Toshiba 52XV645U Service Manual page 13

No or distorted
video
Does
NO
the back light function
normally when the unit
is turned on?
Troubleshoot for
backlight problelms.
YES
screen discolored
YES
or have streaks as
shown in the example or
are dark areas
present ?
This signal viewed from
the twisted cable pairs at
the LVDS connectors
while referencing cold
ground.
If the LCD Control
Board is available, try it.
If this does not help,
replace the LCD display
panel. ***
Is the
NO
the input button
is pressed on the
YES
receiver or remote, is
the on screen
display clear and
normal?
Replace
the Main
Module.
Check for LVDS activity at
CN651 and CN652. If it is present,
suspect a problem with the display
control board (Tcon). If it is not
present, replace the
main PCB.
When
NO
Using the
power distribution
diagram, are the voltages
YES
normal at pins 9, 10, and
11 of CN90 and pins
7 and 8 of
CN91?
SMART2009-LCD909-V5 Page 5 of 14
Examples
NO
Suspect the
power supply
module.