Sharp TU-X1E (serv.man7) Service Manual ▷ View 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
TU-X1E/RU
6 – 10
Check pins (4) and (2) of MB connector
(SC7901), MB harness and their
peripheral circuits.
(SC7901), MB harness and their
peripheral circuits.
Is the digital signal (FED_D/FECLK)
outputted from pins (9) and (4) of IC7906
(TS-SW)?
outputted from pins (9) and (4) of IC7906
(TS-SW)?
Check to see if the D5V/IF-5V/5V(CONT)
signals at pins (11), (1) and (3) as well as
the SDA/SCA signals at pins (9) and (8),
all on the tuner (TU7501), are as specified.
signals at pins (11), (1) and (3) as well as
the SDA/SCA signals at pins (9) and (8),
all on the tuner (TU7501), are as specified.
Is the digital signal (FED_D/FECLK)
inputted to pins (10) and (3) of
IC7906 (TS-SW)?
inputted to pins (10) and (3) of
IC7906 (TS-SW)?
Is the digital signal
(FED_D_DVBS/FECLK_DVBS) outputted
from pins (21) and (22) of satellite tuner
(TU7901)?
(FED_D_DVBS/FECLK_DVBS) outputted
from pins (21) and (22) of satellite tuner
(TU7901)?
At the time of terrestrial digital
broadcasting
broadcasting
Is the digital signal
(FED_D_DVBS/FECLK_DVBS) inputted
to pins (11) and (2) of IC7906 (TS-SW)?
(FED_D_DVBS/FECLK_DVBS) inputted
to pins (11) and (2) of IC7906 (TS-SW)?
Check the tuner (TU7501
and its peripherals
for soldering, etc. If they are all okay, replace
the terrestrial digital tuner (TU7501).
the terrestrial digital tuner (TU7501).
Is the IF (D1/D2) signal outputted from
pins (17) and (16) of tuner (TU7501)?
pins (17) and (16) of tuner (TU7501)?
Check to see if the VDD/3.3V_T signal sat
pins (13) and (4) as well as the SDA/SCA
signals at pins (8) and (9), allon the satellite
tuner (TU7901), are as specified.
pins (13) and (4) as well as the SDA/SCA
signals at pins (8) and (9), allon the satellite
tuner (TU7901), are as specified.
At the time of satellite digital
broadcasting
broadcasting
Is the digital signal (FED_D/FECLK)
outputted from pins (11) and (9) of
IC7508 (COFDM)?
outputted from pins (11) and (9) of
IC7508 (COFDM)?
Check the tuner (TU7901) and its periphera-
ls for soldering, etc. It they reall okay, replace
ls for soldering, etc. It they reall okay, replace
the digital satellite tuner (TU7901).
YES
NO
NO
NO
NO
NO
NO
NO
B
TU-X1E/RU
6 – 11
<When HDMI is input>
No picture on the display (2)-1
(The Monitor side is to be normal.)
No picture displayed via
EXT5 (HDMI-1) from an
external input device.
EXT5 (HDMI-1) from an
external input device.
No picture displayed via
EXT6 (HDMI-2) from an
external input device.
EXT6 (HDMI-2) from an
external input device.
Is the differential input signal
(TMDS1[D0:D2]
(TMDS1[D0:D2]
r) inputted
to pins (61) thru (68) of
IC4109 (TMDS-SW)?
IC4109 (TMDS-SW)?
Is the IC4106 (E2PROM)
data is accessed by I2C and
read from pins (5) and (6)?
data is accessed by I2C and
read from pins (5) and (6)?
Is the differential inputsignal
(TMDS2[D0:D2]
(TMDS2[D0:D2]
r)inputted
to pins (41) thru(48) of
IC4109 (TMDS-SW)?
IC4109 (TMDS-SW)?
Is the IC4105 (E2PROM)
data is accessed by I2C an
dread from pins (5) and (6)?
data is accessed by I2C an
dread from pins (5) and (6)?
