8. SOUND PROCESSING SECTION
TUNER
LA42102L(10W*2))
NICAM IC
(LC75024E)
ANT.
Sound Amp.
Speaker
TUNER : RF signal is feed to TUNER through Antenna. IF output from Tuner is then given to 1 CHIP IC.
1 CHIP IC : 1 CHIP IC processes the input IF. Demodulates Picture and sound information and gives analog R G B
output for Display and SPKL/R as audio output, this sound output is further Amplified and feed to speakers.
Sound Amp : Sound amps(LA42102L) is and Audio Amplifier it amplifies the output sound signal from
Surround ic(LC75024E) and feeds to speaker which generates Sound.
11100
12500
13602
13
60
3
1 CHIP IC
(LV762XX)
11500
- 16 -
CPT CIRCUIT VCC / GND
Heater Voltage
e-GUN Dead
e-GUN LIFE
DECREASE
FR932
17006
16100
CPT DRIVE
SECTION
11500
VIDEO PROCESSING
SECTION
CPT / e-GUN
ONE SIGNAL R/G/B)
MISSING
NO PICTURE, CPT
Dead
16004
DISCHARGE
PROTECTION CIRCUIT
ONE SIGNAL (R/G/B)
MISSING
16101
R,G,B Signal-IN
L902, L903, L904
16005
Spot Killer CIRCUIT
SPOT & TRAY
C901, R902, D903
16002
Vcc 180V
1
5 GND
R
G
B
L902
L903
L904
R915
C907
R905
C904
R922
C902
R921
R906
R916
Q901
Q902
9V
R908
L901
180V
>
>
>
D902
9. CPT DRIVE SECTION
The CPT-BOARD assembly is composed of discrete type RGB
Amplifier.
Amp- Gain is defined by Resistance of R917, R912,R923.
High Frequency compensation is made by inductance of L901,
capacitance of C907,C904 and C902.
DC level of emitter of Q901,Q902 and Q903 is defined by R908.
CPT Board Circuit
11700
16100
R G B AMP CIRCUIT
16101
R
G
B
L902
L903
L904
R915
C907
R905
C904
R922
C902
R921
R906
R916
Q901
Q902
9V
R908
L901
R917
R912
R923
Q903
180V
D902
Copyright©2008 LG Electronics.Inc. All right reserved.
Only for training and service purposes.
LGE Internal Use Only
Summary of Contents for 21FG5RG
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