Sharp LC-19S7E-BK Service Manual page 33

The picture doesn't appear in all modes.
MAIN UNIT:
Is LVDS signal output from 1st_channel and 2nd_channel of IC U4201 in each mode?
(RXO0+/RXO0-),( RXO1+/RXO1-),( RXO2+/RXO2-),( RXO3+/RXO3-),( RXOC+/RXOC-)
YES
Is the above-mentioned LVDS signals output to connector
Is LCD controller's control signal normal?
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 VHF/UHF is received?
TERMINAL UNIT:
Is TUNER_CVBS signal output from pin (16) of TUNER (TU1101)?
MAIN_UNIT:
Is picture signal input from pin (16) of TUNER (TU1101) to pin
35(CVBS0) of IC U4201?
Refer to "The picture doesn't appear in all modes."
No picture on the display (1)
↓
↓
↓YES
↓YES
↓YES
No picture on the display (2)
↓
↓
↓YES
↓YES
2008-03-14
LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK
Check IC U4201 and its peripheral control circuits.
NO
Check the line between IC U4201 and CN7502.
NO Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_PWR, and it peels off and whether normality is checked.
NO
FFC cable is checked.
NO
Check whether I2C is normally accessed between TU201 and IC
U400.
NO Check the line between IC U4201and TU1101.
33
↓NO