LC-50LD264–LC-50LD265–LC-50LD265RU–LC-50LD266
27
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT: ↓
↓
YES
↓YES
PANEL_UNIT: ↓YES
↓YES
No picture on the display (2)
↓
Does not the picture come out when TV is received?
TERMINAL UNIT: ↓
↓YES
MAIN_UNIT: ↓YES
↓YES
<External input (Component)>No picture on the display (3)
↓
Does not the picture of the component video signal input to Component go out?
TERMINAL_UNIT: ↓
MAIN_UNIT:
↓YES
↓YES
Is LCD controller's control signal normal?
Check the line between IC U401 and CN408.
NO
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_VCC, and it peels off and whether normality is checked.
Check the panel module.
Similarly, is the LVDS signal input to connector of the panel
NO
Wire harness is checked. (Main board to Panel module )
Is LVDS signal output from 1st_channel and 2nd_channel of IC
U401 in each mode?
Check IC U401 and its peripheral control circuits.
Is DIF signal output from pin (5/6) of TUNER (TU101) to pin
(Y19/W18) of IC U401?
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U401 supplied?
NO
Each power supply circuit is checked.
NO
Check the tuner, IC U401 and their peripheral circuits. Replace
as required.
NO
Do X401 (24MHz) oscillate?
Check X401 and its peripheral circuits.
Refer to “The picture doesn't appear in all modes.”
NO
Is Component Y/Pb/Pr signal sent to pin (2)/ Y_IN_1, (4)/ PB_IN_1,
(7)/ PR_IN_1 of AV1(CN116) ?
Check the setting of an external input device that connects of
CN116.
Is Component Y/Pb/Pr signal sent to pin (V13)/Y1, (W14)/PB1,
(Y14)/PrR1of IC U401?
NO
Check the line between IC U401 and CN116
Refer to “The picture doesn't appear in all modes.”
Is the above-mentioned LVDS signals output to connector CN408?
NO
NO
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