Read Sharp TU-X1E (serv.man7) Service Manual online
TU-X1E/RU
6 – 9
<When DTV tuner is input>
No picture on the display (1)
No picture appears on LCD during the DTV tuner reception. (The Monitor side is to be normal.)
Checklist:
1) Is "INPUT SOURCE" button
˴on the remote control set up correctly ? Set it as "DTV" with the INPUT SOURCE button
on
the remote control.
2) Is MENU-Picture-Backlight/Contrast/Brightness set to "MIN" ?
Set it to an appropriate level.
3) Is the level of pins (8) and (9) of tuner (TU201) at "H"?
These are serial communications lines (I2C) for the control. If it is "L", check
whether something pulls it to "L". (pins (A5) and (C4) of IC801)
YES
Is the digital output signal
(FED_D/FECLK) outputted properly to
pins (48) and (50) of MB connector
(FED_D/FECLK) outputted properly to
pins (48) and (50) of MB connector
Is the power fed properly to IC8101,
IC4602 and IC4804?
IC4602 and IC4804?
Recheck the power circuit.
Are the SDA1/SCL1/SDA2/SCL2 signals
of I2C fed to IC8101, while are theSDA1/
SCL1 signals and the SDA2/SCL2 signals
fed to IC4602 and IC4804, respectively?
of I2C fed to IC8101, while are theSDA1/
SCL1 signals and the SDA2/SCL2 signals
fed to IC4602 and IC4804, respectively?
Check to see where the I2C line
gets low.
gets low.
Are the soldering and other factors of
IC8101, IC4602 and IC4804 as specified?
IC8101, IC4602 and IC4804 as specified?
Repair the short-circuited spot as
required.
required.
Replace IC8101, IC4602 or IC4804 as
required.
required.
Is the differential output signal (HDMITX_
[0:
[0:
㧯]) outputted properly topins (1) thru
(12) of HDMI output terminal (SC4801)?
Check the HDMI cable or refer to the
Monitor Video Troubleshooting.
Monitor Video Troubleshooting.
NO
NO
YES
YES
YES
NO
NO
NO
YES
B
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