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FILE NO.

SERVICE MANUAL LCD Television Model No. 37LC804H
(Argentina)
Service Ref. No. 37LC804H-00




VIDEO MODE POWER



RECALL DISPLAY MUTE AUDIO MODE




SLEEP


ECO PIP CHANGE MAIN/SUB


IMAGE BACK

CH




NOBLEX CH


ZOOM SURROUND BASS SOUND




Product Code:113004620
Contents
Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Original Version
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chassis Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . 4 Chassis Series: UH1-L
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
IC7200 Port Functions . . . . . . . . . . . . . . . . . . . . . 12-14
CPU (IC8000) Port Functions . . . . . . . . . . . . . . . . 15-16
Give complete "SERVICE REF. NO." for parts order or
On-screen Service Menu System . . . . . . . . . . . . . 17-24 servicing. It is shown on the rating label at the cabinet
Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . 25 back of the unit.
Mechanical Disassembly . . . . . . . . . . . . . . . . . . . 26-31
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Chassis Electrical Parts List . . . . . . . . . . . . . . . . 34-53 This T.V. receiver will not work properly in for-
eign countries where the television transmission
system and power source differ from the design
specifications. Refer to the specification table.




N4BVA
Safety Notice
Safety Precautions

The following precautions must be observed.

1: Comply with all caution and safety-related notes provided on the cabinet back, cabinet bottom, inside the
cabinet or on the chassis.

2: When replacing a chassis in the cabinet, always be certain that all the protective devices are installed
properly, such as, control knobs, adjustment covers or shields, barriers, etc..

DO NOT OPERATE THIS TELEVISION WITHOUT THE PROTECTIVE SHIELD IN POSITION AND PROPERLY
SECURED.

3: Before replacing the cabinet cover, thoroughly inspect the inside of the cabinet to see that no stray parts or
tools have been left inside.

Before returning any television to the customer, the service personnel must be sure that it is completely safe to
operate without danger of electrical shock.




Product Safety Notice

Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list
in this manual be used for component replacement designated by mark . No deviations from resistance
wattage or voltage ratings may be made for replacement items designated by mark .




-2-
Specifications
Power Source AC 110 - 220 Volts, 50/60Hz

Receiving System PAL-N/N, PAL-M/M, NTSC-M/M

Channel Coverage ANTENNA mode
VHF: CH02 - CH13
UHF: CH14 - CH69
CATV mode
VHF band: CH01-CH13
MID band: CH14-CH22
SUPER band: CH23-CH36
HYPER band: CH37-CH64
ULTRA band: CH65-CH94 and CH100-CH125
Low MID band: CH95-CH99

Aerial Input Impedance 75

LCD Panel
Screen Size (Measured Diagonally): 37 inches
Picture Resolution: WXGA 1366 (Horiz.) x 768 (Vert.) pixels
Brightness: 500 cd/m2

Audio Output (RMS) 10W+10W

Speakers 6 cm x 12 cm x 2 pcs.

Input and Output Terminals
AV1 Input Video: Composite video Input (RCA Jack) x 1
S-Video Input (Separated Y/C) DIN 4-pin Jack x 1
Audio: L/R Stereo Input (RCA Jack) x 1 set

AV2 Input Video: Component Y, CB,CR Input (RCA Jack) x 1 set
Audio: L/R Stereo Input (RCA Jack) x 1 set

HDMI Input HDMI Terminal 19 pin x 1

Computer Input Video Input: D-SUB 15 pin x 1
Audio Input: Mini stereo jack x 1

Output Terminals
Video Monitor Output: Phono jack x 1
Audio Monitor Output: L/R Stereo Output (Phone Jack) x 1 set
Headphone Jack: Mini stereo jack x 1

Dimensions 1069 (W) X 642 (H) X 279 (D) mm (Included Swivel Stand)

Weight approx. 29.5 kg (Included Swivel Stand)

Environmental Considerations
Operating Temperature 0C ~ 40C (32F ~ 104F)
Operating Humidity 20 ~ 80%
Storage Temperature -10C ~ 50C (14F ~ 122F)
Storage Humidity 20 ~ 80%


Specifications subject to change without notice.



