Verify Video Signal Path Integrity; Video Controller / Lcd Troubleshooting; Initializations Did Not Complete - Keysight n9020a Service Manual

Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
10.Are all of the 3 voltage levels within their expected ranges?
If yes:
Replace the A1A4 LCD Inverter or DC-DC Converter board.
If no:
Replace the A1A2 Front Panel Interface board.

Verify Video Signal Path Integrity

The video controller is located on the A4 Processor assembly and is routed to
the front panel LCD through a few interconnections. These interconnections
are:
— A4 Processor assembly to A7 Midplane Board
— A7 Midplane Board to A8 Motherboard assembly
— A8 Motherboard assembly to A1A2 Front Panel Interface assembly via W1
ribbon cable
— A1A2 Front Panel Interface to A1A3 LCD via A1W1 flex-circuit
If all of these connections are properly made and none of the cables are
damaged proceed to

Video Controller / LCD Troubleshooting

The video controller is located on the A4 Processor assembly. The video signals
that the controller outputs are LVDS. As described above, these signals are
routed to the LCD via the A7 Midplane Board, A8 Motherboard, and A1A2 Front
Panel Interface board.
On the A1A2 Front Panel Interface board the LVDS signals are buffered and
then sent to the LCD via the A1W1 Flex circuit.
The most likely cause for a video problem is the A4 Processor assembly;
however it could be the result of a defective LCD.

Initializations Did Not Complete

During the initialization of the MXA Signal Analyzer Application the following
messages will be displayed on the application splash screen:
— Checking for required services (1 of 7)
— Initializing License Services (2 of 7)
— Initializing Hardware (3 of 7)
— Initializing Data Services (4 of 7)
— Initializing SCPI Services (5 of 7)
— Initializing Message Services (6 of 7)
— Initializing Front Panel EEPROM Services (7 of 7)
"Video Controller / LCD
63
Troubleshooting".