Sharp LC-19LE320, Service Manual, Page: 83 / 367

2008-03-14
LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
83
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 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.
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 U401 in each mode?
(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 ?
Is the voltage 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.
NO
Do X4150 (54.00MHz) oscillate? Check X4150 and its peripheral circuits.
Refer to “ The picture doesn't appear in all modes. ”