54
Mechanlcal
Nolse
When turn
panel,appear
cacophony
Caused by Mechanica noise of backlight
unit
Ripple Connectric circle
Causeed by between mechanism and
Panel
B/L off B/L lose action
*Connect badness between wire and
electrode
B/L dark
B/L brightness
darker than normal
*Connect badness
Short between wire and electrode
B/L wire
damaged
B/L wire damaged Operation abnormal or systemic noise
B/L wire
open
Without backlight Operation abnormal or systemic noise
B/L shut
down
B/L shutdown in
sometime
Short between lamp housing and wire, Because
consume power too much
F/M
F/M in B/L ,white,
back Rotundity or
wire like
F/M in B/L unit
Failure Mode
Part Name Description Phenomena Failure cause
Light
leakage
Brightness at
bottom of LCM
brighter than
normal
B/L unit badness
Uniformity
B/L brightness
asymmetric
Sheet in B/L unit is uneven
Mechanlcal
or B/L
Mount hole
Lack screw or
screw damage
*Lack screw
Screw damage
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