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Chapter 5: Troubleshooting

To check the display board video signals

The video signals are checked on the 32-pin connector on the display board. 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 5-7

Video Signals

Pin Number Signal Pin Number Signal

1NC 26NC

2CLK

(LVDS pair)

27 NC

3CLK

28 NC

4 GROUND 29 NC

5A3-

(LVDS pair)

30 NC

6 A3+ 31 NC

7 GROUND 32 NC

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 ... 94 95 96 97 98 99 100 101 102 103 104 ... 165 166

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