Abnormal Display; Blanking - Tatung VM9G5DA S995T Service Manual

CHECK VIDEO IC801 VCC ABOUT 12V
NG
OK
CHECK THE OUTPUT VOLTAGE
OF IC701 PIN 18, 20, 23 ABOUT 3Vpp
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
OF SMPS ON MAIN PCB
CHECK THE RELATIVE
CIRCUIT OF BLANKING
NO H.
CHECK IC801 Pin16 on Video PCB
CHECK G1 RELATIVE CIRCUIT
Q705, Q718,C707 ON MAIN PCB.

6-2 ABNORMAL DISPLAY

NO SIGNAL ON SCREEN
NG
LESS THAN 400V
EXCEED 800V
6-3 NO BLANKING
NO V.
CHECK THE PIN 2
OF P802 CONNECTOR = 12V
CHECK THE RELATIVE CIRCUIT
OF IC801
CHECK THE 80V RELATIVE CIRCUIT
OF SMPS ON MAIN PCB
CHECK THE R.G.B OUTPUT
RELATIVE CIRCUIT
CHECK FBT RELATIVE CIRCUIT
CHECK FBT & CRT RELATIVE
CIRCUIT
CHECK THE RELATIVE CIRCUIT
OF C433,D410,R635,R636,IC105
ON MAIN PCB