LG CE-21F66X Service Manual page 30

PRINTED CIRCUIT BOARD
MAIN & CPT
TROUBLESHOOTING
NO RASTER
CHECK +B
at D821 cathode
Normal Abnormal
Check
Is the voltage at pin37
FUSE of AC line
& 12 of IC501 8V?
No
OK
Yes
Check the in/out
of IC841/IC844
Check the voltage
Check pin40
No
of C805
of IC501(H-out)
No
Check &replace
254~380V
IC501 Yes
Check u-COM
pin3 low?
Check Q401
Check the voltage
collector waveform
No of pin3
Check &replace
Yes
Q401
Check T401
Check /replace
& each pin voltage
IC801,IC803,IC804
No
Check &replace Yes
T401
Check &replace
T401
NO TELETEXT
Check the
voltage at pin44 of IC01
0V
3V
Check& Replace
Check the waveform
IC01,IC03
at pin12 of IC01
YES
NO
Check / Replace Check& Replace
Q512,R533 38~41pin of IC01
NO SOUND / PICTURE OK
MONO
Select correct system
in menu
OK
Check the waveform Check the waveform
NO
Open at pin 15 of IC501 at pin 2 of IC501
OK
Check /replace
Check the waveform NO
Fuse,DB801 Check/Replace Q601
at pin 1 of IC601
OK
0V
NO
Check the waveform
Check /replace
Check/Replace IC601
DB801 at pin 4 of IC601
OK
NO
Check/Replace
Check the voltage
FR601,FR803,D804
at pin 5 of IC601
RF STEREO
Select correct system
in menu
OK
NO
Check the waveform Check the voltage
at pin 24,25 of IC101 at pin 3,13,14 of IC101
OK
NO
Check the waveform Check the voltage
at pin 24,25 of ICN03
at pin 16,33,45 of ICN03
OK
NO
Check the waveform
Check/Replace
at pin 4,12 of IC602
QN01,QN02
OK
NO
Check the voltage Check/Replace
Q602,603,IC603
at pin 6,7 of IC602
OK
Check the waveform
at pin 1,2,14,15 of IC602
OK
NO
Check the voltage Check/Replace
at pin 3,13 of IC602 FR601,803,D804
COMPONENT LOCATION GUIDE
C708........E5 F801A .....G2 P207 ........B3 R07 .........C2 R212 .......D4
C02 .........C1 C301........E4
C302........E4 C709 .......G4 F801B .....G1 P208 ........B3 R08 .........C1 R213 .......D4
C03 .........C2
C303........E4 C710 .......G5 FB602 .....C1 P209 ........B3 R09 .........C2 R214 .......D5
C04 .........D2
C304........E4 C801 ........F2 FB603......A3 P210 ........B3 R12 .........C2 R216 .......D4
C05 .........C2
C06 .........C2 C305........E4 C802 ........F3 FB604......A3 P211 ........B4 R13..........B2 R217 .......D4
C07..........B3 C306........E5 C803 .......G2 FB801 ......F2 P212 ........B2 R14 .........D2 R218 .......D4
C08 .........C2 C307........E5 C804 ........F3 FB802 ......F2 P213 ........B3 R15 .........D2 R219 .......D4
C09 .........C2 C309........E4 C805........E4 FB803......E2 P302 ........E5 R16 .........C2 R220 .......D3
C10..........A4 C401 .......G4 C806 .......G2 FB804......E3 P501 ........B3 R19 .........C1 R221 .......D3
C11..........E4 C403 .......G3 C807 .......G2 FB805 ......F2 P601 ........A2 R20 .........C1 R224 .......D5
C12..........E4 C404 .......G4 C808 ........F2 FB806 ......F2 P602 ........A3 R21..........B3 R225 .......D5
C13 .........C2 C405 .......G4 C809 .......G1 FR601 .....D1 P603........C3 R22..........B3 R226 .......D5
C14 .........D1 C406 .......G4 C810 ........F2 FR701 .....E5 P604........D3 R23 .........C1 R227 .......C5
C16 ..........F1 C407 ........F3 C811 .......G3 FR702 .....E5 P803 .......G1 R24 .........C1 R228 .......C5
