Acer AL1751 - Inverter Board

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5. Inverter Board
No Backlight
Check CN801 Pin1 =12V
Check U801 PIN11, 12, 19, 20
Check D801-D804, D811,
D805, D810, D808
Check ON/OFF signal
Check U801 PIN3 voltage is normal?
Check adapter
Check Interface board
OK
OK
NG
NG
Check Q804,Q803,Q802 circuit
NGOK
Check U801 PIN18 triangular
wave is normal
Check C816, C821
Check U801,Q801, Q805, Q806, Q807
OK
OK
NG
NG