Acer V277 Lifecycle Extension Manual page 18
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Also See for V277:
- User manual (35 pages) ,
- Manual (15 pages) ,
- Quick start manual (2 pages)
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5.4 LED backlight debug
flow：
LED driver Debug
N
Check Net
19V_BLD is
19V?
Y
BU3 is damaged?
Y
N
Y
BD4 is damaged?
N
Y
BR31 is open?
N
N
Check BU5 pin5
is high ?
Y
Backlight on?
Y
END
Replace FB36
Y
FB36 is
open?
N
Replace BU3
Replace BD4
Replace BR31
Check NET BL_CTRL
Open BR67
level is high?
N
Check U12 works
N
Reassemble BR67
Y
Y
Replace BU5
18
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