Sunday, February 15, 2015

PANASONIC TC-19LX50 - TC-23LX50 - TC-19LE50 - TC-23LE50 TROUBLE SHOOTING AND SERVICE ADJUSTMENT

PANASONIC TC-19LX50TC-23LX50TC-19LE50 /TC-23LE50 

LCD TV

TROUBLE SHOOTING AND SERVICE ADJUSTMENT 

Power LED Blinking
When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
Blinking times
Contents
Detection
2


Inverter SOS
No voltage (+24V) from Power Unit or
failure of Inverter in LCD Panel.
Pin 110 of IC1101 (MCU)
SOS : HIGH
Normal : LOW
3


Low or no voltage at
MAIN 9V generated by Q861

Pin 19 of IC1101 (MCU)
SOS : LOW
Normal : HIGH
5


Low or no voltage at
SUB 5V generated by IC853

Pin 20 of IC1101 (MCU)
SOS : LOW
Normal : HIGH
6


Low or no voltage at
SUB 9V generated by IC851

Pin 18 of IC1101 (MCU)
SOS : LOW
Normal : HIGH
7




Over voltage at
Sound 10V, SUB 9V, SUB 5V or
Panel 5V.
Low or no voltage at
BT30V or Panel5V.

Pin 111 of IC1101 (MCU)
SOS : LOW
Normal : HIGH

9
No communication with IC4016 (GC4)
Through IIC bus

Troubleshooting Guide
Self-check function
When phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at the time of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits.Also, when "the power fails from time to time", display on the screen can be used to confirm the occurrence and to limit the scope for the defective circuits. Any programmed channels, channels caption data and some other user defined settings will be erased and return to factory setting.
How to access
Access
Produce TV reception screen and, while pressing [VOLUME-] button on the main unit, press [SLEEP] button on the remote controller unit simultaneously.
Exit
When one of the buttons for channel selection etc. is pressed, the display returns to the normal screen.
HOW TO ENTER TO SERVICE MODE 

While pressing [VOLUME- ] button of the main unit, press [RECALL] button of the remote control three times in a row (within 2 seconds).

Adjustment method.....Use the remote control.
1 button...Main items Selection in forward direction
2 button...Main items Selection in reverse direction
3 button...Sub items Selection in forward direction
4 button...Sub items Selection in reverse direction
VOL button...Value of sub items change in forward direction , in reverse direction
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.
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.
Main item
Sub item
Remarks
MAIN



YGAIN
Video Level (RF, VIDEO, S, COMPONENT)
B-Y
Video Level (RF, VIDEO, S, COMPONENT)
R-Y
Video Level (RF, VIDEO, S, COMPONENT)
PILEN
PILEN Current
SUB







COLOR
Sub color
TINT
Sub tint
BACK-L
Sub back light
BRIGHT
Sub bright
B-Y-G
B-Y Gain
R-Y-A
R-Y demodulation axis
TEMP
Temp data
GAMMA











WHITE
Test pattern (100% White)
RED
Test pattern (100% Red)
GREEN
Test pattern (100% Green)
BLUE
Test pattern (100% Blue)
GRAY
Test pattern (50% White)
R-GAIN
Test pattern (100% White) R-GAIN
G-GAIN
Test pattern (100% White) G-GAIN
B-GAIN
Test pattern (100% White) B-GAIN
R-CENT
Test pattern (50% White) R-CENT
G-CENT
Test pattern (50% White) G-CENT
B-CENT
Test pattern (50% White) B-CENT
OPT
OPT00
(TV)
RM
CODE
Remote control code A or B
MTS
MTSIN
RF Audio input
SEPAH
Stereo separation Hi
SEPAL
Stereo separation Low

Measurements and Adjustments
Video Signal Level Adjustment (RF)
1. Receive studio color bar by RF signal input. (Viewing mode: standard, LCD AI: OFF, Back Light: +30 )
2. In service mode choose adjust item then press remote button 1 into main mode then press remote 3 into Y Gain and press remote button ì8î to do auto adjustment.
3. Press remote button 2 go back main menu.