Sharp 4T-B70CJ1U Service Manual page 30

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