C17..........E1 C501 .......C3 C812 .......D1 FR703 .....G4 P901 ........A1 R25 .........C1 R229........A4
C18..........E1 C502 .......C4 C813 .......D1 FR704 .....E5 P902 ........B1 R26 .........C1 R230 .......C5
C19 .........C2 C503 .......C3 C814........E1 FR705 .....E5 P903 ........B1 R28 .........D5 R231 .......C5
C20 .........C2 C504 .......C3 C815........E2 FR802 .....E2 P904 ........B2 R29 .........D2 R232 .......D3
C21 .........C2 C505 .......C3 C816........E3 FR803 .....E2 P905 ........A2 R32..........A4 R252 .......C1
R253 .......D2
C22 .........C2 C506 .......C3 C817........E3 FR804 .....E2 P906 ........A1 R34..........E5
R254 .......D2
C23 .........C2 C507 .......C5 C818........E3 FR901 .....B1 P01A .......D1 R35..........E5
R255 .......C1
C24 .........C2 C508 .......C3 C819........E3 IC01 ........D2 P02A .......C2 R37 .........D1
R38 ..........F1 R256........B1
C25 .........C2 C509 .......C3 C820........E3 IC02 ........C1 P02B .......B2
R40 ..........F1 R257 .......D3
C26 .........C2 C510........B3 C821 ........F4 IC03 ........C2 P03A .......C1
R41..........E1 R302........E4
C27 .........C2 C511........B3 C822........E3 IC04 ........C2 P04A .......D1
P301A......F4 R42 ..........F1 R303........E4
C28 .........C2 C512........B3 C823 ........F3 IC05 ........D1
P301B......F4 R43 .........D1 R304........E5
C29 .........C2 C513........B3 C824........E1 IC06 ........D1
P301C .....F4 R44 .........C2 R305........E4
C30 .........D2 C514........B3 C825 .......G3 IC07 ........D1
IC101 ......C5 P301D .....G4 R45 .........C2 R306........E4
C31 .........D2 C515........B3 C826 .......D1
IC201 ......D3 P501A .....C3 R46..........E1 R308........E4
C101........A4 C516........B3 C827 ........F4
IC202 ......D5 P501B .....C4 R47..........E1 R309 .......G4
C102 .......C4 C517........B3 C829 ........F2
C830........E2 IC301.......E4 P502A .....B3 R48 .........D1 R401 ........F3
C103........A5 C518........B3
C831........E2 IC501 ......C3 P502B .....C4 R49 .........D1 R402 ........F4
C104........A5 C519 .......D5
C832........E2 IC502 ......C2 P503A .....C4 R52 .........D2 R403 .......G3
C105 .......C4 C520 .......D5
C521........B3 C835 .......D4 IC601.......A3 P503B .....E5 R53..........B2 R404 .......G3
C106 .......C5
C522 .......D3 C836 .......D2 IC602.......A3 P504A .....C3 R54..........B2 R405 .......G3
C107........A5
C523........B3 C901........B1 IC603.......A2 P504B .....D3 R55 .........D2 R406 .......G4
C108........A5
C109........A4 C524........B3 C902........B1 IC801 .......F3 P505A .....C3 R56..........B2 R407 .......G4
C110........A5 C525........B3 C903........B1 IC802 .......F3 P505B .....A4 R57 .........C2 R408 ........F4
C111 .......C4 C526 .......C3 C904........B1 IC803 ......G2 P801A .....G1 R58..........B2 R501 .......C4
C112........B5 C527........B4 C905........B1 IC804 .......F3 P801B .....G1 R59..........B2 R502 .......C3
C113........B4 C528........B4 C906........B2 IC840 ......D2 P802A......F1 R60..........B2 R503 .......C3
C114........B5 C529........B4 C907........A1 IC841.......E4 P802B......F1 R61..........B3 R504 .......C3
