Acer AF715 Series Service Manual page 17

2.ABNORMAL VIDEO LEVEL ON SCREEN
HECK THE VOLTAGE OF IC801
CHECK THE VOLTAGE OF IC801
PIN7,15,18,21
PIN 6, 9, 22 ABOUT 12V
NG
OK
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
OK
CHECK IC801 PIN5
CHECK IC801 PIN 15 CLAMP PULSE
CLAMP PULSE PI
PIN 16 BLANK PULSE
11 BLANK PULSE
NG
OK
CHECK THE VIDEO OUTPUT OF
CHECK THE VIDEO OUTPUT OF IC801
IC801 PIN16,19,22 ABOUT
PIN 18, 20, 23 ABOUT 4Vpp,
4Vpp,CONTRAST SET MAX.
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 3, 4 DATA OUTPUT
CHECK 12V RELATIVE
CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK THE IC105 RELATIVE CIRCUIT
IC401 PIN16 OUTPUT
OR IC401 PIN 16 OUTPUT
CHECK IC801 PIN 13 ABOUT 4V
PIN 26, 27, 28 ABOUT 4V OR
CHECK IC801 PIN24 ABOUT
CHECK Q801 AND RELATIVE CKT
CHECK Q102 GOOD OR FAIL
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