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Troubleshooting flow chart
1. No raster, no picture, no sound.
Press button POWER of remote control or unit to
turn on the TV set, then check if C333(5V) are
normal or not?
Yes
Is the voltage of
X301-6#
on
main
board high level?
Yes
Check
backlight
board
Yes
Is the voltage of R324
No
No
on main board high
level?
Check
N101and
its
power circuits
No raster, no picture, no sound
Does power indicator light up?
No
Yes
Check
N301and
its
power circuits
No
Check 12V_STB
Disconnect power
board from data
processing board, then
test 12V_STB again.
Yes
Check
main
board
N303and
its power circuits
No
Check power
board
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