Pioneer PDP-507XC Service Manual page 16

1
Flowchart of Failure Analysis for The Video-system Assy
A
No video from component or pc
COMPONENT Image for the component signal
is not displayed.
YES
Is any function which inputs signal
selected with the input selector?
YES
Has the signal arrived at IC4901?
(78)(80)(82)(86)(88)(90)
YES
Which signal is not output, main
or sub signal?
MAIN
B
Is a signal output from IC4901?
(41)(43)(45)
YES
Has the signal arrived at IC5301?
(43)(48)(54)
YES
Is the communication between each IC (VDEC,
ASIC) on the MAIN Assy and the microcompute
normal?
YES
Has the symptom been settled when the
MAIN Ass'y is replaced?
YES
C
Replace the MAIN Assy.
PC Image for the PC signal is not
displayed.
YES
Is any function which inputs signal
selected with the input selector?
YES
Has the signal arrived at IC4901?
(61)(62)(64)(66)(68)
YES
Which signal is not output, main
or sub signal?
D
MAIN
Is a signal output from IC4901?
(41)(43)(45)
YES
Has the signal arrived at IC5301?
(43)(48)(54)
YES
Is the communication between each IC (VDEC,
ASIC) on the MAIN Assy and the microcomputer
normal?
YES
Has the symptom been settled when the
MAIN Ass'y is replaced?
YES
E
Replace the MAIN Assy.
F
16
1
2
NO Select a designated input with the input
selector.
NO Check the FFC between CN8801 and CN4004 or
between CN9003 and CN4005, and check around
19 20 21
the pin jack.
SUB Is the screen of main side
Analog/Digital TV?
YES
22
NO Check around IC4901 and the communication
23 24
between IC4901 and microcomputer. If there is
no problem, replace the MAIN Assy.
25
NO Check the circuit between IC4901 and IC5301.
27
26
If there is no problem, replace the MAIN Assy.
Check the IC that is found to have failure in
NO
communication and around the microcomputer.
If there is no problem, replace the MAIN Assy.
NO
The panel is defective.
NO Select a designated
input with the input selector.
NO Check the FFC between CN9301
and CN4018, and check IC4901 or
28 29 30
around the terminal.
31 32
SUB Is the screen of main side
Analog/Digital TV?
YES
33
NO Check around IC4901 and the communication
34 35
between IC4901 and microcomputer. If there is
no problem, replace the MAIN Assy.
36
NO Check the circuit between IC4901 and IC5301.
38
37
If there is no problem, replace the MAIN Assy.
Check the IC that is found to have failure in
NO
communication and around the microcomputer.
If there is no problem, replace the MAIN Assy.
NO
The panel is defective.
2
3
NG
Replace the FFC.
NO It is specified that the
image is not displayed
in the sub side.
NG
Replace the FFC.
NO It is specified that the
image is not displayed
in the sub side.
PDP-507XC
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4
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