Service manual

18
3. A missing Color
Is input signal
normal?
One color is
missing
Is CRT
Cathode (Rk, Gk, Bk)
normal?
Is video
output IC803 waveform
normal?
Each grid (G1, G2)
voltage normal?
Is the
output of pre-amp
(IC802, M52742ASP)
pin 29, 32, 35 all
normal?
Check video signal
cable or video card.
Trouble in IC802 or its
ambient circuit.
Trouble in
video output
circuit, IC803
or ambient.
Trouble in 80Vdc
line.
Trouble in G1 line
and G2 line
Replace CRT
No
No
No No
No
Yes
Yes Yes
Yes
Yes
Rk, Gk, Bk
About 45Vpp
0.7Vpp