5. Troubleshooting (continued)

5.10 Checking the inverter board circuit

ACER G24

 

29

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Does 22V output pin

have voltage around 20V?

Does On/Off pin have voltage over 3V? Does brightness pin have voltage in the range of 0V~3.2V?

OK

Does I101 pin6 have 5V output?

OK

Does P101, P102, P103,

P104 be firmly connected?

OK

Does I101 pin4, pin5 have triangle pulse?

OK

Does I101 pin1 have soft start edge up to 2.4V?

OK

Does I101 pin8 have

voltage up to 1.2V from output

detection?

NG

Does

half bridge (Q104,

Q105, Q106, Q107, Q108)

work successful?

OK

Does transformer (T101, T102) have output AC voltage to P101, P102, P103,

P104?

OK

Check panel module if damage

 

 

 

Check F101, I101, Q110, Q111, Q112,

NG

 

 

 

 

Q113 and repair them if be damaged

 

 

 

 

 

 

 

NG Check I101 and repair them if be damaged

NG Check CCFL and repair if damage.

NG Check I101 and repair if damage

NG Repair 101

 

 

 

Check D102, D103, D107, D108, D114,

OK

 

 

 

 

D115, D112, D113 and repair if damage.

 

 

 

 

 

 

 

 

 

 

Check Q104, Q105, Q106, Q107, Q108 and

NG

 

 

 

 

repair them if damage

 

 

 

 

 

 

 

NG Check T101 and T102 if damage

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Acer MB243WABNS service manual Troubleshooting Checking the inverter board circuit