Keysight Infiniium 8000 Series, Service Manual

Page: 82 / 162

Chapter 5: Troubleshooting
To check the display board video signals
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To check the display board video signals
(Note that systems that use the ADLINK M880 motherboard do not have a display
board. The display board is integrated with the M880 motherboard.)
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 5-6 Video Signals
Pin Number Signal Pin Number Signal
1 NC 26 NC
2 CLK-
(LVDS pair)
27 NC
3 CLK+ 28 NC
4 GROUND 29 NC
5 A3-
(LVDS pair)
30 NC
6 A3+ 31 NC
7 GROUND 32 NC
8 A2-
(LVDS pair)
9 A2+
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