White Led Fl Owchart - Sony BDP-S1200 Service Manual

6-7. White LED fl owchart
White LED does not light
No
Check +5V voltage at CN701 pin4?
Yes
No
Check +3.3V voltage after R720
Yes
No
Check polarity of D720(LED)
Is it reverse polarity ?
Yes
D720 (LED) NG
No
Check +5V voltage at CN392 pin4?
Yes
No
Check if FFC broken or disconnected from CN701
Yes
Reconnect FFC. If symptoms do not improve,
FFC NG
R720 NG
Check pattern around D720(LED),
If symptoms do not improve, FR board NG
BDP-S1200/BX120/S3200/BX320/S4200/S5200/BX520
No
Is there a voltage of about +5V at emitter Q301
Yes
No
Is there a voltage about
FR Board NG.
+3.3V at base Q301?
Yes
Transistor Q301 NG
6-8
Check Power flowchart
Check IC101 P187