ViewSonic E95 - Page 68

Video is defective
Turn up the screen control
and check whether the raster
appear.
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ViewSonic Corporation
No video display
Does the entire screen
light up?
Yes
Are the input waveform
at P601 pin1, pin3, piinsS
normal?
Yes
Are the waveform at the
pin35, pin32, pin29 of
1C601?
Yes
Are the waveform of the
terminal BK,RK,GK of
CRT socket normal?
Yes
Are the voltage on
heater, G1,G2 of CRT
socket normal?
Yes
The CRT is defective.
65
No
No
The raster don't appear.
Check the signal cable or
computer
1C601 its buffer or its drive
circuit. (clamping pulse,blanking
pulse, is defective)
Video optput circuit defective
1C603 pin1, pin2, pin3
CRT drive circuit is defective
heater, power supply circuit
D203, G1, G2, FBT, D427,
Q611, Q612, Q613, Q633, Q440
and its drive circuit
FSA
RRS
See
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