TROUBLESHOOTING HINTS
1. No Character
No Character
Are the Contrast &Change the Contrast &
No
Brightness Controls in Brightness control value to
OSD menu maximum
maximum?
Yes
Is wholeNo
Refer to
screen bright?No Raster
No Raster
Yes
Is CRT
Yes
Cathode (Rk, Gk, Bk)Check the peripheral circuit
signal levelof CRT
normal?Rk, Gk, Bk
NoAbout 30~35Vpp
Is the
output signal of the
YesCheck the video output
(pin 14, 16, 18) pre-amp
circuit and its ambient circuit
IC801, normal?
No
Is 12V lineNoTrouble in 12V line
normal?of the Main PWB
Yes
Is blanking No
Check the clamping pulse
pulse (pin 20 of IC801)
circuit
normal?
5Vp-p
Yes
Is input signalNo
Check the signal cable
normal?
Yes
Trouble in IC801 and
its ambient circuit
15 |