Panasonic TH-42PX75U - TV Usage and Features; Watching TV Channels

LED blinks 12 times
<Trouble Mode and Defective Board>
Trouble Mode
Sound SOS
Defective Board (Possibility)
Speakers, A Board
<How to find the defective boards>
Disconnect the connectors A5, A6,
and A7 on the P board.
Check the speakers.
Yes
No
Does the
TV turn on by itself
with a white screen.
Reconnect CN A5, A6, and
A7. Disconnect CN SC2(*1),
and SC20 of the SC board.
Turn the unit on.
Does the power
LED stay on?
SC Board
Yes
No
Disconnect CN SS11(*1),
SS12 (*2) and SS23 (*3)
of the SS board. Turn the
unit on.
Does
the power LED stay
on?
SS Board
No
Do pins 1
and 2 of CN P25
output 15V before
the unit shuts
down?
P Board
No
D Board
Yes
Warning: Disconnect AC Power
prior to making any disconnection
or connection.
20
(*1) = To avoid potential shock from the VSUS voltage, discharge the
connectors SC2 or SS11 before reconnecting them into their respective socket.
(*3) = The reference number of the sustain
data connector is different in some of the
models:
TH-42PX75U = SS23
TH-42PX77U = SS23
TH-50PX75U = SS33
TH-50PX77U = SS33
(*2) = Remove the jumper at CN SS34 and
install it across pin 8 and 10 of connector P12.
A Board
Yes
No
Reconnect A5, A6, and
A7 and disconnect the
speakers. Turn the power
on. Does the TV stay on?
Yes