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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 IC802
waveform normal?
Each grid (G1, G2)
voltage normal?
Is the
output of pre-amp
(IC801,TDA9210)
pin 14, 16,18 all
normal?
Check video signal
cable or video card.
Trouble in IC801 or its
ambient circuit
Trouble in
video output
IC802
or ambient
Trouble in 100Vdc
line
Trouble in G1,G2 line
Replace CRT
No
No
No No
No
Yes
Yes
Yes
Yes
Yes
RK, GK, BK
About 40V p-p
0.7Vpp