ViewSonic VX800-3 Service Manual - Page 46
No Display on Screen Screen is black, LED is off
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4.2 No Display on Screen (Screen is black, LED is off) Is screen black? YES NO Check that C202 positive is at 5V. (FIG 2.) YES NO CChheecckkCN301 pin1 is12V, pin5 is 5V IC100 failure Check that the voltage level of CN100 is approximately 12V YES FB100, FB101 failure NO F100 or power board failure YES Inverter failure NO Check IC400 Pin 114 failures ViewSonic Corporation 52! Confidential - Do Not Copy VX800-3
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4.2 No Display on Screen (Screen is black, LED is off)
-
Is screen black?
Check that C202 positive is at 5V. (FIG 2.)
Check that the voltage level of CN100 is
approximately 12V
Check CN301 pin1
is12V, pin5 is 5V
IC100 failure
FB100, FB101
failure
F100 or power board failure
YES
NO
YES
NO
YES
NO
Inverter failure
Check IC400
Pin 114 failures
YES
NO
ViewSonic Corporation
Confidential – Do Not Copy
VX
8
00-3