PDP-507CMX
120
1234
1234
C
D
F
A
B
E
5.3.2 SHUT DOWN OF FAILURE ANALYSIS
Frequency of
LED Flashing
Major Type Detailed Type
Log Indication in Factory Mode
Checkpoint
Possible Defective
Part
Remarks
MAIN SUB
1
Abnormality in the
Sequence Processor
Communication error
SQ-IC
RTRY CLK_SQ/TXD_SQ, etc. IC3151, IC3401 SQ_IC communication not established
Drive stop SQNO Check if the video sync signal is input to IC3401. CN3001, IC3401
If the signal detection by the module microcomputer is properly performed, the unit operates on an external sync.
Busy BUSY BUSY_SQ IC3401 If BUSY_SQ remains high, a shutdown is generated.
Incoherent version (hardware, software)
VER-HS
Check the model number of the DIGITAL Assy and the destination of the SEQ-
IC3301, IC3401 The written SQ_PROG is incoherent with data on the DIGITAL Assy.
2
Failure in IIC
communication with the
module microcomputer
DIGITAL Assy EEPROM
MD-IIC
EEPROM IIC communication line of IC3156 IC3151, IC3156
Check the pull-up resistor of the IIC control line and the power to the corresponding IC.
PANEL SENSOR EEPROM BACKUP IIC communication line of IC3652 IC3151, IC3652
Check the pull-up resistor of the IIC control line and the power to the corresponding IC.
DAC DAC IIC communication line of IC3157 IC3151, IC3157
Check the pull-up resistor of the IIC control line and the power to the corresponding IC.
3
Abnormality in RST2
power decrease
– RST2 –
Is the output voltage of the DC-DC converter low? AXY1137
If RST2 does not become high after the unit is turned on, a shutdown will be generated in several seconds.
The 12 V power is not output. POWER SUPPLY Unit
(AXY1135)
Check if V + 12 V is started.
4
High temperature of the
panel
– TMP_NG TEMP1
Ambient temperature –
If TEMP1 that is read by the module microcomputer is 75°C or higher, a shutdown will be generated.
Abnormality in the panel temperature sensor AWW1116 (IC3901) Check the connection with the SENSOR Assy.
5
Short-circuiting of the
speakers
–––
AMP IC
IC3002
AMP IC in failure
Note: Check the connections of the speakers. A wrong usage of speakers by
customers, such as extended time of short-circuiting of the speaker outputs or
use of speakers with impedance of 6 ohms or less, may have caused a failure
in the AMP IC.
6
Failure in communication
with the module
microcomputer
–––
MODULE UCOM BLOCK
MODULE UCOM BLOCK
IC3151
Failure in communication with the module microcomputer or the defective
surrounding circuitry is suspected. Check if the communication line
(TXD0/RXD0) is short-circuited or open.
IC3151 Failure in writing in the module microcomputer
AD2 connector
–Check if cables are firmly connected.
7
Not used
–
–
–– – –
8
Failure in IIC
communication with the
main microcomputer
Temperature sensor
–
–
– Temperature sensor –
The temperature sensors do not operate properly. Check if the cables from the
three temperature sensors are properly connected.
MAIN – Failure in communication with the EEPROM
IC9508
Communication with the EEPROM that backs up the latest settings of the main
microcomputer failed. Possible causes are disconnection of the IIC line (SCL
Pin 6, SDA Pin 5), short-circuit, or defective IC.
–
VIDEO SLOT –
Failure in communication with the VIDEO SLOT IC1 (CVBS)
IC6255
Communication with the video decoder that is mounted in the video slot failed.
Possible causes are disconnection of the IIC line (SCL Pin 37, SDA Pin 36),
short-circuit, or defective IC.
–
VIDEO SLOT – Failure in communication with the VIDEO SLOT IC1 (Y/C)
IC6107
–
MAIN – Failure in communication with the A/D Main (A system)
IC6501
Communication with the A/D converter failed. Possible causes are
disconnection of the IIC line (SCL Pin 119, SDA Pin 118), short-circuit, or
defective IC.
–
MAIN – Failure in communication with the A/D Sub (B system)
IC6701
–
MAIN – Failure in communication with the IC6
IC6301
Communication with the RGB signal switch failed. Possible causes are
disconnection of the IIC line (SCL Pin 166, SDA Pin 165), short-circuit, or
defective IC.
–
VIDEO SLOT – Failure in communication with the VIDEO SLOT EEPROM
IC6257
Communication with the EEPROM that is mounted in the video slot failed.
Possible causes are disconnection of the IIC line (SCL Pin 6, SDA Pin 5),
short-circuit, or defective IC.
–
AUDIO – Failure in communication with the AUDIO CONTROL IC
IC3001
Communication with the audio control IC failed. Possible causes are disconnection
of the IIC line (SCL Pin 18, SDA Pin 17), short-circuit, or defective IC.
–
MAIN – Failure in communication with the extention I/O
IC5304
Communication with the extension I/O failed. Possible causes are disconnection
of the IIC line (SCL Pin 22, SDA Pin 23), short-circuit, or defective IC.
9
Not used
––––
–
–
10 Abnormality in the fan –
–
–
FAN
FAN or MAIN Assy
or DD Assy
The fan is in failure. First check if a foreign object is caught in the fan. Then
check if the FAN cable is properly connected.
11
Abnormality in temperature
–
––
––
The temperature of the unit or the ambient temperature may be abnormally high.
12
Not used –
–
–– – –
14
Not used –
–
–– – –
15
VCC-DOWN1 detection
VCC-DOWN2 detection
VIDEO SLOT
COMM SLOT
–
–
12 V circuit is in failure
13.5 V and 6.5 V circuits are in failure
––
13
Abnormality in the power
supply voltage
–
–
–– –
As it is very difficult to identify the defective part, replacement of the Assy or the
power unit is required.
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