Insignia NS-46L240A13 - Troubleshooting Common Issues; No Sound or Picture Diagnosis

Supply with main
power, check if red
indicator light is
bright in standby
mode?
Check 5V inputted to
X604-PIN8 on main
board .
Check STANDBY
circuits on power
board.
Check backlight
board assembly.
Press key POWER on
remote control or key
board to turn on the TV set,
check if indicator light is
twinkling?
Check power board
assembly.
Check if the voltage of
X604-PIN6 on main board
is high level?
Check if the voltage
of X604-PIN10 on
main board is high
level?
N
Y
1、No sound, no picture.
N
N
Y
Y
Y
Check N610 and its
peripheral circuits.
N
Check 24V on power
board.
N
Y
Check power board
assembly.
N
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