Service Manuals, User Guides, Schematic Diagrams or docs for : LG Monitor SW1727 CS767_5
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TROUBLESHOOTING GUIDE
1 . NO POWER
NO POWER
CHECK NO TROUBLE IN
P901 OK? POWER CORD
CHECK NO TROUBLE IN
FUSE F901
FUSE OK?
CHECK NO TROUBLE IN
D901 (DCV)? D901
DCV = 140 336V
TROUBLE IN
CHECK NO IC901(STR6707)
IC901 OK? R912, R913
CHECK NO TROUBLE IN
Q901, Q902 Q901, Q902, D903
OK?
CHECK CHECK TROUBLE IN
NO
SMPS TRANSFORMER SMPS SECONDARY
Q905
SECONDARY
OK? B+ LINE SHORT
CIRCUIT
NO
TROUBLE IN TROUBLE IN
PRIMARY OTHER Q904, Q905, Q909
COMPONENTS
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2. NO CHARACTER
NO CHARACTER
CHECK NO REFER
SCREEN CONTROL
NO RASTER
CLOCKWISE
CHECK TROUBLE IN
NO
IC301 PIN #4,6,9 R/G/B SIGNAL,
SIGNAL LEVEL SIGNAL CABLE
TROUBLE IN
CHECK IC301
NO
IC301 PIN #17,20,26
CLAMP (PIN 14)
SIGNAL LEVEL
IC301 12V VOLTAGE
CHECK NO TROUBLE IN
IC302 PIN #3,4,10 Q308, Q309, Q310, Q311,
SIGNAL D310, D311, D312
CHECK NO TROUBLE IN
CATHODE VIDEO PERIPHERAL CIRCUIT
LEVEL OF CRT PWB
TROUBLE IN
CONNECTOR ASS'Y
(MAIN P702 & P703-VIDEO P302)
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3. NO RASTER
NO RASTER
CHECK NO
VOLTAGE(CRT TROUBLE IN
HEATER) 6.3V 6.3V LINE
CHECK NO
REFER TROUBLE IN
IC701(#4/#14) H/V SYNC.
H/V SYNC.
CHECK NO
TROUBLE IN
IC701(#6/#15) H/V IC701
OUTPUT
TROUBLE IN
CHECK NO IC501,IC502,Q501,
T702 (PIN#2) VOLTAGE Q502,Q503, Q504,
63V (at H-Freq. Q505,Q506 or
31.5kHz.) DEFLECTION YOKE
CHECK Q713 NO
TROUBLE IN
COLLECTOR ABOUT
Q713, D706, D705
1050Vp-p
CHECK G1 NO TROUBLE IN
VOLTAGE ABOUT Q202, Q203, Q204,
-10 10V Q205, Q206, Q207
0 0.4V
CHECK
IC804 PIN#20
TROUBLE IN 2 5V REFER TROUBLE IN
G2 VOLTAGE
H/VSYNC.
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4. TROUBLE IN H.V SYNC
TROUBLE IN
HOR. OR VER. SYNC
CHECK
CONNECTOR P302 NO TROUBLE IN
(#1,2) , P703(#3,4) SIGNAL CABLE
SIGNAL
CHECK
IC804 (pin #11,12) NO TROUBLE IN
H/V SYNC. H/V SYNC LINE
SIGNAL
CHECK CHECK
NO NO TROUBLE IN
IC804 (pin #22,23) IC804 (pin #1, 17)
H/V SYNC. VOLTAGE 5V LINE
SIGNAL 5V ?
3 5V CHECK Yes
CHECK TROUBLE IN
IC804 (pin #20) IC804 (pin #4) Freq. IC804
VOLTAGE 3.58MHz
0 0.4 V NO
TROUBLE IN TROUBLE IN
IC802, IC805, Q801 X801, C808, C809
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