Sharp LC-32WD1E/S/RU Service Manual page 41

LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
NO picture on display via EXT-2 Y/C input
No picture on LCD screen when EXT-2 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 signals arriving to pins 20B(Y) and 15B(C)
of SCART2 (X027-2) ?
is C signal arriving to video switch TDA8601 (D1302)
at pin 8 ?
are Y/C signals arriving to both sides of C0178(C) and C0169(Y) ?
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 "EXT2"
yes
yes
yes
yes
yes
yes
Check external connection, input setting, SCART2 and peripheral
no
check C1338 and check peripheral on SCART2_R_C signal
(termination R, ESD protection diode,...)
no
Check video switch TDA8601 (D1302) power supply (+8V_SW) and
peripherals, Check if SLCT_RGB_YPbPr is set correctly.
no Check C0169, check peripheral on SCART2_Y_CVBS_IN signal
(termination R, ESD protection diode,...)
TDA15134E (UOCV) (D013) is not functioning normal,
check GTV SW and peripherals (power supply,xtal,...) of D013
no
check resistor networks on UOCV_DV signals
no
6-10
circuits.