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