Acer AL1922R AL1922r Service Guide - Page 40

No Backlight Check C201 (+) =12V OK NG Check ON/OFF signal OK NG Check U201 pin9=12V ? NG OK Change F902 Check D201/Q209/Q210/ D202/Q211/Q212 Check Interface board Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave OK NG Change U201 Check D201 (-), D202 (-) has the output of square wave at short time. OK NG CheckQ205/Q207/Q203/D201or /Q206/Q208/Q204/D202 Check the resonant wave of pin2 & pin5 for PT201/ PT202 OK NG Check Q209/Q210/C213 or Q211/Q212/C214 Check the output of PT201/PT202 OK NG Change PT201/PT202 Check connecter & lamp 40