XOCECO LC27U7D, Service Manual

Page: 28 / 70

26
2. Raster, but no picture
Check if the unit button
and sensor control
operation?
Check if the all
channels have signal?
Replacing
CPU board
Enter factory-menu,
initialization EEPROM,
then turn off the TV,
turn on again, display
picture?
Adjust CPU board
again
Which is no
signal of
channels
Replacing
CPU board
Check if 1VPP signal
and noise wave of
X12 (PIN 1) in the
TV board?
Check if output
IF signal of
TUNER1 (pin
11) is normal?
Replacing
TUNER1
Check N101
no
yes
yes
HDMI/VGA/YPRP
TV
yes
no
no
no
yes
Does display OSD
menu in screen when
press submenu?
yes
no
yes