ViewSonic E70F Service Manual - Page 45

D206, G1, G2, FBT, IC603

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5. Video is defective. Turn up the screen control and check whether the raster appear. 0.7Vp-p 3Vp-p 72Vp-p Heater: 6.3VDC G1: -65V G2: 550V No video display Does the entire screen light up? Yes No The raster don't appear. Are the input waveform at P601 pin1, pin3, pin5 normal? No Check the signal cable or computer Yes Are the waveform at the pin18, pin19, pin20 of IC601? No IC601 its buffer or its drive circuit. (clamping pulse,blanking pulse, is defective) Yes Are the waveform of the No terminal BK,RK,GK of CRT socket normal? Video optput circuit defective IC602 pin1, pin2, pin3 Yes Are the voltage on heater, No G1,G2 of CRT socket normal? CRT drive circuit is defective heater, power supply circuit D206, G1, G2, FBT, IC603 and its drive circuit Yes The CRT is defective. ViewSonic Corporation Confidential - Do Not Copy E70f+SB-3 42

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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
Co
nfidential - Do Not Copy
70f+SB-3
E