Troubleshooting
6--50
TDS5000B Series Service Manual
Table 6--4: Failure symptoms and possible causes (Cont.)
Symptom Possible cause(s)
PC motherboard appears
“dead”; power light comes on,
but monitor screen(s) is (are)
blank, oscilloscope emits no
beeps
H DIMM memory module incorrectly installed or missing.
Missing DIMMs will cause a POST fault and PC mother-
board will beep
H Defective PC motherboard
H Hold down on-standby button on the PC Interface board , if
system boots, replace the power supply
Hard disk drive related
symptoms
H Defective hard disk drive
H Incorrect hard disk type selected in the BIOS setup
H Replaceable hard disk drive not installed
H Power supply failure
H Corrupted BIOS module firmware, reinstall firmware
H Hard disk drive not configured as bootable (slave) master
hard disk drive
H Loose cable
H Faulty PC motherboard
CD-ROM related symptoms
H Defective CD-ROM
H Defective disk drive adapter board
H Defective cable from PC Interface board to display adapter
board
H Defective PC Interface board
H Incorrect CD-ROM configuration in the BIOS setup
Flat panel display blank
H Display selection jumper set incorrectly on front panel board
(there are no jumpers on the board when the oscilloscope is
shipped from the factory; this is the correct default setting)
H Video adapter set to AGP (connect monitor to VGA port,
enter BIOS, set Video Adapter = PCI)
H BIOS setting not Advance > Video Configuration > Primary
Video Adapter = PCI
H Defective cable from front panel board to display adapter
board
H Defective cable from inverter board to display adapter board
H Defective cable from inverter board to backlighting display
lamp
H Defective backlighting display lamp
H Faulty display
H Faulty controller board
H Faulty inverter board
H Faulty display adapter board
BIOS error messages
H Refer to the BIOS error message table on page 6--60
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