PDP-434PU
68
1
2
3
4
1
2
3
4
C
D
F
A
B
E
7.1.9 TROUBLESHOOTING
Symptom
Defective Assy
Possible Cause
Check Point
Possible
Defective Part
Remarks
No power (both red and green LEDs unlit)
Cable disconnection
CN4001
Check if the connection between the POWER SUPPLY and PANEL
IF assemblies is properly made.
No power (green LED not lit)
Defective 114-pin FPC
CN4004 - CN5001
ADY1081
Check if the FPC is broken or not securely inserted.
No power (both red and green LEDs lit)
Detection by the TRAP switch
CN4006
Check if the TRAP switch is properly set.
(See "7.1.4 Canceling detection of the TRAP switch".)
Defective TRAP switch
ASG1089
Check if the unit works properly when detection of the TRAP switch
is canceled. (See "7.1.4 Canceling detection of the TRAP switch.")
The power is (sometimes) interrupted.
Defective system cables
CN4002, CN4003
Check if the system cables are securely connected. (See "7.1.5
Operation when the Media Receiver is not connected.")
The power is interrupted, and the red and
green warning indications appear on the
screen.
System cables not connected
Check connection of the system cables. (See "7.1.5 Operation
when the Media Receiver is not connected.")
Key input not effective
Cable disconnection
CN4801 - CN4851
ADD1225
Check if the FPCs are properly connected. Check if imparting
vibration to the unit affects key inputs. Check if a pulse is output
when the key corresponding to Pin 2 of the CN4852 is pressed.
Cable disconnection
CN4852 - CN4010
Check if the cables are disconnected or not securely connected.
Check if a pulse is output when the key corresponding to Pin 5 of
the CN4010 is pressed.
KEY CONTROL
Defective KEY SCAN IC
KEY CONTROL Assy
IC4851
Check if a pulse is output when the key corresponding to Pin 2 of
the CN4852 is pressed.
Remote control unit not effective
Cable disconnection
CN4901 - CN4010
Check if the cables are not connected or securely connected.
Check if the FPCs are properly connected.
PANEL IR
Defective infrared receiver
PANEL IR
U4901
Check if a pulse is output when the key corresponding to Pin 3 of
the CN4010 is pressed.
Abnormality in a one-eighth area of the
screen
DIGITAL VIDEO
Defective IC4
IC4 BLOCK
IC5401
Check if an abnormal area in the screen changes when the FPC
connected to the address corresponding to the abnormal area is
replaced with the one corresponding to the next address.
ADDRESS
Check that an abnormal area in the screen does not change when
the FPC connected to the address corresponding to the abnormal
area is replaced with the one corresponding to the next address.
Abnormal screen
(Data of every other dot are abnormal)
Defective 114-pin FPC
CN4004 - CN5001
ADY1081
Check if the FPC is broken or not securely inserted.
[ Diagnosis of abnormalities other than shutdown and power-down ]