-3-
IC003 ASSY, PWB, MAIN SP SP
SYNC. SEPARATION ASSY,PWB, KEY ASSY,PWB, LED
A201 TV-SYNC D1902 LED (POWER)
2 8 TO IC8000 SW1950~
TUNER (PIN-45) R L SW1956 U1901
RC
4/10 5/9 6 7 17 RECEIVER D1901 LED
IC8011 IC8002 (TIMER)
TV CVBS IC150 EEPROM EEPROM K19K
71 AUDIO IC101
K8002




T-SCL
AUDIO AMP. 5




T-SDA
AUDIO-R CONTROL/3D SURROUND 6 5 6 K19A
72
AUDIO-L R POWER K8000
70 R R 24/25 KEY IN KEY IN
(K1002)




SCL
SDA
59




SCLE
SDAE
32 26 9 L RC-IN
VIDEO MONITOR OUT L L 15/16
46 13 73 74 29 30 75 95 18 76 78
61 1 7
HEADPHONE
AUDIO MONITOR OUT-L
51 SCL PH-L/R JACK
42 IC8000
AUDIO MONITOR OUT-R 27/28 K1330 CPU
61 IC1200 SDA
43




MONITOR OUT
AV SW IC8600 55~58 46~49 35 36 43 37 38 89 4 45 12
AV1 VIDEO IN CLOSED CAPTION
6 PROCESSOR
AV1 AUDIO IN-L BLK
T-SCL
Chassis Block Diagram




T-SDA

7 22 57 SDA
29




AV1 IN
AV1 AUDIO IN-R B
9 21 58 SCL
28 MCU BUS
FAN CONTROL




P-FAIL-1




Y IN (AV1) G
RESET




P-FAIL-2
P-FAIL-3
TV-SYNC




Y 8 20 59 IC2203
72~75 69~71
POWER ON




S-VIDEO S IN (AV1) R 3
12 15 19 60 DIGITAL
AV1 IN 1
(K1001) C IN (AV1) VIDEO
C 10 CVBS DECODER
64 7 IC1709




-4-
AV2 TERMINAL (K1003) Y 43~47,
62 8 54~61
AV2 AUDIO IN-L 50~52
15 C
60 17 IC7200
AV2 AUDIO IN-R
17 HDMI L/R LCD TV Controller
29/31
AV2 VIDEO IN with
14 PC L/R K7205
22/24 Dual LVDS Transmitter

COMPONENT Y IN COMPONENT Y IN
LCD PANEL
30 160~171 (WXGA)
COMPONENT CB IN COMPONENT CB IN
28
COMPONENT CR IN COMPONENT CR IN
33
PC AUDIO INPUT PC L/R
R/G/B
(K7204) 25/23/20
HORIZ. SYNC. / VERT. SYNC
PC (VGA) 18/19
INPUT IC7209
(K7200) STEREO D/A CONVERTER IC7201
81~153
HDMI L/R SDRAM
5/8 1~4 188~191

DVI 207/208/2/3/5/6/
INPUT 8/9
IC Block Diagrams (On the ASSY, PWB, MAIN)

IC003 < Sync. Separation> LA7217M-T IC101 < AUDIO AMP. > LA4919N-E

Headphone Block

HP IN1 1 VG=6dB 28 HP OUT1
Ripple filter Voltage
Regulator Vcc




NC
NC




HP IN2 2 VG=6dB 27 HP OUT2




14
1




H/P Standby SW
HP D.C 3 26 POWER GND



AFC
SYNC
VIDEO IN F.B CLAMP SYNC OUT VD OUT GND




Output A
SEP




VCC
amplifier
HP Standby 4




13
25 OUT2-
2




Nonlinear
COUNT


B
DOWN




amplifier
AMP Standby 5 AMP. Standby
24 OUT2+



AFC CTL VCO OUT VCO IN
SW
Output


12
amplifier
3




D.C 6 Ripple filter 23 SW GND
Switching regulator Block

H. L. S Switching
DDL 7 Drive 22 SWB
11
4




Muting circuit A B C D
ON TIME 8 used at power 21 SWE
VCO
32fH




*H. L. S
on Higher Level
Signal Selector
V. SEP




IN2 9 20 SW OUT
10
5




Intput
PRE GND amplifier Headphone stage
10 Input amplifier stage 19 VCC
Switching regulator stage
HD OUT DET OUT




