Iiyama Vision Master Pro 413 Service Manual page 18

2.ABNORMAL VIDEO LEVEL ON SCREEN
CHECK THE VOLTAGE OF IC801
CHECK THE VOLTAGE OF IC801
PIN 7,15,18,21 ABOUT 12V
PIN 6, 9, 22 ABOUT 12V
NG
OK
CHECK THE SIGNAL INPUT OF R.G.B.
ABOUT 0.7Vpp
OK
CHECK IC801 PIN5 CLAMP PULSE
CHECK IC801 PIN 15 CLAMP PULSE
PIN 11 BLANK PULSH
PIN 16 BLANK PULSE
NG
OK
CHECK THE VIDEO OUTPUT OF
CHECK THE VIDEO OUTPUT OF IC801
IC801 PIN 16,19,22 ABOUT 4Vpp.,
PIN 18, 20, 23 ABOUT 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
OR IC401 PIN 16 OUTPUT
.!27!.
CHECK 12V RELATIVE
CIRCUIT
CHECK SIGNAL CABLE OR
INTERFACE CARD.
CHECK IC401 PIN 16 OUTPUT
CHECK THE IC105 RELATIVE CIRCUIT
CHECK IC801 PIN 13 ABOUT 4V
CHECK IC801 PIN 24
PIN 26, 27, 28 ABOUT 4V OR
CHECK Q801 AND RELATIVE CKT
CHECK Q102 GOOD OR FAIL