LG StudioWorks 520Si Owner's Manual page 27

NO CHARACTER
CHECK
IC301 PIN 8 (8V)?
YES
CHECK
IC301 PIN 2, 4, 6 ?
YES
CHECK
IC301 PIN 19 ?
YES
CHECK
IC301 PIN 11,
15, 18 ?
1.2v
YES
CHECK
VIDEO OUTPUT
Q302, Q312,
Q322 ?
YES
CHECK
R, G, B CATHODE
VOLTAGE ?
NORMAL=44~67V
YES
CHECK
IC301 PIN 9 ?
YES
TROUBLE IN
CDT SOCKET
2. NO CHARACTER
NO
NO
NO
NO
NO
VIDEO OUTPUT:
Q301~Q304,
Q311~Q314,
Q321~Q324
NO
NO
- 16 -
TROUBLE IN
IC302 12V LINE
TROUBLE IN
PC SIGNAL,
C311, C331, C351
TROUBLE IN
CLAMP CIRCUIT
TROUBLE IN
IC301 CIRCUIT
TROUBLE IN
IC301 CIRCUIT
TROUBLE IN
VR302, VR312, VR322
FOLLOW
NO CONTRAST
PROCEDURE