Led Blinks 7 Times - Panasonic TH-42PX75U Technical Manual

<Trouble Mode and Defective Board>
Trouble Mode
SC Floating voltage SOS
<How to find the defective boards>
Make sure the connectors P2/SC2, SC20/D20 are not loose and seated properly.
Disconnect
the connectors SC2,
and SC20 from the SC
board. Turn the TV on.
Does the TV power up
and
stay on?
Yes
Connect
the connectors SC2(*2),
and SC20 to the SC board.
Remove the SU board.
Turn the TV on. Does the
TV power up
and stay on?
Yes
SU Board
Note: CN = Connector

LED blinks 7 times

Defective Board (possibility)
SC, SU, SD, P board (SC,SU,SD>D,P)
Turn the TV on.
Does 15Vdc appear
No
at pin 1 of CN P25 on the
P board before the unit
shuts down?
Yes
Install
No
the SU board and
Remove the SD board.
Turn the TV on. Does
it power up
and stay on?
Yes
SD Board
Warning: Disconnect AC Power prior to
No
P Board
voltage appear at pin 1 of
No
SC Board.
NOTE: If the SC board
does not fix the
problem, replace the D
board.
15
making any disconnection or
connection.
Turn the TV on.
Does VSUS(*1)
No
CN P2 of the P board
before shutdown?
Yes
SS Board
(*1) VSUS about 180V
(Accurate voltage is
provided on the Panel
Label)
(*2) CAUTION:
Before connecting
P2/SC2 or P11/SS11,
discharge is necessary
to prevent potential
shock caused by
VSUS.
P Board