Output amplifier
LOCK




11 18
DET




PRE VCC stage
Power TR stage
6




9




REF amplifier
IN-VREF 12 Output C
17
amplifier
EXC




IN1 13 16 OUT1+
7




8




Input amplifier Nonlinear D
amplifier
POWER GND 14 15 OUT1-
Output
amplifier




IC150 < Audio Control/ 3D Surround>NJW1167V
TONE Ha

TONE La
SS-FIL
AGC1




OUT a




ADR
SDA
SCL
LF3
LF2
LF1




8 3 4 5 28 31 30 7 15 14 13

24 CVA
23 CVB
INa 1 VOL 1 TONE VOL 2 22 CVW
21 CTH
INTERFACE




eala 20 CTL
IIC BUS




&
SIMULATED 19 CSR
AGC LPF VOL 2 Trimmer
STEREO 12 PORT1
11 PORT0
10 AUX1
INb 32 VOL 1 TONE VOL 2 9 AUX0

16 GND
BIAS
17 V+
25 2 29 27 26 6 18
VREF
OUTw
TONE Hb
SR-FIL
AGC2




TONE Lb




OUT b




-5-
IC Block Diagrams (On the ASSY, PWB, MAIN)

IC1651 < 1 ch Power Controller by the PWM Switching System > FA7700V-TE1



RT 1 UVLO 8 CS
VREF 0.3V ON/OFF
+
VREF
OSC
REF 2 2.2V 5.5V
1.5V
+
S.C.P
7 VCC
1.5V
BIAS S.C. DET
+ 2.2V
Power Good Signal

IN- 3 +
+ ON/OFF OFF 6 OUT
+
+
ERROR. PWM
AMP.
FB 4 5 GND



IC2203 < Digital Video Decoder > TVP5147PFP


Copy CVBS/Y VBI
Protection Data
Detector Processor


VI_1_A 80 Analog 43 ~ 47 ,
CVBS/ Front End
C/Pb
VI_1_B 1 Composite and S-Video processor 50 ~ 54
VI_1_C 2 Y/C Y Luma Y (9~0)
Separation Output
Processing
5-line C Formatter
VI_2_A 7 Adaptive Chroma
Clamping C (9~0)
Comb Processing
CVBS/ AGC M
VI_2_B 8
Y U 57 ~ 60 ,
VI_2_C 9 X
63 ~ 66 ,

VI_3_A 16 2 x 11-Bit 69 ~ 70
CVBS/ ADC
VI_3_B 17
C/Pr
VI_3_C 18

CVBS/Y VI_4_A 23 35 GPIO


Sampling
Clock Timing Processor Host
with Sync. Detector Interface



74 75 33 34 40 36 71 73 72 37 28 29
HS/CS
VS/VBLK
RESETB
XTAL1




GLCO
DATACLK


FID
XTAL2
PWDN



AVID




SCL


SDA




-6-
IC Block Diagrams (On the ASSY, PWB, MAIN)

IC1200 < AV Switch> LA79500E
VIDEO BLOCK
TV1 71 CLAMP
TV2 75 CLAMP
CV1 78 CLAMP
CV2 6 CLAMP 64 VOUT1
CV3 14 CLAMP
CV4 34 CLAMP 0 or 6dB AMP.
MUTE




56 VOUT2

0 or 6dB AMP.
MUTE




46 VOUT3

0 or 6dB AMP.
MUTE

Y1 80 CLAMP
Y2 8 CLAMP
Y3 16 CLAMP
Y4 36 CLAMP 62 Y/VOUT1
YCOMB 65 CLAMP
Y5 21 CLAMP 0 or 6dB AMP.
Y6 28 CLAMP
MUTE




54 Y/VOUT2

0 or 6dB AMP.

