Monday, February 08, 2016

How to enter service mode Panasonic LCD TV - PANASONIC TC-L42U12 – Service mode – Led blinking code – Voltage adjustments – hotel mode - LCD Television repair and service

Category: LCD Television Repair and Service 

Contents of this article

  • How to activate service mode
  • Power LED blinking and causes 
  • Self check mode 



PANASONIC TC-L42U12 

Service Mode
How to enter into Service Mode
While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.
Key command
[1] button...Main items Selection in forward direction
[2] button...Main items Selection in reverse direction
[3] button...Sub items Selection in forward direction
[4] button...Sub items Selection in reverse direction
[VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )
How to exit
Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
SRV-TOOL
How to access
1. Select [SRV-TOOL] in Service Mode.
2. Press [OK] button on the remote control.
Display of SOS History
SOS History (Number of LED blinking ) indication.
From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory shipment setting].
POWER ON TIME/COUNT
Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3sec.
Time : Cumulative power on time, indicated hour : minute by decimal
Count : Number of ON times by decimal
Note : This indication will not be cleared by either of the self-checks or any other command.
Exit
1. Disconnect the AC cord from wall outlet.
Hotel mode
Access command to the Hotel mode setup menu In order to display the Hotel mode setup menu, please enter the following command (within 2 second). [TV] : Vol. [Down] + [REMOTE] : INPUT (3 times)
To exit the Hotel mode setup menu
Disconnect AC power cord from wall outlet.
How to access
Self-check indication only:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control
for more than 3 seconds.
Self-check indication and forced to factory shipment setting:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote
control for more than 3 seconds.
Exit
Disconnect the AC cord from wall outlet.
Power LED Blinking 
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.

Measurements and Adjustments
Voltage chart of P-board
VOLTAGE
TEST POINT
SPECIFICATION (Reception state)
5.136
TP2831
5.2 ± 0.26 V
3.305
TP5480
3.3 ± 0.16 V
1.261
TP5602
1.26 ± 0.06 V
1.835
TP5601
1.83 ± 0.09 V
3.309
TP5600
3.3 ± 0.16 V
4.775
TP5405
5 ± 0.25 V
9.097
TP5481
9 ± 0.45 V
30.94
TP8300
30 ± 1.5 V
17.33
TP5431
17 ± 0.85 V
17.33
TP5417
17 ± 0.85 V
11.97
TP5432
12 ± 0.6 V
11.95
TP5413
12 ± 0.6 V
5.709
TP5433
5.6 ± 0.28 V
5.706
TP5439
5.6 ± 0.28 V
Voltage chart of A-board
VOLTAGE
TEST POINT
SPECIFICATION (Reception state)
STB5V
TP2831
5.2 ± 0.26 V
STB3.3V
TP5480
3.3 ± 0.16 V
SUB1.2V
TP5602
1.26 ± 0.06 V
SUB1.8V
TP5601
1.83 ± 0.09 V
SUB3.3V
TP5600
3.3 ± 0.16 V
SUB5V
TP5405
5 ± 0.25 V
SUB9V
TP5481
9 ± 0.45 V
BT30V
TP8300
30 ± 1.5 V
P17V
TP5431
17 ± 0.85 V
SOUNDVCC
TP5417
17 ± 0.85 V
DTV12V
TP5432
12 ± 0.6 V
PANEL12V
TP5413
12 ± 0.6 V
5VS
TP5433
5.6 ± 0.28 V
TUNER6V
TP5439
5.6 ± 0.28 V