Check the HDMI connection
and others. Or see if the
IC4106 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
and others. Or see if the
IC4106 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
NO
NO
Check the HDMI connection
and others. Or see if the
IC4105 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
and others. Or see if the
IC4105 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
YES
YES
Are the HDMI R/G/B
signals (HDMI_R/G/B[0:9])
outputted from pins (108)
thru (14) of IC4203
(HDMI-Rx)?
signals (HDMI_R/G/B[0:9])
outputted from pins (108)
thru (14) of IC4203
(HDMI-Rx)?
Is the TMDS_[D0:D2]
r
signal outputted from pins
(33) thru (40) of IC4303
(HDMI-Tx)?
(33) thru (40) of IC4303
(HDMI-Tx)?
YES
Is the differential output
signal (HDMITX_[0.C]
signal (HDMITX_[0.C]
r)
outputted to the HDMI
output terminal (SC4801)?
output terminal (SC4801)?
Check the HDMI cable
and the Monitor Video
Troubleshooting.
and the Monitor Video
Troubleshooting.
Check the IC8101 (CPU),
IC4602 (FPGA) and IC4804
(HDMI_Tx) power, SDA
signal, and soldering.
IC4602 (FPGA) and IC4804
(HDMI_Tx) power, SDA
signal, and soldering.
Check the IC4303
(HDMI-Tx) power, SDA2
signal, and soldering.
(HDMI-Tx) power, SDA2
signal, and soldering.
Check the IC4203
(HDMI-Rx) power, SDA2
signal, and soldering.
(HDMI-Rx) power, SDA2
signal, and soldering.
NO
NO
NO
YES
YES
NO
NO
TU-X1E/RU
6 – 12
No picture displayed via
EXT7 (HDMI-3) from an
external input device.
EXT7 (HDMI-3) from an
external input device.
Is the differential inputsignal
(TMDS3[D0:D2]
(TMDS3[D0:D2]
r)inputted
to pins (41) thru (48) of
IC5301 (TMDS-SW)?
IC5301 (TMDS-SW)?
Is the IC5304 (E2PROM)
data is accessed by I2C an
dread from pins (5) and (6)?
data is accessed by I2C an
dread from pins (5) and (6)?
Check the HDMI connection
and others. Or see if the
IC5304 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
and others. Or see if the
IC5304 (E2PROM)'s EDID
data is accessed by I2C in
rewriting the data.
YES
NO
NO
<When HDMI is input>
No picture on the display (2)-2
(The Monitor side is to be normal. )
Are the HDMI R/G/B
signals (HDMI_R/G/B[0:9])
outputted from pins (108)
thru (14) of IC4203
(HDMI-Rx)?
signals (HDMI_R/G/B[0:9])
outputted from pins (108)
thru (14) of IC4203
(HDMI-Rx)?
Is the TMDS_[D0:D2]
r
signal outputted from pins
(33) thru (40) of IC4303
(HDMI-Tx)?
(33) thru (40) of IC4303
(HDMI-Tx)?
YES
Is the differential output
signal (HDMI TX_[0.C]
signal (HDMI TX_[0.C]
r)
outputted to the HDMI
output terminal (SC4801)?
output terminal (SC4801)?
Check the HDMI cable
and refer to the Monitor
VideoTroubleshooting.
and refer to the Monitor
VideoTroubleshooting.
Check the IC8101 (CPU),
IC4602 (FPGA) and
IC4804(HDMI_Tx) power,
SDAsignal, and soldering.
IC4602 (FPGA) and
IC4804(HDMI_Tx) power,
SDAsignal, and soldering.
Check the IC4303
(HDMI-Tx) power, SDA2
signal, and soldering.
(HDMI-Tx) power, SDA2
signal, and soldering.
Check the IC4203
(HDMI-Rx) power, SDA2
signal, and soldering.
(HDMI-Rx) power, SDA2
signal, and soldering.
NO
NO
NO
YES
YES
Click on the first or last page to see other TU-X1E (serv.man7) service manuals if exist.