TX-40CX670E, TX-40CX680E, TX-40CXR700 (serv.man2) - Panasonic TV Service Manual (repair manual). Page 20

20

1. Subject

Information of LED Flashing timing chart.

2. Contents

When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the 
defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.

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

While pressing [VOLUME ( - )] button of the main unit, press [YELLOW] button of the remote control three times within 2
 seconds.

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.

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.

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.

Blinking Times

Contents

Check point

1

BL SOS

LCD PANEL 

P-Board

LDP-Board

7

SUB 3.3V / 1.0V

P-Board
A-Board

9

SOUND SOS

A-Board
Speaker

10

NVT SOS

A-Board

13

EMERGENCY SOS

A-Board