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2. Trouble in Power on
No
No
Yes
Yes
Is 5VS line
normal(pin 8 of CN2)?
Trouble in U6 & Q5
and its ambient circuit.
Check the power board
(5VS of CN2A).
Check on Scaler(U1).
Is the
Power LED toggled
between on and
off?
Off
No
Yes
On
Is the power
cord well
connected?
Refer to No video
or No raster.
Check if the power switch
is on position and
Connect the power
cord correctly.
Check the
waveform of pin 7
of -com.