AOC C787 Service Manual page 17

2.ABNORMAL VIDEO LEVEL ON SCREEN
CHECK THE VOLTAGE OF IC801
PIN 6, 9, 22 ABOUT 12V
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
CHECK IC801 PIN 15 CLAMP PULSE
PIN 16 BLANK PULSE
CHECK THE VIDEO OUTPUT OF IC801
PIN 18, 20, 23 ABOUT 4Vpp,
CONTRAST SET MAX.
R.G.B. APPROACH STANDARD
3. ABNORMAL DDC (PLUG & PLAY)
CHECK IC101 PIN 5 VOLTAGE ABOUT 5V
CHECK SIGNAL CABLE
OR H802 PIN 3, 4 DATA OUTPUT
NG
OK
OK
NG
OK
NG
OK
NG
OK
CHECK 12V RELATIVE
CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK THE IC105 RELATIVE CIRCUIT
OR IC401 PIN 16 OUTPUT
CHECK IC801 PIN 13 ABOUT 4V
PIN 26, 27, 28 ABOUT 4V OR
CHECK Q801 AND RELATIVE CKT
CHECK Q102 GOOD OR FAIL


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