Acer AL1906 AL1906 Service Guide - Page 37

No Backlight Check C201 (+) =12V NG OK Change F902 Check Q203/D201 Check ON/OFF signal NG OK Check U201 pin9=12V ? Check Interface board NG OK Check the pin1 of U201 have saw tooth wave Change Q201 or Q202 NG Change U201 OK Check D201 (-) has the output of square wave at short time. NG CheckQ205/Q207/Q203/Q201or OK /Q206/Q208/Q204/D202 Check the resonant wave of pin2 & pin5 for PT201/ PT202 OK NG Check Q206/Q207/C211 Check the output of PT201/PT202 NG OK Check connecter & lamp Change PT201/PT202 36