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ACER G24

5. Troubleshooting (continued)

Go to cover page

5.9 Checking the DC/DC converter circuit

Check if the 5V is output

from P301 pin1, pin2, pin3, pin4

to I301, I303, I320 pin3.

OK

Check if the 3.3V, 2.5V

and 1.8V line voltage is output

from I301, I302, I303 pin2

OK

Failure Point

Printed wire is broken between I301, I302, I303 pin2, and I314 power supply pin.

Failure Point

Printed wire is broken between

NG P301 pin1, pin2, pin3, pin4 and

I301, I303, I320 pin3.

Is the output

NG FB301 being supplied to

I301, I303, I320 pin3?

OK

NG

 

Failure Point

 

Failure Point

 

 

Printed wire is broken

I301, I303, I320 is defected.

 

between I301, I303, I320

 

 

pin3 and output of FB301

 

 

 

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Image 29
Acer MB243WABNS service manual Between I301, I303