Power Led Blinking Timing Chart; Lcd Panel Test Mode - Panasonic TC-L47ET5 Service Manual

7.2.

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.
7.3.

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 [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.
Blinking Times
1 BACK LIGHT SOS
3 IROM BOOT PROGRAM SOS
7 SUB 3.3V SENSE SOS
8 SOS (T-CON power)
9 SOUND SOS
10 ZWEI/FRC SOS
12 BE SOS
13 EMERGENCY SOS
20 2nd BOOT PROGRAM SOS
(Watchdog timer over flow)
21 2nd BOOT PROGRAM SOS
(System error)
22 2nd BOOT PROGRAM SOS
(Main system bus freeze)
23 2nd BOOT PROGRAM SOS
(Accidental interrupt signal)
24 2nd BOOT PROGRAM SOS
(NAND Flash memory data transfer error shut
down)
25 2nd BOOT PROGRAM SOS
(Unsupported NAND Flash memory)
Contents
16
Check point
LCD PANEL
P-Board
A-Board
P-Board
A-Board
A-Board
A-Board
Speaker
A-Board
A-Board
A-Board
A-Board
A-Board
A-Board
A-Board
A-Board
A-Board