Sanyo LCD-26XR7 Service Manual page 20

3.2. Raster, but no picture
Check if the unit button
and remote control
operation?
no
Replace
main board
Does display
yes
menu in screen when
press menu button?
no
Enter factory-menu,
initialization EEPROM,
then turn off the TV,
turn on again, display
picture?
yes
Adjust main board
again
Check TUNER401
and its periphery
yes
OSD
Check
yes
channels have signal?
Which is no signal
of channels
Check if 1VPP signal
yes
and noise wave of
X405(PIN 8) in the
TV board?
Check if output
no
IF signal
TUNER401(pin
11) is normal?
Check N404 and
its periphery
18
if the all
no
HDMI/VGA/YPRPB
TV
Replace
main board
no
of
yes