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No Backlight
Check CN903 Pin1/3 =12V
Check IC701 PIN6=5V+0.25V
Check IC701 PIN1=5V
Check IC701 PIN 2 triangular wave is
normal
Check IC701 PIN4, 5
Check D703, D709, D702, D707
OK
Check ON/OFF signal
OK
OK
OK
OK
OK
NG
Check adapter
NG
Check Interface board
NG
Check Q713,Q712, Q702, ZD701 circuit
NG
Check Q707, Q706 circuit
NG
Check C720, C719, IC201 circuit
NG
Check Q701, Q705, PT701, PT702, IC701
51
HP VS17 Service Manual
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