LG Flatron 774FT Service Manual page 14

NO CHARACTER
CHECK
IC302 PIN 9 (5V) ?
YES
CHECK
IC302 PIN 5,6,7 ?
YES
CHECK
IC302 PIN 18,19,20 ?
YES
CHECK
IC303 PIN 4 (80V)
8 (12V) ?
YES
CHECK
IC303
PIN 1, 2, 3 ?
YES
CHECK
R, G, B CATHODE
VOLTAGE?
YES
TROUBLE IN
CRT SOCKET
2. NO CHARACTER
NO
NO
NO
NO
NO
NO
- 14 -
TROUBLE IN
P302 5V LINE
TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE
TROUBLE IN
IC302
TROUBLE IN
P302 12V LINE/80V LINE
TROUBLE IN IC303
TROUBLE IN
R341~R343,R331~R333,
L311~L313,D307~D315