Sharp LC-19LE430E, Service Manual

Page: 56 / 206

LC-19LE430E/UK, LC-22LE430E/UK, LC-26LE430E/UK, LC-32LE430E/UK
56
No picture on the display (3)
↓
Does not the picture come out when Digital TV (Antenna/Cable) is received?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓ YES
↓ YES
↓ YES
↓ YES
<External input SCART>No picture on the display (4)
↓
Does not the picture of the CVBS signal input to SCART go out?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓ YES
↓ YES
Is CVBS signal sent to pin (20) of SCART (CN151)?
NO
Check the setting of an external input device that connects of
CN151.
Refer to
“
The picture doesn't appear in all modes.
”
Is CVBS signal sent to pin (175) of IC U401?
NO
Check the circuit between IC U401 and CN151.
Is IF signal output from pin (13), (14) of TUNER (TU101)/ pin (10),
(11) of TU102 to pin (35), (36) of IC U1011?
Are 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 U1011 and their peripheral circuits. Replace
as required.
NO Do X4150 (27.00MHz) oscillate? Check X4150 and its peripheral circuits.
Refer to
“
The picture doesn't appear in all modes.
”
Are MPEG data (DEMOD_INDATA0, TSYNC, TVAL, and TCK)
signals from pin (15), (16), (17), (18) of IC U1011 output to IC
U401? Check MPEG data bus from IC TU1011 to IC U401.
NO