Pioneer PDP-5020FD Service Manual page 50

1
A
A
Is there any local abnormality
on the screen?
No
In the subsequent diagnostic steps, it is most likely that the multi base section is in failure.
Problems concerning video display
B
Is the panel mask properly
displayed?
Yes
• Check with the combination of the animated/slanting ramp or other mask patterns and mirror function.
* Animated pattern: For checking erroneously discharged cells, load change is constantly caused on a screen.
* Ramp pattern: For checking gradation expression
* Mirror function: For checking if a defective indication is interlocked with mirror inversion, in order to identify a defective point
Is the on-screen display (OSD)
properly displayed?
Yes
Check on the Factory menu.
C
Is an external video signal
displayed properly?
Yes
Problems concerning the audio output
Is the audio signal output?
Yes
D
Specific failure whose cause is
difficult to identify in the initial stage
E
F
50
1
2
Yes
Is the abnormality associated
with one ADDRESS or one TCP?
Yes
Failure analysis for the
drive system => DR3
Failure analysis for the
No
drive system => DR2
No
Failure analysis for the
DIGITAL Assy => DG1
No
Failure analysis for the
MAIN Assy => MA3
No Failure analysis for the
audio system => AU1
PDP-5020FD
2
3
No Is the abnormality associated
with one scan IC block?
Yes
Failure analysis for the
drive system => DR4
3
4
No
Replace the panel chassis.
4