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5. Troubleshooting (continued)
5.3 Check the backlight unit
Check the BKLT_EN signal of
rectangle input P301 pin11 at TTL
high level.
Check the PWM signal
supplied from I314
pin251 is a PWM,
pulse-width modulation.
OK
Does the I306 pin16
output a TTLvoltage level
at “H” status? <or> Is BKLT_EN
signal of the rectangle being
output?
Failure Point
Printed wire is broken
between I306 pin16 and
P301.
NG
NG
Failure Point
1. Printed wire is broke
between I314 pin251 and P301.
2. I314 is defected.
NG
Failure Point
Inverter of LCD module is defected.
OK
OK
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22
ACER G24