Led Blinks 5 Times - Panasonic TH-42PX75U Technical Manual

<Trouble Mode and Defective Board>
Trouble Mode
5V SOS
<How to find the defective boards>
Yes
Disconnect
CN SC20 on the SC board. Turn
on the unit. Does the power LED
stay on?
SC Board
Connect SS23 (*1).
Disconnect CN D31and D32
on the D board. Is pin 5of CN P25
shorted
to GND?
Yes
Disconnect
Yes
CN P25. Is pin 5 of the
socket P25 shorted
to GND?
P Board
Note: CN = Connector

LED blinks 5 times

Defective Board
D, P, C, SC, SS board or Panel
No
CN SS23 (*1) on the SS board.
Turn on the unit. Does the power
Connect D31
No
and leave D32 disconnected.
Is pin 5 of CN P25 shorted
Disconnect CB1-CB4.
No
Is pin 5 of CN P25 shorted
D Board
Warning: Disconnect AC Power prior to
Connect
CN SC20. Disconnect
LED
Stay on?
Yes
SS Board
No
to GND?
Yes
No
to GND?
Yes
C1 Board Panel
12
making any disconnection or
connection.
(*1) = The reference number of
the sustain data connector is
different in some of the models:
No
TH-42PX75U = SS23
TH-42PX77U = SS23
TH-50PX75U = SS33
TH-50PX77U = SS33
Disconnect D31.
Connect D32.
Is pin 5 CN P25 shorted
to GND?
Yes
Disconnect CB5-CB8.
Is pin 5 of CN P25 shorted
to GND?
Yes
C2 Board
No
P Board
No
Panel