5.Troubleshooting (continued)
5.3 Checkthe backlight unit
Checkthe BKLT_EN signal of
rectangleinput P301 pin11 at TTL
highlevel.
Checkthe PWM signal
suppliedfrom I314
pin251is a PWM,
pulse-widthmodulation.
OK
Doesthe I306 pin16
outputa TTLvoltage level
at“H” status? <or> Is BKLT _EN
signalof the rectangle being
output?
FailurePoint
Printedwire is broken
betweenI306 pin16 and
P301.
NG NG
FailurePoint
1.Printed wire is broke
betweenI314 pin251 and P301.
2.I314 is defected.
NG
FailurePoint
Inverterof LCD module is defected.
OK
OK
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ACERG24