ViewSonic E70F - 17" CRT Display User Manual

5. Video is defective.
No video display
Does the entire screen
light up?
Are the voltage on heater,
G1,G2 of CRT socket
normal?
Are the waveform of the
terminal BK,RK,GK of
CRT socket normal?
Are the waveform at the
pin18, pin19, pin20 of
IC601?
Are the input waveform
at P601 pin1, pin3, pin5
normal?
The CRT is defective.
The raster don't appear.
Check the signal cable or
computer
IC601 its buffer or its drive
circuit. (clamping pulse,blanking
pulse, is defective)
Video optput circuit defective
IC602 pin1, pin2, pin3
CRT drive circuit is defective
heater, power supply circuit
D206, G1, G2, FBT, IC603 and
its drive circuit
Turn up the screen control
and check whether the raster
appear.
0.7Vp-p
Heater: 6.3VDC
G1: -65V
G2: 550V
Yes
Yes
No
No
No
No
Yes
Yes
No
Yes
3Vp-p
72Vp-p
42
ViewSonic Corporation Confidential
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ViewSonic E70F - 17" CRT Display Specifications

General

Brand	ViewSonic
Model	E70F - 17" CRT Display
Category	Monitor
Language	English