Acer AL1722 AL1722 Service Guide - Page 43

5. Inverter Board No Backlight Check CON102 Pin5/6 =12V? NG OK Check ON/OFF signal NG OK Change F902 Check D201/Q209/Q210/ D202/Q211/Q212 Check Interface board Check U201 pin9=12V ? NG OK Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave OK NG Change U201 Check D201(-), D202(-) have the output of square wave at short time. NG Check Q205/Q207/Q203/D201 OK or Q206/Q208/Q204/D202 Check the resonant wave of pin2 & pin5 for PT201/ PT202 NG OK Check Q209/Q210/C213 or Q211/Q212/C214 Check the output of PT201/PT202 NG OK Change PT201/PT202 Check connecter & lamp 43