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