eMachines E181H Service Guide - Page 40
No Backlight
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2.) No Backlight Check F801=12V NG OK Check ON/OFF signal NG OK Check IC801 PIN12=15V NG OK Check adapter and F801 Check Interface board or main board Change on/off circuit Check IC801 PIN5 have triangle wave NG OK Change IC801 Check IC801 PIN9/PIN10 PWM wave NG OK Check IC801 Check Q802,Q803 Drain wave NG OK Check Q801/Q804/Q811/Q812 Check the output of T801, T802 NG OK Change T801, T802 Check connecter & lamp, feedback and protect circuit 40
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40
2.) No Backlight
Check F801=12V
NG
OK
Check adapter and F801
Check ON/OFF signal
Check Interface board or main board
NG
OK
Check IC801 PIN12=15V
NG
OK
Change on/off circuit
Check IC801 PIN5 have triangle wave
NG
OK
Change IC801
Check IC801 PIN9/PIN10 PWM wave
NG
OK
Check IC801
Check Q802,Q803 Drain wave
NG
Check the output of T801, T802
Check Q801/Q804/Q811/Q812
Check connecter & lamp, feedback and protect circuit
OK
NG
Change T801, T802
OK