C115........B4 C530........B4 C908........B1 IC843 ......D2 PA01........F1 R62..........B3 R505 .......C3
C116........B4 C531........B4 C909........A1 IC844.......E4 PJ201 ......C5 R63..........B3 R506 .......C3
C117........B4 C532........B4 C910........A1 IC901.......A1 PJ202 ......C1 R64..........B2 R507 .......C3
C118........B5 C533........B4 D01 .........D2 L01 ..........C2 Q01 .........A4 R67 .........D3 R508 .......D3
C119........B4 C534........B4 D02 .........C1 L02 ..........E1 Q02 .........D5 R101........A5 R509 .......D3
C120........B5 C535........B4 D03 .........C2 L03 ..........C2 Q03 .........E4 R102........A5 R511 .......D3
C121........B4 C536........B4 D04 .........C2 L04 ..........C2 Q04 .........D1 R103........B5 R512 .......C4
C122........B5 C537........B4 D05 .........D1 L101 ........B4 Q101 .......B4 R104........B5 R513 .......C4
C123........B5 C538........B4 D101........A5 L102 ........C5 Q102 .......B4 R105........A5 R514 .......C3
R515 .......C3
C124........B5 C539........B4 D102........B4 L103 ........B5 Q103 .......B5 R106........B5
R516 .......C4
C125........B5 C540 .......C4 D104 .......C5 L104 ........C4 Q104 .......B5 R107........A4
R517........B3
C126........B5 C541 .......C4 D301........E5 L105 ........C5 Q105 .......B5 R108........A5
R109........A4 R518........B3
C127 .......C5 C542 .......C4 D303........E4 L106 ........C4 Q106 .......A4
R110........B4 R519........B3
C128 .......C4 C543 .......C4 D401 .......G4 L107 ........C5 Q107 .......A5
R111........B4 R520........E5
C129 .......C4 C544 .......C4 D402 ........F4 L201 ........D4 Q108 .......C4
Q109 .......C5 R112........B4 R521 .......D5
C130........B4 C545 .......C4 D501 .......D4 L203 ........D3
Q201 .......C5 R113 .......C4 R522 .......D5
C131........B4 C547 .......D2 D502........E5 L204 ........D5
Q202 .......D4 R114........B4 R523........A4
C132 .......C4 C548........A4 D503........B3 L205 ........D5
L206 ........D5 Q203 .......D4 R115........B4 R524........A4
C133 .......C4 C549........A4 D504........B3
L207 ........D5 Q204 .......D4 R116........B5 R525........A4
C134........B4 C550........A4 D505........B3
L208 ........D5 Q205 .......D2 R117........B5 R526........B3
C135........B4 C560 .......C3 D506........B3
D507........A4 L209 ........D5 Q206 .......D2 R118........B4 R527........A3
C136........B4 C561 .......C3
D508 .......C4 L251 ........C1 Q207 .......D4 R119........B5 R528........A3
C137 .......C4 C563 .......D3
D509 .......C4 L252 ........C1 Q401 .......G3 R120........B5 R529........A4
C138 .......C4 C564 .......D3
C565 .......C3 D510........A4 L253 ........B1 Q402 .......G4 R121........B5 R530........A4
C139........A2
C566 .......C3 D511........A4 L254 ........B1 Q501 .......C3 R122........B5 R531........A4
C140........A2
C567 .......C3 D561 .......C3 L255 ........C1 Q502 .......D3 R123 .......C5 R532........B3
C141........A5
C142........A5 C568 .......C3 D562 .......C3 L301 ........F4 Q503 .......D3 R124 .......C4 R533........B3
C201 .......D5 C571 .......C4 D563 .......C3 L302 ........F4 Q504 .......C3 R125........B5 R534........B4
