Sharp LC-32A28L Service Manual page 40

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