Acer AL1702 AL1702W Service Guide - Page 37

5. No Backlight Check C802 (+) =12V NG OK Check ON/OFF signal NG OK Check IC801 pin12=5V? NG OK Change FB801,Check Q805 Q808, Q810 Check Interface board Change Q805.Q808 or Q810 Check the pin9&10 of IC801 have PWM wave NG NG Change IC801 Replace IC801 OK OK Check the resonant wave of pin6 & pin1 for PT801 NG OK CheckQ801/Q802/Q804/ Q811or /Q812 Check Q809Q801/Q802/Q811/Q812 Check the output of PT801 NG OK Change PT801 Check connecter & lamp 37