Pioneer PDP-427CMX - Page 33

PDP-427CMX
33
5678
56
7
8
C
D
F
A
B
E
In a case when no image from any input appears
Examination of the MAIN board
Failure in the power supply
unit, or PN1 cable broken
NO
YES
YES
YES
NO
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?
YES
YES
Is the voltage at Pin 51 of
IC8501 3.3 V DC?
Disconnect the cable from the
PN1 connector. Check if 3.3V
DC is output from Pin 1 of PN1.
Disconnect the cable from the
PN2 connector. Check if 2.5V
DC is output from Pin 1 of PN2.
Failure in the power supply
unit, or PN2 cable broken
NO
NO
NO
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?
Failure in the MAIN PWB
Failure in the MAIN PWB
Failure in the MAIN PWB
YES
NO
YES
Is the voltage at Pin 5 of
IC8003 1.5 V DC?
NO
YES
Is a CLK signal input to Pin 3
of X8001?
Is a CLK signal input to Pin 3
of X8002?
NO
YES
YES
Failure in the IC8501
NO
• Reset discharge is occurred.
• Mask is displayed.
• DSD is not displayed.
Diagnosis of Panel Module
Failure in the IC8002
Failure in the IC8003
Failure in the X8001
Failure in the X8002
Waveform 33
Waveform 34
Waveform 35