Sharp LC-26SA1E Service Manual page 42

LC-26SA1E/RU, LC-32SA1E/RU
<On input of the tuner (U/V)>
No picture appears on LCD during the tuner (U/V) reception.
Checklist:
1) Is "INPUT SOURCE" button
2) Is MENU-PICTURE-Contrast/Brightness set to "MIN"? ••• Set it to an appropriate level.
3) Is ANT-CABLE disconnected or connected improperly? ••• Connect it correctly as per the operation manual.
Is level of pins (4) and (5) of tuner (TU201) and pins (10) and (11)
of IC201 (IF-DEMOD) at H?
Is the video signal (IF) sent from pin (11) of tuner (TU201)?
Is video signal sent from pin (17) of IC201 (IF-DEMOD)?
Is the video signal VIN1 (ATUNER-CVBS) sent to pin (191) of
lC3002 (VCT)?
Is LVDS video signal (LVDS_0N/0P-3N/3P) sent to pins (141)/
(140) - (129)/(128) of IC3002 (VCTP), and is CLK signal
(LVDS_CN/CP) sent to pins (132)/(131)?
Is LVDS video signal (LVDS_0N/0P-3N/3P) sent to pins (12)/(13)
-(24)/(25) of CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK
signal (LVDS_CN/CP) sent to pins (21)/(22)?
Is power (LCD5V) supplied to pins (2) - (5) of CONNECTOR CN1
in LCD-CONT-UNIT?
Replace LCD-CONT-UNIT.
No picture on the display (1)
on the remote control set up correctly? ••• See the operation manual and set "INPUT SOURCE" to "TV".
YES
YES
YES
YES
YES
YES
YES
YES
NO These are communications lines for control (I2C). Follow the
path and check whether they are forced to L (PULL_DOWN).
NO Check the tuner (TU201) and peripheral circuits.
NO Check FL201 (SAW-FIL), IC201 and peripheral circuits.
NO Check IC201 (IF-DEMOD), CONNECTOR (P201 /SC2705) and
peripheral circuits.
NO Check pins (192)/(170)/(133) of BU3.3V line of IC3002 (VCTP),
pins (185)/(169)/(142) of 1.8V line and peripheral circuits.
NO Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).
NO Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).
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