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Chapter 4: Troubleshooting

To check the display board video signals

The video signals are checked on the 32-pin connector J2 on the display board MP12. You can

use an oscilloscope with a bandwidth of at least 100 MHz to verify the signals. Even-numbered

pins are closest to the PC board. If the signals are not present, suspect the display card. If the

signals are present and the backlights are on, suspect the flat-panel display as the problem. Note

that CLK, A0, A1, A2, and A3 are Low Voltage Differential Signals (LVDS).

Table 4-18

Video Signals

Pin Number Signal Pin Number Signal

1NC 26NC

2CLK-

(LVDS pair)

27 NC

3CLK+ 28NC

4GROUND 29NC

5A3-

(LVDS pair)

30 NC

6A3+ 31NC

7GROUND 32NC

8A2-

(LVDS pair)

9A2+

10 GROUND

11 A1-

(LVDS pair)

12 A1+

13 GROUND

14 A0-

(LVDS pair)

15 A0+

16 NC

17 NC

18 NC

19 NC

20 NC

21 GROUND

22 GROUND

23 +3.3 V

24 +3.3 V

25 +3.3 V

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 147 148

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Agilent Technologies Ininiium 90000 Especificaciones Pagina 74