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ACER G24

5. Troubleshooting (continued)

Go to cover page

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, pulse-width modulation.

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.

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Acer MB243WABNS service manual Troubleshooting