Wednesday, January 06, 2016

PANASONIC TX-LR42D25 Service mode led blinking code and hotel mode – LCD television repair

Category: LCD Television Repair and service 

Contents of this article 

  • How to enter to Service mode 
  • Self check mode 
  • Led blinking codes 




PANASONIC TX-LR42D25 

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.
Service Mode Adjustment
1. Press the ‘RECALL’ button on the remote control and press ‘-’ vol button on the LCD panel.
2. Press button number 1 on the remote control to select for Adjustment.
3. Self Check to Exit.
Self Check Mode
1. Press the ‘MENU’ button (on the remote control) and the ‘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’, then press ‘EXIT’ to come out.
Troubleshooting Guide
Use the self-check function to test the unit.
1. Checking the IIC bus lines
2. Power LED Blinking timing
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, 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:
Blinking times
Contents
1
Inverter_SOS
2
FAN_SOS
3
SOS
4
SUB 12V_SENSE_SOS
7
Sub_ 3.3V_SENSE_SOS
9
SOUND_SOS
12
BE)Sld)_SOS
13
Emergency SOS

Measurements and Adjustments
Power Supply to Check A-Board
1. Add a regulated voltage to following TP.
Power Supply Name
TP No.
Voltage (V)
5.8VS
TP2750
5.8 +/- 2%
STB_SUB_5.8V
TP2789
5.8 +/- 2%
GND
TP2785
0V
BL_SOS
TP2780
0V

2. Turn on a MAIN_SW
3. SUB_ON (TP2814) “High” / Add a regulated voltage to following TP after SUB_ON (TP2767) becomes “High”.
Power Supply Name
TP No.
Voltage (V)
P17V
TP2782
18V +/- 2%
SUB_F12V_15V
TP2783
12V +/- 2%