Toshiba 47HL167 Service Manual page 12

No or distorted
video
Does
NO
the back light function
normally when the unit
is turned on?
Analog
Using
the power
NO
distribution diagram,
are the voltages normal
at P811A and
P811B?
Suspect the
Low B
module.
YES
Is
the screen discolored
YES
or does it have streaks
or dark areas with no
signal input?
Is the problem
Digital
associated with an
analog or digital
input?
YES
Suspect the AV tuning module.
This can be confirmed by using the
wiring interconnect diagram and
checking the Y, Pb, Pr signals at
plug CN72A.
Replace the
LCD display
panel.
NO
YES
Is the on screen display
normal?
YES
Suspect the
Seine (Digital)
module.
11
Examples
NO
Using the
power distribution
NO
diagram, are the
voltages normal at
CN90B and
CN91B?
Suspect the
Low B
module.