Led Blinks 2 Times - Panasonic TH-42PX75U Technical Manual

<Trouble Mode and Defective Board>
Trouble Mode
15V down SOS
<How to find the defective boards>
Unplug the TV, reconnect CN A5, A6, and A7 and
disconnect CN SC20 and SC2. To isolate the SC
board.
Turn the unit on.
Does the power LED
Unplug the TV, reconnect SC20 and SC2 and disconnect CN P12,
SS11, and SS23 (*1) to isolate the SS board. Remove the jumper at
CN SS34 and install it across pin 8 and 10 of connector P12.
Does the power LED
Note: CN = Connector

LED blinks 2 times

Defective Board (Possibility)
P, D, A, SC, SS Board (P > A, D, SC, SS)
No
Yes
stay on?
No
Turn the unit on. Yes
stay on?
No
Disconnect CN A5, A6,
and A7 on the A board. Does
the TV turn on by itself with
a white screen?
SC Board
Reconnect CN P12, SS11,
And SS23 (*1). Turn the unit on.
Is there 15V output at
SS Board
8
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
(*1) = The reference number of
the sustain data connector is
different in some of the models:
TH-42PX75U = SS23
Yes
TH-42PX77U = SS23
TH-50PX75U = SS33
TH-50PX77U = SS33
A Board
Unplug the TV,
No
CN P25 pin 1 or 2
before the TV
shuts down ?
Disconnect CN P25. Is pin 1
or 2 of the CN P25 shorted to
Yes
D Board
D Board
Unplug the TV. No
GND?
Yes
P Board