C202 .......D4 C572........B3 D564 .......C3 L401 ........G4 Q505 .......C3 R126........B4 R535........E4
C203 .......D4 C573........B3 D701........E5 L402 ........F4 Q506 .......D5 R127 .......C4 R536 .......C4
C204 .......D5 C574........B3 D702 ........F5 L501 ........C4 Q507 .......A4 R128 .......C4 R537 .......C4
C205 .......D4 C601........B2 D703 .......G4 L502 ........C3 Q508 .......A4 R129 .......C4 R538........B4
C206 .......D4 C602........A3 D705 .......G5 L503 ........D3 Q509 .......A4 R130 .......C4 R539........B3
C207 .......D4 C603........B2 D801........E2 L504 ........C2 Q510 .......A4 R131 .......C4 R541 .......C4
C208 .......C2 C604........A2 D802 ........F3 L506 ........D3 Q511 .......A4 R132 .......C4 R542 .......C4
C209 .......D4 C605........A3 D803 ........F3 L507 ........B3 Q512 .......B3 R134 .......C5 R543 .......C4
C210 .......D2 C606........A2 D804 .......D2 L508 ........B3 Q513 .......D3 R135 .......C5 R544 .......C4
C211 .......D4 C608........A2 D805 .......D2 L509 ........B3 Q514 .......C4 R136 .......C5 R560 .......C3
C214 .......D3 C609........B2 D806 ........F2 L510 ........B3 Q515 .......C3 R137 .......C5 R561 .......D3
C215 .......D3 C610........A2 D807........E3 L511 ........A4 Q561 .......D3 R138........B5 R562 .......C3
C216 .......D3 C611........B2 D808........E3 L512 ........B3 Q601 .......B2 R139 .......C5 R563 .......D3
R564 .......D3
C218 .......D5 C612........A2 D809........E1 L513 ........C4 Q602 .......B2 R140........B4
R565 .......C3
C219 .......D5 C613........B2 D810........E1 L561 ........C3 Q603 .......A3 R141........A5
R566 .......C3
C220 .......D5 C614........A3 D811 .......D1 L562 ........C3 Q701 .......G5 R142........A4
R201 .......C5 R567 .......C3
C221 .......D5 C615........A3 D812 .......D1 L802 ........E4 Q801 .......E4
R202 .......C5 R569 .......C4
C222 .......D5 C616........A3 D813........E4 L901 ........B2 Q802 .......E4
R203 .......C5 R570 .......C3
C223 .......D5 C617........A4 D814 .......D1 LD01 ........F1 Q803 .......E1
Q804........F4 R204 .......C4 R575 .......D3
C224 .......D5 C618........A2 D815 .......D2 P101 ........A5
Q805........F4 R205 .......D4 R576 .......C3
C225 .......D5 C701........E5 D816 .......D2 P102 ........B5
R01 .........D1 R206 .......D4 R601........A3
C226 .......C5 C702........E5 D817 .......D1 P201........C1
P202........D3 R02 .........D2 R207 .......D4 R602........A3
C251 .......C1 C703........E4 D901........B2
P203........C1 R03 .........D2 R208 .......D4 R603........A2
C252 .......C1 C704........E5 D902........A1
P204 ........B3 R04 .........D2 R209 .......D4 R604........A2
C253 .......C1 C705........E5 D903........B1
D904........A1 P205 ........B4 R05 .........C2 R210 .......D4 R605........A2
C254........B1 C706 .......G5
DB801 .....G2 P206 ........B4 R06 .........C2 R211 .......D4 R606........A4
C255........B1 C707 .......G5
NO
NO Check the waveform NO Check/Replace
Check the waveform
Z561,562,563,564
at pin 3 of IC201 at pin 1 of IC501
OK
NO Check/Replace
Check the waveform
at pin 9,10 of IC201 IC201,Q205,Q206
NO PICTURE / NO SONUD
No
Check/Replace
