![background image](http://html1.mh-extra.com/html/viewsonic/g90f-b-3/g90f-b-3_service-manual_1020355047.webp)
3.
The raster don’t appear
﹒
The raster don't appear
Is the C425 = -200V
normal?
Does the CRT heater
glow red?
Does the entire screen
light up?
Turn the FBT screen
clockwise
FBT is defective
R457, D420 are
defective
Is the voltage at the
pin10 of CRT
normal?
D206,Q208, R226 are
defective
Heater voltage
approx. 6.3V
Q420, Q419, IC301
Mute control are
defective
No
Yes
Yes
No
Yes
No
No
44
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
G90f/B-3
Summary of Contents for G90f/B-3
Page 26: ...Waveform 1 2 3 4 5 6 23 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 27: ...7 8 8 10 11 12 24 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 28: ...13 14 14 16 17 18 25 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 29: ...19 20 20 22 23 24 26 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 30: ...25 26 26 28 29 30 27 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 31: ...30 32 33 34 34 36 28 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 32: ...37 38 39 40 40 42 29 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 33: ...43 44 45 46 46 48 30 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 34: ...49 50 51 52 53 54 31 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 35: ...55 56 32 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 40: ...C PCB defined Main board 37 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 88: ...85 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 89: ...86 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 90: ...87 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 91: ...88 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 92: ...89 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 93: ...90 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 94: ...91 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 95: ...92 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 96: ...93 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 97: ...94 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 98: ...95 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 99: ...96 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 100: ...97 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 101: ...98 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 102: ...9 Block Diagram 99 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 103: ...10 Schematic Diagrams 100 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 104: ...101 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 105: ...102 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 106: ...103 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 107: ...104 ViewSonic Corporation Confidential Do Not Copy G90f B 3...
Page 108: ...11 PCB Layout Diagrams 105 ViewSonic Corporation Confidential Do Not Copy G90f B 3...