Toshiba 37AV502U Service Manual page 10

Does
the secondary
Yes
12 volt source appear
at pin 8 of P802 when
the on/off button is
pressed?
Suspect a
problem with the
Main module.
Does
a 4.3 volt on off
Yes
signal appear at pin
13 of P802 when the
on/off button is
pressed?
No
Suspect a problem with
the power supply module.
Dead Set No
Sound/ No
Picture
Is
5 VDC present
Yes
at pins 10, 11, and 12 of
P802 on the power supply
module when AC is
applied?
No
Is the
Power Good
(AC Detect) level
No
less than .07V at pin
14 of P802
when AC is
applied?
9
No
Suspect a problem with
the standby 5 volt supply
on the power supply supply
module.
Suspect a problem
Yes
with the SYSCON
circuit located on the
Main module.