Sharp LC-39LE440U Service Manual page 39

Does not the picture come out when VHF/UHF is received?
Main UNIT:
Check TU_VCCr/VCCK/DDRV/AV33/DV33/+3V3SB
is applied to Tuner and U2102 or not.
YES
Is the DIF signal output from pin (10) and pin (11) of
TUNER
(TU9102)?
YES
Is the DIF signal sent to pin (58) and pin (59) of IC
U2102?
YES
Refer to "The picture doesn't appear in all modes."
No picture on the display (2)
NO
NO
NO
38
Check each power IC and peripheral
components are correct or not.
Check the tuner and its peripheral circuits.
Replace as required.
Check IC U2102 its peripheral circuits.