Pioneer PDP-425CMX Service Manual page 147

5
In a case when no image from any input appears
• Reset discharge is occurred.
• Mask is displayed.
• DSD is not displayed.
YES
Examination of the MAIN board
YES
Is the voltage at Pin 51 of
IC8501 3.3 V DC?
Waveform 33
YES
Is a CLK signal input to Pin 12 of
IC8501? And are sync signals
input to Pins 55 and 57?
Is a DE signal input to Pin 58?
NO
Is the voltage at Pin 1 of PN2
connector 2.5 V DC?
YES
Is the voltage at Pin 4 of
IC8002 1.5 V DC?
YES
Is the voltage at Pin 5 of
IC8003 1.5 V DC?
Waveform 34
YES
Is a CLK signal input to Pin 3
of X8001?
Waveform 35
YES
Is a CLK signal input to Pin 3
of X8002?
YES
Failure in the MAIN PWB
5
6
NO
Diagnosis of Panel Module
NO
Disconnect the cable from the
PN1 connector. Check if 3.3V
DC is output from Pin 1 of PN1.
YES
Failure in the MAIN PWB
YES
Failure in the IC8501
NO
Disconnect the cable from the
PN2 connector. Check if 2.5V
DC is output from Pin 1 of PN2.
YES
Failure in the MAIN PWB
NO
Failure in the IC8002
NO
Failure in the IC8003
NO
Failure in the X8001
NO
Failure in the X8002
PDP-425CMX
6
7
NO
Failure in the power supply
unit, or PN1 cable broken
NO
Failure in the power supply
unit, or PN2 cable broken
7
8
A
B
C
D
E
F
147
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