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3. A missing Color
Is input signal
normal?
One color is
missing
CRT
Cathode (Rk, Gk, Bk)
is normal?
Is video
output IC803 waveform
normal?
Each grid (G1, G2)
voltage normal?
Is the
output of pre-amp
(IC801, KA2500)
pin 21, 24, 26 all
normal?
Check video signal
cable or video card.
Trouble in IC801 or its
ambient circuit
Trouble in
video output
circuit, IC803
or ambient
Trouble in 80/120V DC
line
Trouble in 80/120V DC
line
Replace CRT
No
No
No No
No
Yes
Yes Yes
Yes
Yes
RK, GK, BK
About 40V p-p
0.7Vpp