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Diagnosis; Troubleshooting; Flowchart Of Failure Analysis For The Whole Unit - Pioneer PDP-4271HD Service Manual

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5

5. DIAGNOSIS

5.1 TROUBLESHOOTING

5.1.1 FLOWCHART OF FAILURE ANALYSIS FOR THE WHOLE UNIT

Flowchart of Failure Analysis for The Whole Unit
START
Problems concerning STB status
Is the STB LED lit?
Yes
Problems concerning the power
Can the unit be turned on
(Relay ON)?
Yes
A shutdown occurs.
No
A power-down occurs.
No
Problems concerning lighting of the panel
Does the screen display reset
lighting?
Yes
Is the panel arbitrary turned on or
off repeatedly? Or do luminescent
spots appear on the screen?
No
Is there any local abnormality
on the screen?
No
A
5
6
No
Is STB 3.3 V power supplied?
(Check the power at the IF micro-
computer on the MAIN Assy.)
Yes
Is the voltage at AC_DET on the
POWER SUPPLY Unit high?
Yes
Failure analysis for the
MAIN Assy. ⇒ MA1
No
Is the power shutdown?
Yes
Yes
See "Shutdown diagnosis." ⇒ SD
Yes
See "Power-down diagnosis." ⇒ PD
No
Is the drive off?
No
Failure analysis for the
drive system ⇒ DR1
Yes
Failure analysis for the
POWER SUPPLY Unit. ⇒ PS3
Failure analysis for the
drive system ⇒ DR2
Yes
Yes
Is the abnormality associated
with one address or one TCP?
Yes
Failure analysis for the
drive system ⇒ DR3
6
7
No
Check if the cable that connects
the POWER SUPPLY and MAIN
Assys is firmly connected.
The blue LED on the DIGITAL Assy indicates ON/STB
of the panel and causes for a power-down or shutdown.
If neither the blue nor red LED lights, it is likely that the
power to the STB system is not supplied. (failure, PASV-STB status)
No
Replace the POWER SUPPLY
Unit.
Is the voltage at the RELAY port
No
of the connectors between the
DIGITAL and POWER SUPPLY
Assys H (3.3 V)?
Yes
Failure analysis for the
POWER SUPPLY Unit. ⇒ PS2
A power-down will not be generated if the drive is off.
Yes
Turn the drive on.
In a case where luminescent spots appear
or the panel is repeatedly turned on or off
In a case where luminescent spots appear
No
Is the abnormality associated
with a single scan line?
Yes
Failure analysis for the
drive system ⇒ DR4
PDP-4271HD
7
8
NG
Failure analysis for the
POWER SUPPLY Unit. ⇒ PS1
No
Failure analysis for the
MAIN Assy. ⇒ MA2
If the module microcomputer does not
receive the PON command, it is likely
that the main microcomputer did not
issue the command.
• Check the DRF SW.
• Before turning the drive off with the RS-232C
commands or using the remote control unit,
turn the unit off.
No
Replace the panel chassis.
8
A
B
C
D
E
F
77

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