Led Blinks 12 Times (Th42/50/58Px600U) - Panasonic TH-37PX60U Technical Manual

LED blinks 12 times (TH42/50/58PX600U)

<Trouble Mode and Defective Board>
Trouble Mode
Sound SOS
<How to find the defective boards>
Make sure that the connector P5 on the P board and connector PA5 on
the PB board are seated properly.
Disconnect the connector PA1 of
the PA board and apply power.
Yes
Does the power
LED blink 12
times?
No
Check the right speakers.
Do the AC Is the
Yes
voltage at
relays click and
pin 35 of
remain on? Are the
CN PA20
SC and SS board
High?
LEDs on?
Yes
No
PA Board
No Power
No
Yes
Is there 5V
at pin 1 of CN PA40 on the PA
board or pin 1 of
CN HC22?
Is there 2.5V
Yes
at pin 13 of CN P25 on the P
board?
Replace the
P board.
Yes
Unplug
the TV and connect
No
CN H2. Disconnect
CN H51. Plug the TV into
the AC outlet. Do the
Replace the
relays click?
H board.
Defective Board (Possibility)
Fan, PA Board
Disconnect the connector PA2 of
the PA board and turn the unit on.
No
Does the
power LED blink 12
times?
Yes
Disconnect connector DG3 of the DG
board and plug the TV into the AC line and
observe the SC and SS board LEDs.
Connect CN DG3 and PA5.
Disconnect CN SC2(*1),
SC23 and SC20 of the SC
No
board. Turn the unit on.
DG
Board
Does the power
LED blink 12
times?
SC Board
29
Do the AC
relays click after plugging the TV
into the AC line?
No
Replace the
P board.
No
at pin 1 of CN HC01 on the
Unplug
the TV and disconnect
No
CN H2. Plug the TV into
the AC outlet. Do the
relays click?
Replace the DG board.
Yes
If connections between the H, K, G, and GK boards are OK, replace the K and GK boards.
30
Warning:
Disconnect AC
Power prior to
making any
disconnection
or connection.
Check
the left
speakers.
Disconnect
CN SS11(*1), SS12 (*2)
and SS23 (*3) of the SS
board. Turn the unit on.
Does the power LED
blink 12
times?
No
Yes
No
SS Board
Warning: Disconnect AC Power prior to
making any disconnection or
Yes
Wait for approx. 30 seconds after applying AC to the unit,
then push the power button.
No
Do the AC relays click?
Yes
Is there 3.3V
HC board?
No
Is there 2.5V
at pin 17 of CN P25 on the
P board?
No
Replace the D board.
(*1) = See (*1) of
the previous page.
(*2) = Remove the jumper
at CN SS34 and install it
across pin 8 and 10 of
connector P12.
(*3) = The reference
number of the sustain
data connector is
different in some of the
models:
TH-42PX600U = SS23
TH-50PX600U = SS44
TH-58PX600U = SS44
Yes
Yes
Do pins 1
and 2 of CN P25
output 15V before
the unit shuts
down?
No
P Board D Board
connection.
Yes
Replace the P board.