LG 21FG1AL, Service Manual, Page: 15 / 22

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AC INPUT
P801A/B,SW801
FUSE & VARISTOR
NO POWER
FUSE OPEN
FILTER SECTION
T802(150-F06T)
RELAY(DEGAUSS)
RL801,Q845,D847
NO MICOM CONTROL
NO DEGAUSS
PURITY PROBLEM
BRIDGE RECTIFIER
DB801(TS4B05G)
NO POWER
FUSE OPEN
NO RECTIFIER
DC O/P
T803
NO POWER
NO STR VCCSUPPLY SO
NO POWER
FUSE OPEN & STR
DAMAGED DUE TO CHANGE
IN PRIMARY INDUCTANCE
OF SMPS
IC801(STR-W6754)
SECONDARY LOAD REGULATION POOR
OVER VOLTAGE PROT. NOT OPR.
NO POWER / INTERMITANT NO POWER
SWITCHING NOISE
START RESISTOR
R804,R805
STR SWITCH ON PROB.
NO POWER
STR VCC POWER SECTION
D815,R804,R805,R810,R839
STR NO OPR./NO POWER
EXCESSIVE I/P VOLTAGE CAUSES
NO POWER/ NO OSCILLATIONS
STR FEED BACK SECTION
D845,R810,C840
STR NO OPR./NO POWER
INTERMITENT NO POWER
SECONDARY O/P VOLTAGE POOR
INTERMITANT ST-BY MODE
LOAD REG. FB SECTION
IC802,Q840,R808,R853,C852
SMPS SEC LOAD REG POOR
INTERMITANT NO POWER
18101
18102 18103
18104
18105
18106
18108
18110
18111
18200
18205
NO POWER
POWER RADIATION
SAFETY PROBLEM
TO
DEGAUSS
COIL
VD801(TVR621D)
F801(T4AL250V)
4. SMPS PRIMARY SECTION
5. SMPS SECONDARY SECTION
STR-
W6554
C831
(220u/160V)
R107
(RS 12K/2W)
SMPS
Trans
(S-Vcc)
17V
20V-(10W)
LA42101 (#7,Vcc)
T/X Pre-Amp
110V
D824
(SFAF504G)
C831
(330u/25V)
11V
D813
(RU3AMV)
C826
(1000u/16V)
R873
(47/0.5W)
D-Coil Relay
MAIN IC (#24, Vcc)
EEPROM (#8, Vcc)
IC804
LV76213(#9, Vcc)
D826
(RU3AMV)
LV76213(#20, Vcc)
LV76213(#49,Vcc)
FBT B+
R833
(RS 0.47/2W)
L802
(82uH)
FR403
(RF 1.2/2W)
Tuner 30V
KIA78R09API
112.17V / 395mA 110.1V 110.07V 109.63V / 380mA
29.97V / 10mA
3.3V / 10mA
5.0V / 13mA
8.0V / 15mA
14V / 25mA
KIA78L05BP
IC803
R620
(RS 5.6/2W)
5.0V / 231mA
LV76213(#62,#4 Vcc)
LA72730 (#8 Vcc)
(st-by 5V)
(105V~120V)
(28V~32V)
NT: 398mA
PAL:503mA
KIA7805API
LA72702N (#19 Vcc)
TUNER(Vcc)
R529
(RS 68)
R513
(RS 300)
R520
(RS 620)
5.0V / 14mA
5.0V / 40mA
5V /75mA.
NT: 360mA
PAL:465mA
LC75024E (3.3V Vcc)
85mA
LA42102 (#7,Vcc) IC 601 (SOUND-amp) 5W+5 W ST
LA42102N (#7,Vcc)
IC 601 (SOUND-amp) 10W+10W ST
IC 601 (SOUND-amp) 5W MONO
17V
ST_BY 1W
Option
D806
(TVR06J)
C838
(2200u/25V)
IC806
KIA78R05API
IC04
LA42102 (#5,St-by)
IC 751 (S/W IC )
IC 661 (RF STEREO NT)
IC 501 (Main IC)
IC 601 (SOUND-amp)
LC75024E (1.5V Vcc)
IC 807 (NICAM)
IC 501 (Main IC 3.3V Vcc)
IC 501 (Main IC Hor Vcc)
IC 501 (Main IC RGB Vcc)
180V
D505
(RGP10J))
C540
(4.7u/250V)
CPT Board
26V
D301
(RGP15J))
C309
(470u/35V)
LA78040N
(#2,Vcc)
184.47V / 18mA
28.2V / 320mA
FBT
Trans
FM TX, Game, USB OPT
60mA
5V
145mA.
3.3V Reg.
1.5V Reg.
ST-5V
ST-5V
5V_1
R132
(RS 68)
3.3V
1.8V
9V
9V
9V
9V
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Only for training and service purposes. LGE Internal Use Only