MUTE
+
C1 2 BIAS
C2 10 BIAS
C3 18 BIAS
C4 38 BIAS 60 COUT1
CCOMB 68 BIAS
MUTE 0 or 6dB AMP.




52 COUT2
MUTE
0 or 6dB AMP.




MUTE
+



MUTE
PR5 25 CLAMP 0 or 6dB AMP.
PR6 32 CLAMP
57 PROUT1

MUTE
0 or 6dB AMP.
PB5 23 CLAMP
58 PBOUT1
PB6 30 CLAMP
MUTE
0 or 6dB AMP.
49 PROUT2

MUTE
0 or 6dB AMP.
50 PBOUT2

MUTE




-7-
IC Block Diagrams (On the ASSY, PWB, MAIN)
IC1200 < AV Switch> LA79500E

AUDIO BLOCK

TV1L 70 BIAS
TV2L 74 BIAS
V1L 79 BIAS
V2L 7 BIAS 61 LOUT1
V3L 15 BIAS
V4L 35 BIAS 0 or 6dB AMP.
MUTE
CP5L 22 BIAS
CP6L 29 BIAS




53 LOUT2

0 or 6dB AMP.
MUTE




47 LOUT3

0 or 6dB AMP.
MUTE




TV1R 72 BIAS
TV2R 76 BIAS
V1R 1 BIAS
V2R 9 BIAS 59 ROUT1
V3R 17 BIAS
V4R 37 BIAS 0 or 6dB AMP.
MUTE
CP5R 24 BIAS
CP6R 31 BIAS




51 ROUT2

0 or 6dB AMP.
MUTE




45 ROUT3

0 or 6dB AMP.
MUTE




-8-
IC Block Diagrams (On the ASSY, PWB, MAIN)

IC7209 < Stereo D/A Converter > CS4334-KSZ

DEM/SCLK AGND VA
2 6 7



LRCK 3
Host
Serial Input
Interface De-emphasis Voltage Reference
Interface
SDATA 1


Analog 8 AOUTL
Interpolator Modulation DAC Low-Pass
Filter



Analog
Interpolator Modulation DAC Low-Pass 5 AOUTR
Filter


4
MCLK




-9-
IC Block Diagrams (On the ASSY, PWB, POWER)

IC601 < Transition-mode PFC Controller > L6562D
COMP MULT CS
2 3 4

INV 1 MULTIPLIER AND
+ THD OPTIMIZER 40K



VOLTAGE OVERVOLTAGE 5F




+
REGULATOR DETECTION
Vcc

UNTERNAL
Vcc 8 SUPPLY 7V
R Q 15V
R1
25V S
7 GD
+ UVLO DRIVER
Start
stop
R2 VREF2
ZERO CURRENT
DETECTOR
+
2.1V STARTER
1.6V

DISABLE


6 5
GND ZCD
(Zero Current Detector)




IC602 MR4010-7101

VCC VIN Collector
4 7 9

Latch circuit UVLO Start-up circuit
reset comparator comparator UVLO comparator

Start-up
+ + +
Circuit
OVP
comparator VUL Vcc(start) Vcc(start-up off)
/Vcc(stop) /Vcc(start-up on)
+

VOVP R
Q
Thermal Shutdown
S
+
Q1
Circuit
Soft Drive
Z/C 1 Zero Current
Detection Circuit
S
Circuit

(Zero Current Q
Detection Turn-on R
Terminal) Dead Timer
OCP threshold compatator
+
Standby
Circuit
VTH (OCL)
Vref


IF/B
F/B 2 Burst mode OCP
threshold compatator
(Feed Back Re-start
+ Timer
Terminal)
On width +
Timer
VTH (Burst Limit)




3 5
GND Emitter/OCL




-10-
IC Block Diagrams (On the ASSY, PWB, POWER)

IC603 < High Voltage Resonant Controller > L6598D
Vs H.V.
12
OP AMP Vboot
+ 16
OPOUT 5
6
UV BBOTSTRAP HGV HVG
DETECTION DRIVER