Sharp LL-153A Service Manual page 33

15" LCD Color Monitor
2.) W / LED , No Backlight
Check C811(+) =12V
OK
Check ON/OFF signal
OK
Check IC801 pin2=5V
OK
Check the pin1,15 of IC801 have saw tooth
OK
Check the pin5 of IC801
OK
OK
Check the output of PT801
OK
Check connecter & lamp
NG
NG
NG
NG
NG
Check the resonant wave for PT801
NG
NG
Change L921 circuit
Check Main board
Change Q801,Q802,Q803 circuit
wave
Check IC801 pin6,7,10
Check D802,D804,Q806 circuit
Check Q805 circuit
Change PT801
33
Sharp LL-153A