ViewSonic E96f+SB-1, Service Manual, Page: 22 / 59

6-3. ABNORMAL VIDEO LEVEL ON SCREEN
6-4. NO SIGNAL ON SCREEN
CHECK THE VOLTAGE AT PIN10/14/17/22
OF IC801 ABOUT 5V
CHECK 5V SUPPLY CIRCUIT
CHECK THE SIGNAL OUT ABOUT 0.7VP-P
CHECK SIGNAL CABLE OR
INTERFACE CARD
CHECK THE CLAMP PULSE OF IC801 PIN27
CHECK THE RELATIVE CIRCUIT OF
IC801 PIN27
CHECK THE VOLTAGE OF IC801 PIN23/24/25
ABOUT 4VP-P CHECK THE RELATIVE CIRCUIT OF
IC801 PIN23/25/24 OR THE IC801
FAIL
CHECK THE RELATIVE CIRCUIT OF IC802
OK
OK
OK
OK
NG
NG
NG
NG
NG
CHECK THE VOLTAGE AT PIN10/14/17/22
OF IC801 ABOUT 5V
CHECK 5V SUPPLY CIRCUIT
CHECK THE VOLTAGE OF IC801
PIN23/24/25 ABOUT 4VP-P
CHECK THE RELATIVE CIRCUIT OF
IC801 PIN23/25/24 OR THE IC801
FAIL
CHECK THE VOLTAGE OF IC802 PIN12
ABOUT 83V AND IC802 PIN2 ABOUT 12V CHECK THE 83V&12V SUPPLY
CIRCUIT OR MAIN BOARD
CHECK THE VOLTAGE OF CRT CATHODE
ABOUT 50VP-P CHECK THE RELATIVE CIRCUIT OF
IC802 OUT PUT
CHECK THE VOLTAGE GO G2 ABOUT
550V~650V
CHECK FBT RELATIVE CIRCUIT
OK
OK
OK
OK
NG
NG
NG
NG
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