Sharp LC-19LE430E Service Manual page 56

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