Hitachi 32LD7200, Service Manual

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34
32LD7200 (PW2L)
No(low)
No
Yes
Pow
[ Power ]
er 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[2]pin of Power
supply unit high?
AC
inlet
Power
switch
Are the
voltages applied to
P803 [1][2][5], P804[1],P807[4]
and P808 [1][4][8][12]pins
of Power supply
unit?
[1][2] 6V
[5] 33V
[1] 5V
[4~7] 12V P803
P804
P804 [2]
Power on
P807
P805 [1][4][5] 5V
[8][9] 12V
[12][13] 10V
Joint or Formatter PWB
Power supply
unit
No
No
Yes
Yes
Joint or Formatter PWB
Sub power board
Power
supply unit
Yes(high)
Sub
Power board
Is the voltage
applied to CN6[1] of Power
supply unit?
Yes
[1] 3.3V
[2] 5V
[6][7] 12V
Yes
Yes
Yes
Speaker
Picture is displayed. But no sound
Are the voltages
applied to PAJ1[1][2][6][7]
of the Audio PWB?
Are the signals
applied to PAF1[2][4]
of the Audio PWB?
No
Audio PWB [2] L ch
[4] R ch
No
Are there signals
on Speaker Terminals?
Audio PWB
No
Formatter PWB or
Video PWB
Check
Speaker terminal and
Speaker cord.
Unlocked
Check
Locked
No sound
Are the voltage
applied to PJA1[1][2][6][7]?
Joint PWB
No