Sharp LC-19D1E/S-BK/WH, Руководство по обслуживанию

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LC-19D1E/S-BK/WH
4 – 12
<0n input of the DTVtuner> No picture on the display (1)-2
No picture appears on LCD during the
DTV tuner reception.
YES
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 pin (9)(8) 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". (IC801 (A5)(C4)pin)
(AV-UNIT) YES
(DIGITAL-UNIT)
Is the DTV-R/G/B signal output from
pin (4)/(3)/(2) of Connector P503?
Is the DTV-CVBS signal output from
pin (6) of connector P503? NO Is the DTV-R/G/B signal output from
pin (15)/(16)/(17) of IC4001(D-PRO-
CESSOR)? Is the DTV-CVBS sig-
nal output from pin (18) of IC4001? YES Check connector SC4602 and
IC4603. Check Q4601.
NO
Is the serial- signal (TOUTD[7]) input
to pin (36) of IC4001(D-PROCES-
SOR)? YES Check pins (3-129)/(151-212)/(8-
204) of 3.3V/2.5V/1.2V power line of
IC4001, pins (6)(7) of I2C line, and
soldering.
(AV-UNIT) NO
Is the serial signal (FED[7]) output
from pin (33)-(43) of IC202(DVB-T)? YES Check pins(3) of Connector SC4601
or pins(3) of connector P202.
NO
Is the digital-IF signal IF(D1/D2) input
to pin (10)/(11) of IC202(DVB-T)? YES Check pins (22)/(2)/(19) of 3.3V/
2.5V/1.0V power supply input of
IC202(DVB-T), pins (29)/(30) of I2C
line, and soldering.
NO
Is the Digital-IF signal IF(D1/D2) out-
put from pin (17)/(16) of Tuner
(TU201)?
NO
Check the B5V/B5V(CONT)/IF5V
power supply input pin (11)/(1)/(3) of
TUNER (TU201), pins (9)(8) of I2C
line, and soldering.
NO
Replace Tuner (TU201).