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No Backlight
Check U201 pin9=12V voltage of C905(+)
Check D201 (-) have the output of square wave at short time.
Check the resonant wave of pin2 & pin5 for PT201
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Check C201(+) =12V
OK
Check ON/OFF signal
OK
OK
Check the pin1 of U201 have saw tooth wave
OK
OK
OK
Check the output of PT201
OK
Check connecter & lamp
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NG
Change F902
Check D201/Q209/Q210
NG
Check Interface board
NG
Change Q201 or Q202
NG
Change U201
NG
CheckQ205/Q207/Q203
NG
Check Q209/Q210/C213
NG
Change PT201
40
Dell E153FPc
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