Panasonic TCL42U30 - 42" LCD, Руководство по обслуживанию

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6.2. Power LED Blinking timing chart
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.
6.3. LCD Panel test mode
Purpose:
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 [SUB MENU] button of the remote control t h ree 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
or TC board.
Normal picture is displayed: The cause must be in A board.
Remarks:
The test pattern is created by the circuit in TC board.
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 or TC board must be okay and the cause of failure must be in A board.
Blinking Times Contents Check point
1 BACK LIGHT SOS LCD PANEL
P-Board
2 SUB 1.8V SOS A-Board
3 SUB 1.2V SOS A-Board
4 POWER SOS A-Board
P-Board
9 ZWEI2 SOS TC-Board
10 SUB 3.3V SENSE A-Board
12 SOUND SOS A-Board
Speaker