Toshiba 52XV645U Service Manual page 12

Does
the secondary
12 volt source appear
Yes
at pins 9, 10, and 11 of
CN90 when the on/off
button is
pressed?
Does a blink code
Yes
appear when the unit is
turned on?
power supply problems and bus line problems
No
Suspect a
problem with the
Main module.
Yes
No
Suspect a problem with
the power supply module.
Use the blink code chart to help diagnose the
problem. Over voltage( Mode 20) indicates
(Mode 19) indicates a defective main module.
Yes
at pin13 of CN90 on the
main module when AC is
Does
a 3.3 volt DC
No
level appear at pin 2
of CN91 when the on/
off button is
pressed?
Is a
power protect
No
level (3.2 VDC)
present at pin 1 of
CN91 when AC
is applied?
Dead Set No
Sound/ No
Picture
Is
5 VDC present
No
applied?
Suspect a problem with
the power supply module.
Yes
Detect) appear at pin
3 of CN91 when
Suspect a problem
with the SYSCON
circuit located on the
SMART2009-LCD909-V5 Page 4 of 14
No
Does
3.2 volts (AC
power is
pressed?
Yes
Main module.