Sharp LC-42SH330 Service Manual page 63

The picture doesn't appear in all modes.
MAIN UNIT:
Is LVDS signal output from 1st_channel and 2nd_channel of IC U401 in each mode?
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CK1N/CK1P)
Is the above-mentioned LVDS signals output to connector
Is LCD controller's control signal normal?
MEMC_UNIT:
Similarly, is the LVDS signal input to connector CN405 of the
MEMC module?
Check is the LVDS signal out from the connector CN406, CN407
of MEMC module.
PANEL_UNIT:
Similarly, is the LVDS signal input to connector of the panel
module?
Check the panel module.
Does not the picture come out when TV (Antenna) is received?
TERMINAL UNIT:
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U401 supplied?
Is IF signal output from pin (16), (17) of TUNER (TU102) to pin
(AH35), pin (AH37) of IC U401?
MAIN_UNIT:
Do X4150 (54.00MHz) oscillate?
Refer to "The picture doesn't appear in all modes."
No picture on the display (1)
↓
YES
↓YES
↓YES
↓YES
↓YES
↓YES
No picture on the display (2)
↓
↓
↓YES
↓YES
↓YES
2008-03-14
LC-26SH330, LC-32SH330, LC-42SH330
Check IC U401 and its peripheral control circuits.
NO
Check the line between IC U401 and CN408.
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
NO
PANEL_VCC_ON/OFF, and it peels off and whether normality
is checked.
NO
Wire harness is checked.
Check IC U404 and its peripheral circuits.
NO
NO Wire harness is checked.( MEMC module to Panel module )
NO Each power supply circuit is checked.
NO
Check the tuner, IC U401 and their peripheral circuits.
Replace as required.
NO Check X4150 and its peripheral circuits.
63
↓NO