Sharp LC-32A28L, Service Manual

Page: 40 / 118

LC-32A28L, LC-42A48L
40
No picture on the display (3)
↓
Does not the picture come out when VHF/UHF is received?
MAIN_UNIT:
↓
↓ YES
↓ YES
↓ YES
<External input Input1(Composite)>No picture on the display (7)
↓
Does not the picture of the composite video signal input to Input1(Composite) go out?
TERMINAL UNIT:
↓
MAIN_UNIT:
↓ YES
↓ YES
<External input HDMI1>No picture on the display (9)
↓
Does not the picture of the HDMI signal input to Input5(HDMI1) go out?
MINI AV_UNIT:
↓
↓
YES
↓ YES
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
NO
Refer to “ The picture doesn't appear in all modes. ”
Is CVBS signal sent to pin (2) of AV3 (CN105) ?
NO
Check the setting of an external input device that connects of
CN105.
Refer to “ The picture doesn't appear in all modes. ”
Is CVBS signal sent to pin (69) of IC U401?
NO
Check the line between IC U401 and CN105.
Is the HOT_PLUG detection function of pin (19) of a HDMI terminal
(CN501) normal?
NO
Check the line between pin (35) of IC U409 and CN501.
Refer to “ The picture doesn't appear in all modes. ”
Check the connection and setup with the external HDMI devices.
Is TMDS signal input into pin (8, 7)/RX2
±
, (6, 5)/RX1
±
, (4, 3)/RX0
±
,
(2, 1)/RXC
±
of IC U409?
Check the line between IC U409 and CN501.
NO
Is the DIF signal output from pin (10) and pin (11) of TUNER
(TU102)? Check the tuner and its peripheral circuits. Replace as required.
Is the DIF signal sent to pin (85) and pin (86) of IC U401?
Check IC U401 its peripheral circuits.