Hitachi 28LD5200E Service Manual page 20

Power cannot be turned on (LED does not light)
Is the input voltage
applied to Power supply unit?
P804 [1][8]pins, P806[1]pin
and P808 [1][4][8][12]pins
Joint / Formatter PWB
Picture is displayed. But no sound
Speaker terminal and
applied to EAJ1[1][5]pins
of the Audio PWB?
applied to EAF1[1][3]pins
of the Audio PWB?
on Speaker Terminals?
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(CN5 [1][3])
Yes
Are the
voltages applied to
of Power supply
P804
unit?
Yes
P806
Check
Speaker cord.
Locked
No sound
Are the voltages
[1] +5V
Yes
[5] +12V
[3] GND
Are the signals
[1] L ch
Yes
[3] R ch
[2] GND
Are there signals
Yes
Speaker
28LD5200E (PW1L)
No
AC
Power
switch
inlet
No
[1] +5V P808 [1] +30V
[8] +6V [4] +5V
[8] +12V
[12] +10V
[1] +12V
Is the voltage
applied to P804[3]pin of Power
supply unit high?
No(low)
P804 [3]
Power GO
Unlocked
Yes(high)
Check
Joint / Formatter PWB
No
No
Formatter PWB or
Video PWB
No
Audio PWB
20
Power supply
Power board
unit
Yes(high)
Is the voltage
applied to P804[5]pin of Power
supply unit high?
No(low)
P804 [5]
Power OFF
Power
supply unit
Are the voltage
applied to EAJ1[1][5]pins?
(When EAJ1 is
disconnected.)
Yes
Audio PWB
Sub
No
Power supply
unit