3. A Missing Color
One color is
missing
No
Is input signalCheck video signal
normal?cable or video card.
0.7Vpp
Yes
Is the
output of pre-amp
No
(IC801, KA2500)Trouble in IC801 or its
ambient circuit
pin 21, 24, 26 all
normal?
Yes
CRTIs videoTrouble in
NoNo
Cathode (Rk, Gk, Bk)output IC803 waveformvideo output
is normal?RK, GK, BKnormal?circuit, IC803
About 40V p-por ambient
YesYes
Each grid (G1, G2)
Trouble in 80Vdc line
voltage normal?
Yes
No
Trouble in 80Vdc line
Replace CRT
17 |