ViewSonic E70FSB-2 Service Manual - Page 20
Abnormal Video Level On Screen, Abnormal Ddc Plug & Play
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1.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 10 ABOUT 5V NG OK CHECK THE SIGNAL INPUT OF ABOUT 0.7Vpp OK CHECK IC801 PIN 23 CLAMP NG OK CHECK THE VIDEO OUTPUT OF PIN 19, 20, 21 ABOUT CONTRAST SET NG OK R.G.B. APPROACH CHECK 5V RELATIVE CHECK SIGNAL CABLE INTERFACE CARD. CHECK THE IC801 PIN RELATIVE CIRCUIT CHECK IC801 PIN 5/PIN 6/PIN 7 & PIN RELATIVE CIRCUIT 2. ABNORMAL DDC (PLUG & PLAY) CHCEHCECKKICIC110011 PPIN 55VVOOLLTTAAGGE EABAOBUOTU5TV 5V NG OK CHECK SIGNAL CABLE OR H802 PIN 2, 3 DATA OUTOPUUTTPUT CHECK Q921 GOOD OR FAIL ViewSonic Corporation 17 Confidential - Do Not Copy E70f-5_E70fB-5_E70fSB-5
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1.ABNORMAL VIDEO LEVEL ON SCREEN
OK
NG
OK
NG
NG
OK
OK
CHECK THE VOLTAGE OF IC801
CHECK THE SIGNAL INPUT OF
ABOUT 0.7Vpp
CHECK THE VIDEO OUTPUT OF
R.G.B. APPROACH
CHECK SIGNAL CABLE
INTERFACE CARD.
CONTRAST SET
PIN 10 ABOUT 5V
CHECK 5V RELATIVE
CHECK THE IC801 PIN
RELATIVE CIRCUIT
RELATIVE CIRCUIT
CHECK IC801 PIN 23 CLAMP
PIN 19, 20, 21 ABOUT
CHECK IC801 PIN 5/PIN 6/PIN 7 & PIN
2. ABNORMAL DDC (PLUG & PLAY)
OK
NG
CHECK SIGNAL CABLE
CHECK Q921 GOOD OR FAIL
OR H802 PIN 2, 3 DATA OUTPUT
CHECK IC101 PIN 5 VOLTAGE ABOUT
5V
OUTPUT
ViewSonic Corporation
Confidential – Do Not Copy
E70f-5_E70fB-5_E70fSB-5
17