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
Summary of Contents for 103FH
Page 35: ...33 PCB LAYOUT Main PCB Component Side...
Page 36: ...34 Main PCB Solder Side...
Page 37: ...35 Video PCB Component Side...
Page 38: ...36 Video PCB Solder Side...
Page 39: ...37 Control PCB Component Side Control PCB Solder Side...
Page 40: ...38 Socket PCB Component Side Socket PCB Solder Side...
Page 41: ...39 SCHEMATIC DIAGRAM Power PFC Circuit...
Page 42: ...40 MCU OSD Key Deflection Dynamic Circuit...
Page 43: ...41 Deflection H V Circuit...
Page 44: ...42 Video Vertical Convergence Tilt Circuit...
