Troubleshooting
6-- 52
TDS7104 & TDS7054 Service Manual
Table 6--4: Failure symptoms and possible causes (Cont.)
Symptom Possible cause(s)
PPC appears “dead”; power
light comes on, but monitor
screen(s) is (are) blank,
oscilloscope emits no beeps
H SO DIMMs incorrectly installed or missing. Missing DIMMs
will cause a POST fault and NLX will beep
H Defective Power PC (PPC) board
H Hold down on-standby button on the PPC, 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 riser board
H Faulty PPC board
CD-ROM related symptoms
H Defective CD-ROM
H Defective CD-ROM drive cable
H Defective CD-ROM 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 N LX 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--63
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