Fujitsu Siemens Computers B19-2 - Page 38

FSC B19-2
Page 38 of 55
No backlight
Check C201 (+) =12V
Check F201
Check D201/Q209/Q210
Check ON/OFF signal
Check Interface board
Check U201 pin9=12V voltage
Change Q201 or Q202
Check the pin7/10 of U201 if have waveforms
Short Q203/Q204 if the picture normal
Change U201
Connect PIN15 of U201 to the ground and check Q209/Q210/ Q211/Q212 collector waveforms
Check feedback circuit
Change Q209/Q210/PT201
Change Q211/Q212/PT202
Check connecter & lamp
OK
OK
OK
OK
NG
NG
NG
NG
NG
OK
NG
NG