Products
powered by electricity should be serviced or repaired only by experienced
professional technicians. Any attempt to service or repair the product or
products dealt with in this service information by anyone else could result in
serious injury or death.
How to determine the defective board.
Verification
of voltages
Normally,
when there is a power problem, shutdown occurs immediately. So, to resolve a power problem, voltage
checks are necessary before shutdown.
Check
if the power comes up after disconnecting the suspected board. If power comes up after disconnecting a board, the board is
defective. “Power comes up” equals “no
shutdown”.
After
exchanging the following boards, voltage adjustment is required.
P
board, SC board, SS board,
Defective Board - A Board.
To
confirm this, unplug the TV and disconnect connectors A5, A6, and A7 from the A
board.
The
TV should turn on automatically and display a white screen.
Warning:
Disconnect AC Power prior to making any disconnection or connection.
Defective Board (Possibility)- P, D, A, SC, SS Board (P > A,
D, SC, SS)
[Always 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
TH-42PX77U
= SS23
TH-50PX75U
= SS33
TH-50PX77U
= SS33
Defective Board-D Board:
Trouble Mode-3.3V down SOS
LED Blinking codes detail
LED blinks 4 times
Defective
Board-Primarily P board or possible D board:
Trouble Mode-Power Supply SOS
Turn
the unit on. Is pin 12 of CN P25 of the
P board high before shutdown?
If
no, D board is defective.
If
yes, P board is defective.
LED
blinks 5 times (Quick Troubleshooting)
Defective
Board-D, P, C, SC, SS board or Panel (DDIC)*1: Trouble Mode-5V SOS
(*1)
= Data Driver IC
LED blinks 5 times
LED
blinks 5 times-D, P, C, SC, SS board or Panel:
Trouble Mode-5V SOS
How
to find defective board.
LED blinks 6 times- Defective Board (Possibility)- SC, SS, D, P
Board (SC > SS, D, P )
Trouble
Mode-SC Energy Recovery SOS
How
to find defective board.
LED blinks 6 times-Defective Board (Possibility)- SC, SS, D, P
Board (SC > SS, D, P ): Trouble
Mode-SC Energy Recovery SOS
LED blinks 7 times-Defective Board (possibility): Trouble Mode-SC Floating voltage SOS
How
to find the defective board.
LED blinks 8 times-Defective Board (possibility): SS, SC, D, P board (SS>SC,D,P)/PDP:
Trouble Mode-SS Energy recovery SOS/Panel
LED blinks 10 times before pressing the power button-Defective
Board-P, A Board: Trouble Mode-SUB 5V
SOS, Main 3.3V SOS DTV 9V SOS, Tuner Power SOS
How
to find the defective board.
LED blinks 12 times-Defective Board (Possibility)- Speakers, A
Board: Trouble Mode-Sound SOS
No Power/Dead Unit-troubleshooting
No Picture from one or all inputs (OSD and Sound OK)- All models
No Picture / No OSD-All Models
No Sound
There are two kinds of picture problem. 1) Abnormal picture. 2) No picture.
Basic
concept of determining the defective board.
1)
Which area is the symptom displayed on the screen?
A.
Part of the screen
B.
All over the screen
Adjustment after PCB exchange.
After
exchanging the following boards, voltage adjustment is required. P board, SC
board, SS board.
Diagnosis
by Test Pattern When OSD is Available.
Picture problem such as “Picture Noise and or Vertical Line” displayed all over the screen is mainly caused by a defective D or A board. The “internal Test Pattern Generator” can help determine whether to replace the D or A board. The test patterns are created by the D board. Follow the steps below to confirm the operation of the D or A boards.
Diagnosis by Removing the A5 Connector.
Symptom
such as “No picture, No OSD, Sound OK” is mainly caused by a defective A or D
board. The internal pattern generator cannot be accessed due to the loss of
OSD. This method makes it possible to determine whether the A board or the D
(SC,SS) is defective.
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