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3. A Missing Color
0.7Vpp
Cathode (Rk, Gk, Bk)
One color is
missing
Is input signal
normal?
Yes
Is the
output of
pre-amp IC801
pin 14,16,19 all
normal?
Yes
CRT
is normal?
RK, GK, BK
About 45V p-p
Yes
Each grid (G1, G2)
voltage normal?
Yes
Replace CRT
No
Check video signal
cable or video card
No
Trouble in IC801 or its
ambient circuit
Is video
No
output Q801, Q831, Q861
waveform normal?
Yes
Trouble in 65/8Vdc
line
No
Trouble in G1 line and
G2 line
17
Trouble in
No
video output
circuit,
Q803, Q804
Q833, Q834
Q863, Q864
or ambient
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