NO picture on display via tuner reception (analog TV)
No picture appears on LCD screen during tuner reception
Checklist:
1) Is "INPUT SOURCE" button on the remote control set up correctly ? ==> See operation manual and set "INPUT SOURCE" to "TV"
2) Is MENU-PICTURE-Contrast/Brightness set to "MIN" ? ==> Set it to appropriate level
3) Is ANT-CABLE disconnected or connected improperly? ==> Connect it correctly as per the operation manual
v
yes
Is level of tuner supply voltage (pin 7 of tuner U011) 5V ?
no
Check if D0911 (LD1117DT50) output (pin2) is 5V
IF yes, check if D0918 (MC34063A) output (pin2) is 6v6
IF yes, check +12V_DVB
v
yes
Is level of I2C lines (pins 4 and 5 of tuner U011) LOW ?
yes
These are I2c communication lines for tuner control.
Follow the path and check whether they are forced to LOW.
Check I2C switch D016
v
no
Is level of tuner AGC (pin2 of U011) 0V ?
yes
Check analog switch D0111 (74HCT1G66PW)
power supply (5V) and functionality
v
no
Is the video signal (IF) sent from pin8 of tuner (U011) ?
no
Check the tuner (U011) and peripheral circuits
v
yes
Is video signal sent from pins 4 and 5 of video SAW filter (Z011)
no
check video SAW filter and peripheral circuits
check SAW_SW signal
v
yes
Is TDA15134E (D013) UOCV_DVCLK clock there
AND are the UOCV_DV(x) signals toggling?
no
TDA15134E (UOCV) (D013) is not functioning normal,
check GTV SW and peripherals (power supply,xtal,…) of D013
v
yes
are UOCV_DV(x) and UOCV_DVCLK signals arriving to
the CPLD (D080) (XC2C128-7TQG144C) ?
no
check resistor networks on UOCV_DV signals
v
yes
GOTO VIDEO PATH CHECK
LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
6-4
