Sharp AQUOS LC-42LE40E, Service Manual

Page: 45 / 157

LC-32LE40E-LC-42LE40E
45
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
Is LCD controller's control signal normal?
Check the line between IC U401 and CN409, CN408.
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. (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 (13), (14) of TUNER (TU101) to pin
(184), (185) of IC U401?
Is the voltages 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.
Refer to “ The picture doesn't appear in all modes. ”
Is the above-mentioned LVDS signals output to connector
CN409(for32
″ ), CN408(for 42 ″ )?
NO
NO
Do X4150 (27MHz) oscillate?
NO
Check X4150 and its peripheral circuits.