To Check The Display Board Video Signals - Keysight 9000 Series Service Manual

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 4-2 Video Signals
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Chapter 4: Troubleshooting
Signal
NC
CLK
-
(LVDS pair)
CLK
+
GROUND
A3-
(LVDS pair)
A3+
GROUND
A2-
(LVDS pair)
A2+
GROUND
A1-
(LVDS pair)
A1+
GROUND
A0-
(LVDS pair)
A0+
NC
NC
NC
NC
NC
GROUND
GROUND
+3.3 V
+3.3 V
+3.3 V
To check the display board
Pin Number Signal
26 NC
27 NC
28 NC
29 NC
30 NC
31 NC
32 NC
video signals
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