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28LD5200E (PW1L)
Yes
[1] +5V
[5] +12V
[3] GND
Yes
Yes
Yes
Speaker
Picture is displayed. But no sound
Are the voltages
applied to EAJ1[1][5]pins
of the Audio PWB?
Are the signals
applied to EAF1[1][3]pins
of the Audio PWB?
No
No(low)
Audio PWB
[1] L ch
[3] R ch
[2] GND
No
Are there signals
on Speaker Terminals?
Audio PWB
No
Formatter PWB or
Video PWB
No
Yes
Power cannot be turned on (LED does not light)
Is the input voltage
applied to Power supply unit?
(CN5 [1][3])
Is the voltage
applied to P804[3]pin of Power
supply unit high?
AC
inlet
Power
switch
Are the
voltages applied to
P804 [1][8]pins, P806[1]pin
and P808 [1][4][8][12]pins
of Power supply
unit?
[1] +5V
[8] +6V
[1] +12V
P804
P804 [3]
Power GO
P804 [5]
Power OFF
P806
P808
[1] +30V
[4] +5V
[8] +12V
[12] +10V
Joint / Formatter PWB
Power supply
unit
No
Yes
Joint / Formatter PWB
Power
supply unit
Yes(high)
Yes(high)
Sub
Power board
Check
Speaker terminal and
Speaker cord.
Unlocked
Check
Locked
No sound
Are the voltage
applied to EAJ1[1][5]pins?
(When EAJ1 is
disconnected.)
Power supply
unit
No
No(low)
Is the voltage
applied to P804[5]pin of Power
supply unit high?
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