Wednesday, December 02, 2015

PANASONIC TX-LR42E5 Led tv service mode standby led blinking code and adjustments

Contents of this article 

  • How to enter the service mode 
  • Standby led blinking code 
  • Self check mode 
  • Hotel mode
  • Troubleshooting 

LED TV 

PANASONIC TX-LR42E5 

SERVICE MODE AND VOLTAGE ADJUSTMENTS 

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.
Contents of adjustment mode
# Value is shown as a hexadecimal number.
# Preset value differs depending on models.
# After entering the adjustment mode, take note of the value in each item before starting adjustment.
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
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.
How to enter to 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
Troubleshooting
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 timing chart
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:
LED BLINKING CODES 
Name
Factor
R_LED Blink
BL_SOS
SOS from PANEL inverter
1
POWER_SOS
SOS from POWER Curcuit
3
SOUND_SOS
SOS from audio AMP
9
 Voltage chart of A-board
Set A-Board to a dummy set and check the satisfaction with the specified voltage
Power Supply Name
Measurement Point
Specification
SUB1.1V
TP8100
1.10V - 1.22V
SUB1.5V
TP8101
1.435V - 1.585V
SUB1.8V
TP8700
1.7V -1.9V
SUB3.3V
TP5400
3.17V - 3.43V
SUB5V
TP5420
4.95V - 5.65V
USB5V
TP5440
4.80V - 5.25V
PNL12V
TP4004 or TP4005
11.45V ± 12.55V
 Voltage chart of P-board
Set P-Board to a dummy load and check the satisfaction with the specified voltage
Voltage
Test Point
Step 1
Step 2
24V (PANEL)
TP7512 or TP7513
< 1V
24V ± 1.2V
16V
TP7508 or TP7514
< 1V
16.1V ± 0.6V
5VS
TP7412 or TP7507
5.3V ± 0.1V
5.3V ± 0.1V
PFC
TP7201 or TP7202
< 340V
390V ± 15V