PANASONIC LCD TV - TC-L55E50 - Service mode - LED Blinking and Causes - Self check mode - Voltage adjustments - TXN/P1SJUU - TNPA5610CA Power supply board - LCD television repair and service - Manual Tips

Category: LCD Television Repair and Service 

Contents of this article 

• How to Access service mode 
• Hotel mode setting 
• Led blinking codes and cause 
• Voltage settings 

PANASONIC TC-L55E50

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.

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.

Self Check Mode
1. Press the ‘MENU’ button (on the remote control) and the ‘VOL DOWN’ button on the LCD panel.
2. Press ON/OFF button on the panel to Exit.
Hotel Mode Adjustment
1. Press the ‘VOLUME DOWN’ button on the TV panel and simultaneously press the INPUT button on the remote control 3
times to enter Hotel Mode.
2. Set Hotel mode ‘on/off’, then press ‘EXIT’ to come out.
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.

Check of the IIC bus lines
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 and causes 
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:

POWER LED BLINKING 

R_LED Blink	Name	Factor
1	BL_SOS	SOS from PANEL inverter
3	POWER_SOS	SOS from POWER Curcuit
9	SOUND_SOS	SOS from audio AMP

 Measurements and Adjustments

Voltage chart of A-board
Set A-Board to a dummy set and check the satisfaction with the specified voltage as following table.

VOLTAGE	TEST POINT	SPECIFICATION
PANEL12V	TP4004/TP4005	11.45V - 12.55V
USB_5V	TP5440	4.80V - 5.25V
SUB5V	TP5420	4.95V - 5.65V
SUB3.3V	TP5400	3.17V - 3.43V
SUB1.8V	TP8700	1.7V - 1.9V
SUB1.5V	TP8101	1.435V - 1.585V
SUB1.1V	TP8100	1.10V - 1.22V
FRC1.0V	TP9300	0.95V - 1.05V
FRC1.8V	TP9301	1.71V - 1.89V

Voltage chart of P-board

Set P-Board to a dummy set and check the satisfaction with the specified voltage as following table.

VOLTAGE	TEST POINT	OPERATE
5VS	TP7412,7507	5.3V ± 0.1V
16V	TP7508,7514	16.1V±0.6V
24V	TP7512,7513	24V ± 1.2V

TXN/P1SJUU - TNPA5610CA Power supply board

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