Sharp LC-32WD1E/S/RU Service Manual page 43

LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
NO picture on display via EXT-3 Y/C input
No picture on LCD screen when EXT-3 Y/C input source selected
Checklist:
1) Is "INPUT SOURCE" button
2) Is MENU-PICTURE-Contrast/Brightness set to "MIN" ? ==> Set it to appropriate level
3) Check connection to external device ==> Connect it correctly as per the operation manual for the device
Are Y/C video signals arriving to pin1(Y) and pin3(C) of connector
X014 on Side I/O PCB ?
Are Y/C signals present on pin1 and pin3 of X0208 on Main PCB ?
Are Y/C signals present on both sides of C01100(Y) and
C0168(C) ?
Is TDA15134E (D013) UOCV_DVCLK clock there
AND are the UOCV_DV(x) signals toggling?
are UOCV_DV(x) and UOCV_DVCLK signals arriving to
the CPLD (D080) (XC2C128-7TQG144C) ?
GOTO VIDEO PATH CHECK
on the remote control set up correctly ? ==> See operation manual and set "INPUT SOURCE" to "EXT3"
yes
yes
yes
yes
yes
yes
Check external connection, input setting, connector X011-1 and
peripheral circuits (termination R, ESD protection diode,...)
no
Check connectors X014 on side I/O PCB and X0208 on
Main PCB, check wiring between these connectors.
no
check C01100 and C0168, check peripherals on FRONT_Y_CVBS_IN
and FRONT_C_IN signals
no
(termination R, BLM,...)
TDA15134E (UOCV) (D013) is not functioning normal,
no check GTV SW and peripherals (power supply,xtal,...) of D013
check resistor networks on UOCV_DV signals
no
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