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TROUBLESHOOTING HINTS
1. No Character
No Character
Are the Contrast &
Brightness Controls in
OSD menu
maximum?
Yes
Is whole
screen bright?
Yes
Is CRT
Cathode (Rk, Gk, Bk)
signal level
normal?
No
Is the
output signal of the
(pin 14, 16, 18) pre-amp
IC801, normal?
No
Is 12V line
normal?
Yes
Is blanking
pulse (pin 20 of IC801)
normal?
Yes
Is input signal
normal?
Yes
Trouble in IC801 and
its ambient circuit
Change the Contrast &
No
Brightness control value to
maximum
No
No Raster
Yes
Check the peripheral circuit
of CRT
Rk, Gk, Bk
About 30~35Vpp
Yes
Check the video output
circuit and its ambient circuit
No
Trouble in 12V line
of the Main PWB
No
Check the clamping pulse
circuit
5Vp-p
No
Check the signal cable
15
Refer to
No Raster
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