Pioneer PDP-5000EX, Service Manual

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PDP-5000EX
75
5 6 7 8
5 6
7
8
C
D
F
A
B
E
5.1.4 FLOWCHART OF FAILURE ANALYSIS FOR THE DIGITAL ASSY
Flowchart of Failure Analysis for The DIGITAL Assy
Is V sync/H existence judgment
detected by issuing the QSI
command? Is the sync signal properly output
from the MAIN Assy?
Is the LVDS cable firmly
connected?
Be careful, because the LVDS cable is easily disconnected.
• If the OSD is not properly displayed although the panel mask is properly displayed,
a failure exists in the path from the output of the MAIN Assy to IC3101 on the DIGITAL Assy.
→
If only the OSD is abnormal, the MAIN Assy is in failure.
• Abnormality in display location: It is most likely that the sync signal is abnormal
or that the routes for either the left or right part of the screen are in failure.
• Abnormality in tone expression: It is most likely that the video signal data are missing.
No
Firmly connect the LVDS cable.
No
Is the LVDS cable broken? Replace the LVDS cable.
No
In a case of D1/D2
In a case of M3/M4
If there is no V sync/H existence, it is most
likely that the output from the DIGITAL Assy
is in free run and that the screen only
displayes reset lighting.
(It can be judged that the DRIVE, POWER
SUPPLY Unit and the panel are normal.)
Is the LVDS connector poorly
contacted?
Is the voltage at pin 1 of IC3003
on the DIGITAL Assy 2.5 V?
Replace the DIGITAL Assy.
Replace the DIGITAL Assy.
Replace the MAIN Assy.
Replace the MAIN Assy.
No
Replace the DIGITAL Assy.
No
No
Yes
Yes
Yes
Yes
Yes
Yes
The on-screen display (OSD) is
not properly indicated.
Failure analysis for the
DIGITAL Assy
⇒
DG1
2.5 V regulator output is in failure.