Acer 41AS551V AC511 Service Manual - Page 15

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Acer 41AS551V AC511 Service Manual
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1.NO SIGNAL ON SCREEN
CHECK VIDEO IC801 VCC ABOUT 8V
NG
OK
CHECK THE OUTPUT VOLTAGE
OF IC801 PIN 13, 15, 18 ABOUT 3Vpp
NG
OK
CHECK THE B+ VOLTAGE OF
VIDEO PCB ABOUT 80V
NG
OK
CHECK THE VOLTAGE OF CRT
CATHODE ABOUT 40Vpp
NG
OK
CHECK THE VOLTAGE OF FBT SCREEN
ABOUT 400V TO 700V
LESS THAN 400V
EXCEED 700V

6-2 ABNORMAL DISPLAY

CHECK THE 80V RELATIVE CIRCUIT
CHECK FBT & CRT RELATIVE CIRCUIT
OR REFER ITEM 6-1
14
CHECK THE 12V PIN
OF P802 CONNECTOR
CHECK THE RELATIVE CIRCUIT
OF IC801 PIN 2/PIN 16 Vcc CIRCUIT
OF SMPS ON MAIN PCB
CHECK THE IC802
RELATIVE CIRCUIT
CHECK FBT RELATIVE CIRCUIT