Pioneer KURO PDP-LX508D, Service Manual

Page: 52 / 175

PDP-LX5080D
52
1 2 3 4
1 2 3 4
C
D
F
A
B
E
5.2.4 DIGITAL ASSY
Flowchart of Failure Analysis for The DIGITAL Assy
Is V sync judgment and H exist-
ence judgment detected by issuing
the QSI command?
Is the sync signal properly output
from the MAI
N Assy?
Is the 50-pin FFC cable (J211)
firmly connected?
Firmly connect the 50-pin FFC
cable (J211).
If neither the V frequency nor H existence judgment is inappropriate, it is most likely
that the output from the DIGITAL Assy is in free run and that the screen only displays
reset lighting.
(It is judged that the drive, PO
W ER SUPPLY Unit and the panel are normal.)
W hen disconnecting the FFC cable, take care not to damage the C N 3201 connector
on the DIGITAL Assy, which can easily be damaged.
• If the OSD is not properly displayed although the panel mask is properly displayed,
a failure exists in the path from the output of IC2
8 01 on the MAI N Assy to IC3401 on the DIGITAL Assy.
-> If only the OSD is abnormal, the MAI N Assy is in failure.
In a case of D11
It is most likely that the sync signal is abnormal.
It is most likely that the video signal data are missing.
DIGITAL : D11
MAI
N : M1
In a case of M1
N o
N o
N o
N o
N o
N o
Is the 50-pin FFC cable (J211)
broken?
Is the FFC connector poorly
contacted?
Replace the 50-pin FFC cable
(J211).
N o
Replace the DIGITAL Assy.
Replace the MAI N Assy.
Replace the MAI N Assy.
Replace the MAI N Assy.
Is the indication position
correct?
Is the tone correct?
N o
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Replace the MAI N Assy.
The on-screen display (OSD) is
not properly indicated.
Failure analysis for the
DIGITAL Assy => DG1