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TX-42AR400

11

1. Subject

Information of LED Flashing timing chart.

2. Contents

When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, the
defective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:

1. BL_SOS 

Detection beginning after one second pass from ‘BL_ON’=ON

2. TV_SOS

Detection beginning after one second pass from ‘AMP_SHUTDOWN’=ON

3. SOUND_SOS

Detection beginning ‘AMP_SHUTDOWN’=ON

Priority

Name

Factor

R_LED Blink

1

BL_SOS

SOS from PANEL inverter

1

2

TV_SOS

TCON power down

3

3

SOUND_SOS

SOS from audio AMP

9

TX-42AR400

12

To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.
How to Enter:

While pressing [VOLUME ( - )] button of the main unit, press [OPTION] button of the remote control three times within 2
seconds.
How to Exit:

Disconnect AC plug from wall outlet.
How to confirm:

If the abnormal picture is displayed, go into LCD Panel test mode to display the several test patterns.
And then, judge by the following method.
Still abnormal picture is displayed: The cause must be in LCD Panel.
Normal picture is displayed: The cause must be in A board.
Remarks:

The test pattern is created by the circuit in LCD Panel.
In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal.
If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.

First check point
There are following 2 states of No Power indication by power LED.

1. No lit
2. Red is lit then turns red blinking a few seconds later. (See 6.2.)

TX-42AR400

13

1. Fix speaker bracket at panel and screw.
2. Stick sponge at speaker and slot at speaker bracket.

01

2

PC

SPEAKER UNIT

02

4

PC

SCREW (A3/P5/VESA4/MTL4/LBRD4/SP4)

06 ± 1 Kgf.cm

03

4

PC

SP BRACKET

04

4

PC

SP. SPONGE

TX-42AR400

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1. Place down the cabinet as shown below.
2. Fix LCD panel into the cabinet by taking below precautions.

1. Do not press panel surface to avoid blue spot on the panel display.
2. Do not use hard cloth or rub the surface too hard. This may cause scratches on the surface.
3. Take care not to subject the TV’s surface to water or detergent. Any liquid (including pets urine) if enters the product could

lead to TV failure.

4. Take care not to subject the surface to insect repellent, solvent, thiner or other voiltile substances. This may degrade surface

quality or cause peeling of the paint.

5. The surface of the display panel is specially treated and may be easily damaged. Take care not to tap or scratch with your

fingernail or other hard objects.