Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor 1468 CH480_5
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TROUBLE SHOOTING GUIDE
1 . NO POWER Circuits Checked:
Power input
Protection Circuit
NO POWER Secondary B+ line short
DPM Circuit
TROUBLE IN
CHECK NO POWER CORD or
AC SOCKET? AC SOCKET SOLDER
CHECK NO TROUBLE IN FUSE
FUSE OK? F901, 3.15A/250V
CHECK NO TROUBLE IN
C904 (DCV)? D901 or R903
DCV = 140~370V
CHECK NO TROUBLE IN
IC901 OK? IC901(STR5717)
CHECK NO TROUBLE IN
Q921, Q922, Q921, Q922, R999
R999
CHECK TROUBLE IN
SMPS TRANSFORMER NO SMPS SECONDARY
SECONDARY B+ LINE SHORT
CIRCUIT
TROUBLE IN
PRIMARY OTHER
COMPONENTS
- 14 -
2. NO CHARACTER
Circuits Checked:
Video Circuit and its related
circuits.
NO CHARACTER
CHECK TROUBLE IN
NO
IC301 PIN 2, 4, 6 R/G/B SIGNAL,
SIGNAL LEVEL SIGNAL CABLE
CHECK
NO TROUBLE IN
IC201 PIN 16, 28
IC301 OR PIN 9, 10
SIGNAL LEVEL
CLAMP PULSE
CHECK NO TROUBLE IN
Q301 ~ Q309 Q301 ~ Q309
CHECK TROUBLE IN
NO
CATHODE VIDEO PERIPHERAL CIRCUIT
LEVEL OF CPT PCB
TROUBLE IN
VIDEO OUTPUT CLAMP
CIRCUIT (Q310)
- 15 -
3. NO RASTER
Circuits Checked:
High voltage generating
NO RASTER circuit.
CHECK NO TROUBLE IN
SIGNAL CABLE SIGNAL CABLE
CHECK TROUBLE IN
NO
IC701 PIN 1 VOLTAGE 12V LINE, IC202, IC701,
ABOUT 12V Q910
CHECK
IC701 PIN 3
HOR. SQUARE PULSE NO TROUBLE IN
(FREQUENCY ABOUT IC701
31.5KHz/35KHz/
38KHz/48KHz)
CHECK
FBT PIN 2 B+ NO TROUBLE IN
31.5KHz=93V Q901 Q905
48KHz=150V
CHECK TROUBLE IN
Q706 COLLECTOR Q706, C719, C718, D708, D709,
NO
FLYBACK PULSE FBT, DEFLECTION YOKE,
VOLTAGE ABOUT FBT B+ LINE
1100Vp-p AT 31KHz Q905, Q911, Q914, IC202
CHECK
CDT HEATER NO TROUBLE IN
VOLTAGE ABOUT 6.3V LINE
6.3V
TROUBLE IN
G2 VOLTAGE
- 16 -
4. TROUBLE IN H.V SYNC
Circuits Checked:
H.V-sync input circuit
Mode Control Circuit(IC201)
TROUBLE IN H.V-Deflection IC(IC601,701)
HOR. OR VER. SYNC Sync input circuit.
CHECK
NO TROUBLE IN
CONNECTOR
P201 PIN 2, 4 SIGNAL CABLE
SIGNAL
CHECK NO TROUBLE IN
IC701 PIN 9, 10
IC202, Q401, Q402
SYNC?
TROUBLE IN
IC701 OR OTHER
COMPONENTS
- 17 -
5. TROUBLE IN DPM
SUSPEND/STAND-BY/OFF MODE
LED NO AMBER
CHECK
IC202 PIN 16 NO TROUBLE IN
ABOUT IC202
0V
CHECK
IC202 PIN 17 ABOUT NO TROUBLE IN
5V AT OFF IC202
MODE ONLY
CHECK NO TROUBLE IN
12V, 6.3V LINE IC202, Q910, Q919
TROUBLE IN
LD901
CHECK INPUT WATTAGE
OFF MODE < 8W
SUSPEND < 15W
STAND BY < 15W
- 18 -
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