HP VS17 Series - Page 51

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