Read Sharp LC-42LE320E Service Manual online
2008-03-14
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
121
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT:
↓NO
YES
↓YES
MEMC_UNIT:
↓YES
↓YES
PANEL_UNIT:
↓YES
↓YES
No picture on the display (2)
↓
Does not the picture come out when TV (Antenna) is received?
TERMINAL UNIT:
↓
↓YES
MAIN_UNIT:
↓YES
↓YES
Is LCD controller's control signal normal?
Is the above-mentioned LVDS signals output to connector CN408?
NO
Check the line between IC U401 and CN408.
NO
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
Check the panel module.
Similarly, is the LVDS signal input to connector of the panel
module?
module?
NO
Wire harness is checked.( MEMC module to Panel module )
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)
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CK1N/CK1P)
Check IC U401 and its peripheral control circuits.
Is IF signal output from pin (16), (17) of TUNER (TU102) to pin
(AH35), pin (AH37) of IC U401?
(AH35), pin (AH37) of IC U401?
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U401 supplied?
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.
as required.
NO
Do X4150 (54.00MHz) oscillate?
Check X4150 and its peripheral circuits.
Refer to “The picture doesn't appear in all modes.”
Similarly, is the LVDS signal input to connector CN405 of the
MEMC module?
MEMC module?
NO
Wire harness is checked.
Check is the LVDS signal out from the connector CN406, CN407 of
MEMC module.
MEMC module.
Check IC U404 and its peripheral circuits.
NO
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