LED blinks 12 times (TH42/50/58PX600U)
<Trouble Mode and Defective Board>
Trouble Mode
Sound SOS
Defective Board (Possibility)
Fan, PA Board
<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.
Does the power
LED blink 12
times?
Check the right speakers.
Yes
Disconnect the connector PA2 of
the PA board and turn the unit on.
Check
the left
speakers.
Yes
No
Does the
power LED blink 12
times?
Disconnect connector DG3 of the DG
board and plug the TV into the AC line and
observe the SC and SS board LEDs.
Do the AC
relays click and
remain on? Are the
SC and SS board
LEDs on?
No
No
Connect CN DG3 and PA5.
Disconnect CN SC2(*1),
SC23 and SC20 of the SC
board. Turn the unit on.
Does the power
LED blink 12
times?
SC Board
Yes
No
SS Board
No
Do pins 1
and 2 of CN P25
output 15V before
the unit shuts
down?
P Board
Yes
No
D Board
Yes
Warning:
Disconnect AC
Power prior to
making any
disconnection
or connection.
(*1) = See (*1) of
the previous page.
(*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
(*2) = Remove the jumper
at CN SS34 and install it
across pin 8 and 10 of
connector P12.
Yes
29
PA Board
Is the
voltage at
pin 35 of
CN PA20
High?
Yes
No
DG
Board
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 Power
Wait for approx. 30 seconds after applying AC to the unit,
then push the power button.
Yes
No
Warning: Disconnect AC Power prior to
making any disconnection or
connection.
30
Do the AC
relays click after plugging the TV
into the AC line?
Is there 5V
at pin 1 of CN PA40 on the PA
board or pin 1 of
CN HC22?
Do the AC relays click?
Is there 3.3V
at pin 1 of CN HC01 on the
HC board?
Replace the P board.
YesNo
Yes
Is there 2.5V
at pin 17 of CN P25 on the
P board?
Replace the D board.
No
Yes
Replace the
P board.
Is there 2.5V
at pin 13 of CN P25 on the P
board?
Yes
No
Replace the
P board.
No
Unplug
the TV and disconnect
CN H2. Plug the TV into
the AC outlet. Do the
relays click?
Yes
Unplug
the TV and connect
CN H2. Disconnect
CN H51. Plug the TV into
the AC outlet. Do the
relays click?
Replace the DG board.
No
No
No
Replace the
H board.
If connections between the H, K, G, and GK boards are OK, replace the K and GK boards.
Yes
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