LG Flatron 775FT Service Manual page 13

NO CHARACTER
CHECK
IC302
PIN 9(5V) ?
YES
CHECK
IC302 PIN 5, 6, 7?
YES
CHECK
IC302 PIN 20, 19, 18 ?
YES
CHECK
IC303 PIN 4 (80V)
PIN 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
TROUBLE IN
P302 5V LINE
TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE
TROUBLE IN
IC302
TROUBLE IN
P303 12V LINE/
80V LINE
TROUBLE IN IC303
TROUBLE IN
R341~R343,
R331~R333, L311~L313,
D307~D312