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Flow Chart
Power cannot be turned on (LED does not light)
Is the input voltage
applied to Power supply unit?
(CN61
, )
Yes
Are the voltages
applied to CN63
and CNPPS
of Power supply unit ?
Yes
Formatter PWB
Picture is displayed. But no sound
Check
Speaker terminal and
Speaker cord.
Locked
Are the voltages
applied to EAJ1
pins
of the Audio PWB?
Yes
Are the signals
applied to EAF1
pins
of the Audio PWB?
Yes
Are there signals
on Speaker Terminals?
Yes
Speaker
No
AC inlet
Power switch
pins
No
pins
[CN63]
+5V
[CNPPS]
+3.3V
Unlocked
Check
No sound
No
+ 5V
+12V
GND
No
L ch
R ch
Formatter PWB or
GND
Video PWB
No
Audio PWB
AC Fuse
F901 T6.3AH 250V
+30V
Power supply unit
+ 5V
+12V
+10V
Are the voltage
applied to EAJ1
pins?
(When EAJ1 is
disconnected.)
Yes
Audio PWB
55
FILTER PWB
No
Power supply
unit
PW1A
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