Pioneer KURO PDP-LX508D, Service Manual

Page: 59 / 175

PDP-LX5080D
59
5 6 7 8
5 6
7
8
C
D
F
A
B
E
Is the function corresponding to
selected signal input selected? Select the corresponding signal
with the input selector.
No
Check around the input terminal (CN4701).
If there was no ploblem, replace the MAIN Assy.
No
Check the circuit between IC4701 and IC5001.
If there was no ploblem, replace the MAIN Assy.
No
Check around IC4701 and check the communications
between IC4701 and the microcomputer.
If there was no ploblem, replace the MAIN Assy.
No
Check around the IC that is found to have a failure
in communication and the microcomputer.
If there was no ploblem, replace the MAIN Assy.
No
Replace the MAIN Assy.
Yes
Yes
Image for the PC signal is not
displayed.
=> COMP/PC2
Has the signal arrived at IC4701
(RGBSW)? (pins 61, 62, 64, 66,
68)
Yes
Which signal is not output,
main or sub signal?
Is a signal output from IC4701?
(pins 20, 22, 24)
Has the signal arrived at IC5001
(ADC)?
(pins 43, 48, 54)
Yes
Yes
Is the communication between
each IC (ADC, ASIC) on the MAIN
Assy and the microcomputer
nomal?
Yes
Yes
Sub
Main
35 34 33 32 31
38 37 36
41 40 39
31
IC4701 - pin 61
V: 1 V/div H: 2 mS/div
32
IC4701 - pin 62
V: 1 V/div H: 10
μ
S/div
36
IC4701 - pin 20
V: 500 mV/div H: 10
μ
S/div
41
IC5001 - pin 54
V: 500 mV/div H: 10
μ
S/div
37
IC4701 - pin 22
V: 500 mV/div H: 10
μ
S/div
Waveforms
Input signal: Color-bar (PC XGA/60 Hz)
33
IC4701 - pin 64
V: 500 mV/div H: 10
μ
S/div
38
IC4701 - pin 24
V: 500 mV/div H: 10
μ
S/div
34
39
IC4701 - pin 66
V: 500 mV/div H: 10
μ
S/div
IC5001 - pin 43
V: 500 mV/div H: 10
μ
S/div
40
IC5001 - pin 48
V: 500 mV/div H: 10
μ
S/div
35
IC4701 - pin 68
V: 500 mV/div H: 10
μ
S/div
Flowchart of Failure Analysis for The Video System
Is the screen of main side
Analog/Digital TV?
No
Specifications that does not
display in the sub-side.