LG StudioWorks 520Si Owner's Manual page 28

NO RASTER
CHECK
CDT HEATER VOLTAGE?
(6.3 ± 0.6V)
YES
CHECK
CDT G1 (0 ~ - 60V)?
YES
CHECK
R, G, B CATHODE
OF CDT?
YES
CHECK
FBT PIN 3
DC 62~116V?
YES
CHECK
FBT PIN 2 ?
1.000
~1.200VP-P
YES
CHECK MUTE OR DPM
CIRCUIT
3. NO RASTER
(LED COLOR IS GREEN)
NO
NO
NO
NO
NO
- 17 -
TROUBLE IN
HEATER VOLTAGE
SUPPLY CIRCUIT
( Q904, Q905, Q914)
TROUBLE IN
G1 SUPPLY CIRCUIT
(D508, C636, Q509,
Q510, ZD501 etc)
FOLLOW
NO CHARACTER
PROCEDURE
FOLLOW
NO POWER
PROCEDURE
CHECK HORIZONTAL
DEFLECTION CIRCUIT