ViewSonic E95 - Page 69

6. One Color missing
turn up the screen control
and check whether the raster
appear.
_ ViewSonic Corporation
No video display
Does the entire screen no
light up?
Yes
Are the input
waveform at P601V
normal?
Yes
Are the waveform at
the pin35, pin32,
pin29 of IC601?
Yes
Are the waveform of
the terminal
BK,RK,GK orf CRT
socket normal?
Yes
Are the voltage on
heater G1,G2 of
X601 normal?
Yes
The CRT is defective.
66
no
no
no
no
Video output circuit IC602
defective
BK: D614, D615, Q604,
Q605
RK: D618, D620, Q606,
Q607
GK: D621, D622, Q608,
Q609
The horizontal deflection
circuit is defeat
The raster don't appear
Check the signal cable or
computer
1C601 its buffer or its
drive circuit. (bright
control,contrast
control,clamping
pulse,blanking pulse) is
defective
CRT drive circuit is
defective heater: power
supply circuit, G1 & G2,
T401
ee