eMachines E181H Service Guide - Page 38
L 2. W/LED No Backlight
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(L) 2. W/LED No Backlight Check R805 =16V OK Check ON/OFF signal NG NG OK Check IC801 PIN12=5V Check adapter circuit Check Interface board Change ON/OFF NG Check IC801 PIN9O，K10 have the output of square wave at short time NG OK Check Q804,Q809 have the output of square wave at short time. Check IC801 NG OK Check the output of PT801/PT802 NG OK Check conneOcKter & lamp Check Q804，Q809,D815,D814,D817,D816 Change PT801 or PT802 38
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38
(L) 2. W/LED No Backlight
Check R805 =16V
Check the output of PT801/PT802
Check ON/OFF signal
Check IC801 PIN12=5V
Check adapter circuit
Check Interface board
OK
OK
NG
NG
Change ON/OFF
NG
NG
OK
Check Q804,Q809 have the output of
square wave at short time.
Check IC801
Check Q804
，
Q809,D815,D814,D817,D816
OK
OK
NG
NG
Change PT801 or PT802
Check connecter & lamp
Check IC801 PIN9
，
10 have the output of square wave at short time
OK