Wednesday, January 13, 2016

PANASONIC TX-LR50B6 Service Mode - Led blinking code - self diagnostics – LED Television Repair and Service

Category: LED Television Repair And Service 

Contents of this article 

  • How to access to service mode 
  • LED blinking codes
  • Self Check Mode
  • Voltage Check 


PANASONIC TX-LR50B6

Service Mode
How to enter into Service Modes
While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.
How to exit Service mode 
Switch off the power with the [POWER] button on the main unit or the [POWER] 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
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 Blink
SOS detection
1
BL_SOS
7
SUB_3.3V
9
SOUND_SOS
8
OVP SOS
10
GCX/FRC_SOS
12
BE(sLD8/PRO4) SOS
13
Emergency SOS
3
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.
Power Supply Name
Measurement Poin
Specification
PNL12V
TP4097
12.1 ± 0.8V
SUB3.3V
TP5400
3.32 ± 0.165V
SUB1.1V
TP8101
1.14 ± 0.07V
SUB1.5V
TP8100
1.52 ± 0.05V
SUB5V
TP5420
5.0 ± 0.25V
HDMI3.3V
TP8000
3.3 ± 0.16V
Voltage chart of P-board
Set P-Board to a dummy load and check the satisfaction with the specified voltage as following table.
Output
Test Point
Step 1
Step 2
24V (PANEL)
TP7407 or TP7408
<1V
24 ± 1.2V
16V
TP7410 or TP7412
<1V
15.7 ± 0.6V
5VS
TP7501
5.3 ± 0.2 V
5.3 ± 0.2V
PFC
TP7201
<340V
390 ± 15V