Sharp LC-26SH330, Service Manual

Page: 64 / 223

LC-26SH330, LC-32SH330, LC-42SH330
64
No picture on the display (3)
↓
Does not the picture come out when TV (Cable) is received?
TERMINAL UNIT:
↓
↓ YES
↓ YES
MAIN_UNIT:
↓ YES
↓ YES
<External input SCART1, SCART2>No picture on the display (4)
↓
Does not the picture of the CVBS signal input to SCART1 go out?
Does not the picture of the CVBS signal input to SCART2 go out?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓ YES
↓ YES
Is CVBS signal sent to pin (20) of SCART1 (CN151)?
NO Check the setting of an external input device that connects of
CN151.
Refer to
“
The picture doesn't appear in all modes.
”
NO Check the setting of an external input device that connects of
CN152. Is CVBS signal sent to pin (20) of SCART2 (CN152)?
Is CVBS signal sent to pin (AP33) of IC U401?
Is CVBS signal sent to pin (AT33) of IC U401?
NO
NO
Check the line between IC U401 and CN151.
Check the line between IC U401 and CN152.
Is IF signal output from pin (16), (17) of TUNER (TU102) to pin
(29), pin (30) of IC U101?
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 U101 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.
”
Is MPEG data (CI_INDATA0, TSYNC, TCK) signal from pin (11),
(8) (9) of IC U101 are output to IC U401? Check IC U101 and their peripheral circuits. Replace as required.
NO