Service manual

ManualsBrandsSharp ManualsComputer equipmentLL-153A

15” LCD Color Monitor Sharp LL-153A

33

2.) W / LED , No Backlight

Check C811(+) =12V

NG

OK

Change L921 circuit

Check ON/OFF signal

Check Main board

NG

OK

Check IC801 pin2=5V

NG

OK

Change Q801,Q802,Q803 circuit

Check the pin1,15 of IC801 have saw tooth

wave

Check IC801 pin6,7,10

Check the pin5 of IC801

NG

OK

Check D802,D804,Q806 circuit

Check the resonant wave for PT801

NG

OK

Check the output of PT801

Check Q805 circuit

Check connecter & lamp

OK

NG

Change PT801

OK

NG