PDP-425CMX
126
1234
1234
C
D
F
A
B
E
• Diagnosis of the shutdown
Frequency of Flash-
ing of Green LED
Shutdown Operation Defective Assy Reason for Shutdown Point to be Checked
Possible
Defective Part
Remarks
1
Communication failure in panel
drive IC
DIGITAL Failure in panel drive IC or defective peripheral circuits
SQ ASIC BLOCK, PANEL FLASH BLOCK
IC3401,IC3151
DIGITAL Writing failure of panel drive IC
IC3401,IC3151
After turning the unit on again, check if the data on the version can be
read with the QS1 command.
2
IIC communication failure of the
module (Check the shutdown
subcategory on the Factory
menu.)
DIGITAL
Communication failure in EEPROM (4k) or defective peripheral circuits
MODULE UCOM BLOCK IC3156
DIGITAL Failure in the DAC IC or defective peripheral circuits MODULE UCOM BLOCK IC3157
DIGITAL
Communication failure in EEPROM (2k) or defective peripheral circuits
OB AUDIO IC3161
DIGITAL Failure in Temp Sensor IC or defective peripheral circuits OB AUDIO IC3158
3 Abnormality in RST2
DIGITAL Defective DC-DC converter DIGITAL DD CON BLOCK U3601, IC3401
Check if 3.3V and 1.2V are activated. (not short-circuited) No 8-V power input
to the DC/DC converter. A defective IC3401 may be the cause.
DIGITAL Failure in the RST IC PANEL FLASH BLOCK IC3302,IC3304
POWER SUPPLY 12V power not booted POWER SUPPLY
4 Panel having higher temperature
PANEL SENSOR Failure in thermister or defective peripheral circuits Temperature sensor
IC3158,IC3151
If this pattern of flashing occurs even when the panel temperature has not clearly reached the
specified one, possible causes are a defective IC3158 temperature sensor, defective soldering
of IC3158, broken TEMP1 signal line, and defective soldering between IC3158 and IC3151.
Panel having higher temperature Surrounding temperature
Sensor temperature 75ºC (TEMP1)
5 Audio failure
Speaker short-circuited Speaker terminals
Check if the speaker cables are in contact with the chassis, etc.
AUDIO Defective AMP IC IC3002
AUDIO Defective AUDIO CONTROL IC IC3001
MAIN Defective buffer IC5306
AUDIO Disconnection of connector CN9001-CN3004
Check if the connector is disconnected or not securely connected.
6
Communication failure in module
microcomputer
DIGITAL
Communication failure of the module microcomputer or defective peripheral circuits
MODULE UCOM BLOCK IC3151
Check if the communication lines (TXD0/RXD0) are shorted or opened.
Failure in writing in the module microcomputer MODULE UCOM BLOCK IC3151
Disconnection of connector CN9001-CN8502
Check if the connector is disconnected or not securely connected.
7 Not used
8 IIC communication failure
MAIN Communication failure of EEPROM IC9508
VIDEO SLOT 1 or 2 Communication failure of VIDEO SLOT IC1 (CVBS) IC1 (Y/C) BLOCK IC6255
VIDEO SLOT 1 or 2 Communication failure of VIDEO SLOT IC1 (Y/C) IC1 (CVBS) BLOCK IC6107
MAIN Communication failure of A/D Main (A system) IC6501
MAIN Communication failure of A/D Sub (Bsystem) IC6701
MAIN Communication failure of IC6 IC6301
VIDEO SLOT 1 or 2 Communication failure of VIDEO SLOT EEPROM IC6257
AUDIO Communication failure of AUDIO CONTROL IC IC3001
MAIN Communication failure of extension I/O2 IC5304
9 Not used
10 Fan failure
FAN Failure in the fan motor or fan stopped by attached dust.
Disconnection of connector
CN9003, CN9004, FAN wires (FA,FB) relay part
Check if the connector is disconnected or not securely connected.
11 Unit having higher temperature
SENB, SENC, SEND Use in high temperature environment Surrounding temperature Sensor temperature is a high temperature
SENB, SENC, SEND Defective the sensor IC Temperature sensor
IC1001, IC1101, IC1201
Disconnection of connector
CN1001, CN1101, CN1201, CN9501, wires
Check if the connector is disconnected or not securely connected.
12 Not used
13
Failure of the power supply voltage
POWER SUPPLY Power failure
Pins 1 to 3 of PN1
POWER SUPPLY
Check if 3.3V is activated. (not short-circuited)
14 Not used
15 Others
Failure of 12V line circuit Check the short-circuit point of 12V line circuit.
Failure of 13.5V and 6.5V line circuits
Check the short-circuit points of 13.5V and 6.5V line circuits.
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