Chapter 5: Troubleshooting
To check the display board video signals
85
To check the display board video signals
The video signals are checked on the 32-pin connector J2 on the display board A12. 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 5-12
Video Signals
Pin Number Signal Pin Number Signal
1NC 26NC
2CLK-
(LVDS pair)
27 NC
3CLK+ 28NC
4 GROUND 29 NC
5A3-
(LVDS pair)
30 NC
6A3+ 31NC
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
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