Sharp LC-22LE320 Service Manual page 58

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
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 CN408?
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 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
No picture on the display (2)
↓
↓
↓YES
↓YES
↓YES
Check IC U401 and its peripheral control circuits.
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.
NO
Wire harness is checked.
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.
58
↓NO