Table of Contents
Advertisement
2.) No Backlight
Check C201 (+) =12V
Check ON/OFF signal
Check U201 pin9=12V
Check the pin1 of U201 have saw tooth wave
Check D201 (-) have the output of square wave at short time
Check the resonant wave of pin2 & pin5 for PT201
Check the output of PT201
Check connecter & lamp
OK
NG
OK
NG
OK
NG
OK
NG
NG
OK
NG
OK
NG
OK
Change F902
Check main board
Change Q201 or Q202
Change U201
Check Q205/Q207/Q203/D201 Check
Check Q209/Q210/C213
Change PT201
Page 33 of 48
LM722
Advertisement
Table of Contents