NO OK Check IC01 pin38,39,40,41
Check receiving system in MENU
IC01,Q103,Z101,Z103,
(R,G,B,FB)
Q108,Q109
NO
Check IC01 pin19,20
(V-Sync, H-Sync)
NO Check/Replace
Check IC01 pin34,35
ICN01,ICN03 (XTAL1,XTAL2)
& IC01
Store in manual-program MENU
NO
Check Check 5V, 33V & IIC Bus Line
5V, 33V &
IIC Bus Line
NO
Check / Replace
TUNER, IC501
NO
Check
CVBS singal Line
& IC501
WIRING DIAGRAM
R609........A2 Z103 ........C5
R610........B2 Z104 ........B4
R611........B2 Z561 ........C3
R612........A2 Z562 ........C3
R613........A3 Z563 ........C3
R614........B2 Z564 ........C3
R615........B2 ZD01 .......D5
R616........A2 ZD02 .......D1
SPK(R)
R617........B2 ZD101 .....A4
4
R701........A4 ZD102 .....A5
R702........E5 ZD201 .....C1
R703........E5 ZD202 .....D5
R704........E5 ZD301 .....E4
ZD501 .....C4
R705 .......G5
ZD601 .....B2
R706........E5
ZD701 .....E5
R707........E5 CPT PWB
R801 ........F3 ZD702 .....E5
R802 ........F3 ZD703 .....G5
R803 .......G3 ZD801......F4
R804 .......G3 ZD901 .....B1
P902 P903
R805 .......G3 ZD902 .....B1
R806 ........F3 ZD903 .....B1
R807 .......D1 ZD904 .....B1
R808........E4
R809 .......G2
R810........E1
R811........E3
R812 .......G3
R813........E4
R814........E3
R815 ........F3
R816 ........F3
R817 .......D2
R818........E3
R819 ........F4
R820 .......D2 P802A
R821 ........F4
P04A
R822 ........F4
P203 P03A
R823 ........F4
P601
R824 ........F4
SPK(L)
R901........B1
R902........B1
P602
R903........B1 P501
SPK(R)
R904........B1
R905........B1
R906........A1
MAIN PWB
R907........A1
R908........A1
R909........A2
R910........B1
R911........A1 SPEAKER LEAD(L) ( " C " POINT ) SPEAKER LEAD(L)
R912........B1
* SPK(L) LEAD HOLDER 2
RC801 .....F2
RL801......E2 CONNECTOR .
SG901 .....A1
SG902 .....A2
SG903 .....A2
SG904 .....B1
SG905 .....A2
SW01 ......D1
SW02 ......D1
SW03 ......D1
SW04 ......D1
SW05 ......E1
SW06 ......E1
SW801 ....G1
T101 ........B4
T102 ........B4
T103 ........B4
T401........G4
T501 ........D3
T502 ........D3
T503 ........D3
T701 ........F5
T801 ........F1
T802 ........F3
T803 ........E1
TH801 .....E2
TP1..........B3 AV STEREO BOARD
TP2..........B4
TP3..........B4
TP4..........B5
TP5..........B5
TP6..........B5
TP8..........B4
TP9 .........C4
TP10 .......C4
TP11 .......C5
TP12 .......C3
TP13 .......C3
TP14 .......D3
TP15 .......D3
TU101 .....B5
VD801 .....G1
VL101 ......B5
X01..........C2
X501 ........B4
X502 ........B4
Z101 ........C4
RF STEREO BOARD
NO RASTER / SOUND OK
Is any OSD displayed?
OK
& excute Auto-program.
Check
Does the Auto-program OK
HV, Screen voltage of Ik Current of
operate properly.
CPT IC501, pin18
NO
Not OK OK
Check/Replace
CPT Board
of TUNER
Components
OK
Check
Go to
FBT T701
Is the CVBS signal OK.
NO SOUND /
( IC501 pin6 )
PICTURE OK
OK
Check R,G,B signal
at IC501 pin19,20,21
OK
Check / Replace
CPT Board component
SPK(L)
3
P801
P301
P302
( " D " POINT )
SPK(L) LEAD
* SPEAKER LEAD(L)
D-COIL .
SIDE AV BOARD
CONTROL BOARD
Check the
Heater voltage of CPT
(6 ~ 6.5Vrms)
OK Not OK
Check Check the
Heater pulse of FBT
T701
Not OK OK Not OK
Check Check
FR705,FR901,P302 FBT T701
Check
IC501, ZD901
P501, & P902