Sharp Aquous 4T-B70CJ1U, Service Manual, Page: 30 / 63

4T-B70CJ1 TROUBLE SHOOTING 4 - 28
2-3. With <Video>signalinput No video onscreen(2)
↓
Yes
NO
↓
Yes
NO
↓
Yes
NO
↓
Yes
2-4. With <HDMI1/HDMI2>signalinput No video onscreen(3)
↓
Yes
NO
↓
Yes
NO
↓
Yes
NO
↓
Yes
Check FFC cable,LCD controller (incl.
panel)and their peripheral circuits.
Check FFC cable, LCD controller (incl.
panel) and their peripheral circuits.
No external input video onscreen < INPUT
3 >
No external input video onscreen HDMI1
/HDMI2
Is INPUT 3 selected on the input select
menu screen? Select INPUT 3 on the input select
menu screen to pick up the right input
signal.
Is there the video signal input at pin (F1) of
IC3301? Check the line between pin (3) of
J502 and pin (F1) of IC3301.
Are there the signal outputs (pin of IC3301
to SC3801)?
Check IC3301 and its peripheral circuits
to SC3801
Is <HDMI 1/HDMI2 ) selected on the menu
screen ? Select <HDMI1 / HDMI2 >
select menu screen to pick up the right
signal input
Are there signal outputs from
SC1501/SC1502 to IC3301?
Check the signal from SC1501/SC1502 to
IC3301.
Are there the signal outputs (pin of IC3301
to SC3801)? Check IC3301 and its peripheral circuits.