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1.no raster and not sound
Turn off the set ,unplug
VGA cable,disconnect
power board(2) and
signal process
board,connect X709
pin8 to GND,set panel
to self-check status,turn
on the set again,check
whether the panel
lights up.
yes
Check
signal
abnormal
process board
power supply
normal
Disconnect
power board and
signal
board
abnormal
Replacing power
supply board
Check signal channel
connection status
ok
Replacing main board
normal
Replace
video process
board
Troubleshooting guide
Check if the red
indicator
yes
LED8004
onpower board
no
lights up
Check logic
board's
power supply
abnormal
process
Disconnect
power
and
process board
normal
Load short
circuit,replacing
singal processing
board
If power
indication
yes
lamp is lit
no
Replacing power
supply board
normal
normal
Screen
Cut off connect
problem
X2between main
board and video
processing,which
the board is
abnormity
board
normal
signal
Power open
abnormal
circuit
Replacing
power supply
board
23
no
Check 5V-STBY
abnormal
Cutoff the connection
between power board
and signal process,
check5V-STB
abnormal
Replacing
power supply
board
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