16
6-2 ABNORMAL DISPLAY
1.NO SIGNAL ON SCREEN
CHECK FBT RELATIVE
CIRCUIT
LESS THAN 400V
OK
NG
NG
OK
OK
NG
OK
NG
CHECK THE OUTPUT VOLTAGE
CHECK THE B+ VOLTAGE OF
CHECK THE VOLTAGE OF CRT
CATHODE ABOUT 40Vpp
CHECK THE VOLTAGE OF FBT SCREEN
CHECK THE RELATIVE CIRCUIT
CHECK THE 12V PIN
OF SMPS ON MAIN PCB
RELATIVE CIRCUIT
OF P802 CONNECTOR
ABOUT 400V TO 700V
EXCEED 700V
OF IC801
CHECK FBT & CRT RELATIVE CIRCUIT
OR REFER ITEM 7-1
VIDEO PCB ABOUT 80V
CHECK THE 80V RELATIVE CIRCUIT
CHECK VIDEO IC801 VCC ABOUT 12V
OF IC801 PIN 18, 20, 23 ABOUT 3Vpp
CHECKTHE VQ802 ~ Q807
16,19,22
Check IC803 Pin1,2,3
ABOUT 40V
Summary of Contents for EX951F
Page 23: ...22 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY ...
Page 46: ...45 9 IC BLOCK DIAGRAM IC101 NT68F65U IC102 24C08 IC901 STR G9656D ...
Page 47: ...46 IC401 UPC1888ECT ...
Page 48: ...47 IC804 NT6828 00046 IC801 LM 1269NA ...
Page 49: ...48 IC803 LM2480NA IC904 PC431CLP IC903 L7812CV ...