Acer AC511 SERIES Service Manual page 14

2.ABNORMAL VIDEO LEVEL ON SCREEN
CHECK THE VOLTAGE OF IC801
PIN 2, 16 ABOUT 8V
NG
OK
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
OK
CHECK IC801 PIN 11 CLAMP PULSE
NG
OK
CHECK THE VIDEO OUTPUT OF IC801
PIN 13, 15, 18 ABOUT 4Vpp,
CONTRAST SET MAX.
NG
OK
R.G.B. APPROACH STANDARD
3. ABNORMAL DDC (PLUG & PLAY)
CHECK IC101 PIN 5 VOLTAGE ABOUT 5V
NG
OK
CHECK SIGNAL CABLE
OR H802 PIN 2, 3 DATA OUTPUT
CHECK 8V RELATIVE CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK THE IC801 PIN 11
RELATIVE CIRCUIT
CHECK IC801 PIN 3/PIN 5/PIN 8 & PIN 10
RELATIVE CIRCUIT
CHECK Q921 GOOD OR FAIL
13