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Agilent Technologies 46A, 45A, 54835A manual To check the backlight inverter voltages

Models: 54835A 46A 45A

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To check the backlight inverter voltages

Chapter 5: Troubleshooting

To check the backlight inverter voltages

To check the backlight inverter voltages

The backlight inverter board A3 is located in the front-left corner of the oscilloscope (as you face the front panel).

•There is one input connector on the side of the board.

•There are two output connectors, one at each end of the board (top and bottom), which power the two backlights inserted into the flat panel display.

The output voltage is approximately 300-450 Vrms, 40 kHz (measured differentially between the two wires) when the backlight is illuminated. The voltage is approximately 1 kV before the backlight tube is illuminated.

The outputs are controlled by the input. Notice that input pin 5 goes low to enable the output voltage. These pins can be reached at J1 on the SVGA display board A5.

Table 5-6

Backlight Inverter Board Input Voltages

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input Pin #

7

6

5

4

3

2

1

 

Backlight OFF

0 V

0 V

12 V

0 V

0 V

12 V

12 V

 

Backlight ON

0 V

0 V

0 V

0 V

0 V

12 V

12 V

5–23

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Agilent Technologies 46A, 45A, 54835A manual To check the backlight inverter voltages
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