PANASONIC TC-19LX50 - TC-23LX50 - TC-19LE50 - TC-23LE50 TROUBLE SHOOTING AND SERVICE ADJUSTMENT
LCD TV
TROUBLE SHOOTING AND SERVICE ADJUSTMENTPower 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
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Contents
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Detection
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2
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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
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Low or no voltage at
MAIN 9V generated by Q861 |
Pin 19 of IC1101 (MCU)
SOS : LOW Normal : HIGH |
5
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Low or no voltage at
SUB 5V generated by IC853 |
Pin 20 of IC1101 (MCU)
SOS : LOW Normal : HIGH |
6
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Low or no voltage at
SUB 9V generated by IC851 |
Pin 18 of IC1101 (MCU)
SOS : LOW Normal : HIGH |
7
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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
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No communication with IC4016 (GC4)
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Through IIC bus
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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.
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.
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.
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
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
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.
· 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
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Sub item
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Remarks
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MAIN
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YGAIN
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Video Level (RF, VIDEO, S, COMPONENT)
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B-Y
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Video Level (RF, VIDEO, S, COMPONENT)
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R-Y
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Video Level (RF, VIDEO, S, COMPONENT)
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PILEN
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PILEN Current
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SUB
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COLOR
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Sub color
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TINT
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Sub tint
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BACK-L
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Sub back light
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BRIGHT
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Sub bright
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B-Y-G
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B-Y Gain
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R-Y-A
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R-Y demodulation axis
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TEMP
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Temp data
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GAMMA
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WHITE
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Test pattern (100% White)
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RED
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Test pattern (100% Red)
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GREEN
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Test pattern (100% Green)
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BLUE
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Test pattern (100% Blue)
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GRAY
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Test pattern (50% White)
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R-GAIN
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Test pattern (100% White) R-GAIN
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G-GAIN
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Test pattern (100% White) G-GAIN
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B-GAIN
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Test pattern (100% White) B-GAIN
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R-CENT
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Test pattern (50% White) R-CENT
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G-CENT
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Test pattern (50% White) G-CENT
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B-CENT
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Test pattern (50% White) B-CENT
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OPT
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OPT00
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(TV)
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RM
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CODE
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Remote control code A or B
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MTS
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MTSIN
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RF Audio input
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SEPAH
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Stereo separation Hi
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SEPAL
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Stereo separation Low
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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.
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.
