Motherboard Troubleshooting - Keysight Infiniium S Series Service Manual

Motherboard Troubleshooting

If the oscilloscope still does not stay powered up after troubleshooting the power
supply, the problem may be with the motherboard.
Failure Type Detailed Info
Unable to boot up No power supply
No respond to power button
No beep sound / Long beep
(more than 1s)
OS not found SATA port (CN6, CN8) not
working
No display / Blank Wrong switch configuration
screen (Front Panel) (SW1 , SW3)
Front panel display OFF, VGA
display ON / abnormal
Blue screen (BSOD) Crash code / STOP code
S-Series Oscilloscopes Service Guide
How to Identify
Check on Argo motherboard LED (D11) on top side near SATA
connector sockets.
Skip if not visible in some instrument chassis structure. See the
Motherboard Reference that follows.
Check on Argo motherboard LED (D17) on top side at near to rear
panel I/O ports.
Skip if not visible in some instrument chassis structure. See the
Motherboard Reference that follows.
Check for fan activity. Fan should spin when power button is
pressed.
Check for beep sound after power button is pressed.
•
No beep = No boot
•
Long beep = Memory error upon booting up; May be related to
PCH cache or RAM
•
Multiple beeps = Other error, unit may still boot up.
Using working OS hard drive, check unit bootability with SATA
port CN6 and CN8. See the Motherboard Reference that follows.
Check the LVDS enable switch (SW1) configuration. SW1 should
be set to ON (label marking side). See the Motherboard Reference
that follows. If the configuration is wrong or switch is floating,
front panel display will be turned off or white screen may occur.
Check the Display switch (SW3) configuration. SW3 should be set
accordingly to production settings. See the Motherboard
Reference that follows. Incorrect configuration will result in
display issue such as oversize, cropped, color distortion, etc.
Check the LVDS enable switch (SW1) configuration.
Check and record the BIOS version via VGA.
Check the Windows desktop display resolution.
If VGA monitor screen is extended, do the following:
1
Press "[Window] + [R]" keys, type "cmd", press "[CTRL] +
[Enter]" to open Command Prompt (Administrator).
2
In the Command Prompt (Administrator), type
"displayswitch.exe/clone" and press "[Enter]".
Capture BSOD crash/STOP code. Provide hardcopy if could not
attach online.
4
Troubleshooting
63