Toshiba Qosmio Personal Computer X500 - Manual (Page 122)

Test Program for Field.
NOTE: The following screen does not display correctly. It will be
amended in the next version.
Qosmio X500 Maintenance Manual (960-Q08) 37
Press [Enter] Key
Press Enter to execute the VRAM mapping test which displays a vertical line
at four dot intervals using Mode 12.
Press [Enter] Key
Press Enter to display VRAM mapping test using the all dots Mode.