Sharp LC-19SH7E/RU, Service Manual, Page: 76 / 267

LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
76
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT:
↓
↓ NO
YES
↓ YES
PANEL_UNIT:
↓ YES
↓ YES
No picture on the display (2)
↓
Does not the picture come out when VHF/UHF is received?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓ YES
↓ YES
Is LCD controller's control signal normal?
Is the above-mentioned LVDS signals output to connector CN750?
NO
Check the line between IC U400 and CN750.
NO Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
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?
NO
Wire harness is checked.
Is LVDS signal output from 1st_channel and 2nd_channel of IC U400 in each mode?
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CK1N/CK1P)
Check IC U400 and its peripheral control circuits.
Is picture signal input from pin (24) of TUNER (TU201) to pin
(AB24) of IC U400?
Is TUNER_CVBS signal output from pin (24) of TUNER (TU201)?
NO
Check whether I2C is normally accessed between TU201 and IC
U400.
NO
Check the line between IC U400 and TU201.
Refer to
“
The picture doesn't appear in all modes.
”