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