Toshiba 42HL67 - 42" LCD TV - Second Level Troubleshooting: Dead Set; Power Supply and Voltage Checks

Are
any problem
LED indications
exhibited after the
power button is
pressed?
No Yes
Does
3VDC appear at pin 3
of P806A when on-off is
pressed?
No
Yes
Is
5VDC present at pin 1
of P806A when the unit
is plugged in?
No
Is
18 VDC present at pin 7
of P806A when the unit
is plugged in?
No
Yes
Suspect the
Low B supply
circuit.
Is
5VDC present at pin 13
of P811A with the unit
plugged in?
No
Yes
Suspect the Low B
supply, then the main
power supply circuit.
Suspect the
system
control
(SYSCON)
circuit.
Yes
Use
the LED blink
chart to help
locate the
problem.
Suspect the
main power
supply circuit.
Dead set – No
sound or picture
10
10