Viewsonic Corporation - ViewSonic PerfectFlat E90fB-4 Service Manual

6-1-2. ABNORMAL VIDEO LEVEL ON SCREEN
CHECK THE VOLTAGE OF IC801
PIN 10, 18 ABOUT 5V
OK
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
OK
CHECK IC801 PIN 23 CLAMP PULSE
OK
CHECK THE VIDEO OUTPUT OF IC801
PIN 19, 20, 21 ABOUT 4Vpp,
CONTRAST SET MAX.
OK
R.G.B. APPROACH STANDARD
6-1-3. ABNORMAL DDC (PLUG & PLAY)
CHECK IC101 PIN 16 VOLTAGE ABOUT 5V
OK
CHECK SIGNAL CABLE
OR H802 PIN 2, 4 DATA OUTPUT

ViewSonic Corporation

NG
NG
NG
NG
CHECK 5V RELATIVE CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK THE IC801 PIN 23
RELATIVE CIRCUIT
CHECK IC801 PIN19/PIN20/PIN21
RELATIVE CIRCUIT
CHECK IC902 GOOD OR FAIL
18
Confidential - Do Not Copy E90fB -4