Daewoo 710B Service Manual page 19

3. A missing Color
0.7Vpp
One color is
missing
Is input signal
normal?
Yes
Is the
output of pre-amp
(IC801, KA2500)
pin 21, 24, 26 all
normal?
Yes
CRT
Cathode (Rk, Gk, Bk)
is normal?
RK, GK, BK
About 40V 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 IC803 waveform
normal?
Yes
Trouble in 80/120V DC
line
No
Trouble in 80/120V DC
line
17
Trouble in
No
video output
circuit, IC803
or ambient