Technical information

6. No Backlight
NG
OK
Change F901
Check Q803
Check IC801 pin9=12V ?
OK
NG
Check Interface board
Check ON/OFF signal
Check C801 (+) =12V
Change PT801/PT802
NG
OK
Check connecter & lamp
Check the output of PT801/PT802
NG
Check the resonant wave of pin2 & pin5 for PT801/ PT802
CheckQ805/Q807/Q803/Q801or
/Q806/Q808/Q804/D802
OK
NG
Check D801 (-) has the output of square wave at short time.
Change IC801
OK
NG
Check the pin1 of IC201 have saw tooth wave
Change Q801 or Q802
OK
NG
Check Q806/Q807/C841
OK
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