe power
7. Open the left side of the instrument (see
Figure 13-2 Probe Power Socket
Chapter 13
power supply is functioning properly.
jack. Be careful to avoid shorting the pins together. See
correct, and the fan is turning, the A6 power supply is probably
working properly.
controller assembly are lit, the A6 power supply is probably working
properly.
instrument. If the display is still blank, suspect the A2 controller, a
loose cable, or the display driver.
voltages are not correct, or the power supply indicators on the edge
of the A2 controller assembly are not working properly, proceed to
the section on troubleshooting the power supply on
Frame/A18 LCD" on page
measurements at pins 1, 2, 3, 4, 5, 41, 42, 43, 44, and 45 on J8 of the
A2 controller (see Figure 13-3 on page
measure 5V ±0.25V. If any of these measurements is out of tolerance
suspect the A2 controller board or the power supply. If the voltages
for these pins are correct, make the same measurements at the
identical pins on J1 of the A17 display driver board. If these
measurements are correct, suspect the A18 LCD assembly or the
A17A1 inverter board. If these measurements are not correct,
suspect the A17 LCD driver or A17A1 inverter board.
Display/Power Supply Section
Troubleshooting the LCD Display
"Procedure 2. A1 Front
166). Make voltage
640). These pins should
Figure 13-2
page 658.
637