Monday, January 25, 2016

PANASONIC LED TV - TH-L42E3D - Service mode - Led blinking code - Self check mode - Voltage check - LED Television Repair and service

Category: LED Television Repair and Service 

Contents of this article

  • How to access the service mode  
  • Led blinking code  
  • Voltage measurement  



PANASONIC TH-L42E3D

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 AV 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
When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, thedefective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:
Times
SOS
PCB NAME
1
BackLight_SOS




A BOARD
2
FAN_SOS
3
SOS(Tuner_SOS)
4
SUB12V_SENSE_SOS
7
SUB3.3V_SENSE_SOS
9
SOUND_SOS
10
ZWEI2_SOS
12
BackEnd(sLD)_SOS
13
EMERGENCY_SOS
14
IROM_SOS
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
SUB1.8V
TP8700
1.74 - 1.90 V
SUB1.2V
TP8100
1.18 - 1.32 V
SUB3.3V
TP8701
3.19 ± 3.46 V
SUB5V
TP8702
4.75 - 5.25 V
STB5V
TP5400
4.9 - 5.1 V
SUB1.5V
TP8101
1.4 - 1.6 V
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
SPECIFICATION
PFC390V
TP7201, 7202
390 ± 15V
LED24V
TP7514, 7515
24 ± 2V
DTV16V
TP7503, 7504
15.6 ± 1.5V
STBY6V
TP7501, 7502
5.8 ± 0.8V
5.8 ± 0.8V