Flowchart Of Failure Analysis For The Digital Assy - Pioneer PDP-5000EX Service Manual

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5.1.4 FLOWCHART OF FAILURE ANALYSIS FOR THE DIGITAL ASSY

Flowchart of Failure Analysis for The DIGITAL Assy
Failure analysis for the
DIGITAL Assy ⇒ DG1
The on-screen display (OSD) is
not properly indicated.
Is the LVDS cable firmly
connected?
Yes
Is the LVDS cable broken?
Yes
Is the LVDS connector poorly
contacted?
Yes
Is the voltage at pin 1 of IC3003
on the DIGITAL Assy 2.5 V?
Yes
Is V sync/H existence judgment
detected by issuing the QSI
command?
Yes
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.)
Replace the DIGITAL Assy.
5
6
• 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.
Be careful, because the LVDS cable is easily disconnected.
No
Replace the LVDS cable.
In a case of D1/D2
No
Replace the DIGITAL Assy.
In a case of M3/M4
Replace the MAIN Assy.
No
Replace the DIGITAL Assy.
2.5 V regulator output is in failure.
No
Is the sync signal properly output
from the MAIN Assy?
Yes
6
7
No
Replace the MAIN Assy.
PDP-5000EX
7
8
A
B
C
D
E
F
75
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