Service manual

R910E Service Manual
32
7.2.3 POWER/INVERTER BOARD
No Backlight
Check CN1 pin12 =12V
NGOK
Check adapter or MB
Check ON/OFF signal
Check Interface board
NGOK
Check IC1 pin9=12V
NG
OK
Change Q201 or Q202
Check the pin10/PIN7 of IC1 have saw tooth wave
NG
OK
Change U201
Check D201(-), D202(-) has the output of square wave at short time.
NG
OK
Check Q203/Q204/Q209/Q210/Q211/Q212
Check the resonant wave of pin2 & pin5 for PT201/ PT202
NG
Check the output of PT201/PT202
Check Q209/Q210/Q211/Q212/C213/C214
Check connecter & lamp
OK
NG
Change PT201/PT202
OK