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HL42BG-B




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1.Features-----------------------------------------------------------------3


2.Safety Precautions---------------------------------------------------6


3. Images of Module and Circuit Boards-----------------------7


4. Trouble Shooting Guide -----------------------------------------15



5.Bus Control Adjustment------------------------------------------16


6.Circuit Diagram ---------------------------------------------------- 25


7.Connection Sketch Interpretat---------------------------------48




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1. Features
Factory model(reference
L42A9A
only)
HAC model HL42BG-B
Options Functions
Screen size (inches) 42
General Display type LCD
Aspect ratio 16:9
Resolution 1366*768
Brightness 500 cm/2
Contrast 1000:1
Response time(ms) 8ms
Display Capabilities 480i/480P/720P/1080i/1080p
Video
Viewing Angle H:178/V:178
Color display 16.7million
Active Matrix TFT yes
PC mode (VGA, SVGA,
XVGA) SXGA\XGA\SVGA\VGA
Tuner Integrated NTSC&ATSC
HD-ready yes
Video Signal System NTSC/ATSC(8VSB,Clear QAM)
Color Temperature Standard,Cool,Warm,user
Progressive Scan yes
Digital Comb Filter 3D
Video Noise Reduction yes
Video Features Picture Modes standard,vivid,mild,custom
# of preset channels 181
Screen Mode (4:3) yes
Wide Mode (16:9) yes
Wide Mode (PC) yes
Auto adjustment (PC) yes
Phase (PC) Only yes
H\V edge correction yes
Number Of Speakers 2
Speakers Type Built-in(bottom)
Audio Speaker Size 4 1/2" X 2" (2 pcs)
Watts Per Channel 10W
Audio Power Output 10W*2
Stereo Surround Sound yes
MTS Stereo yes
Concert Living Room Hall
Sound Mode
Audio Features Bathroom Cave Arena Church
Tone Control yes
Speakers ON/OFF yes
Mute yes


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Semi transparent Menu yes
Zoom yes
V-Chip yes
Close Caption
(Basic,Digital,Advance) yes
Teletext N/A
Multilingual Display E/F/S
Auto Channel
Programming yes
Channel Caption yes
Channel Label yes
Convenience
Channel Skip/Add yes
Features
Favorite Channel yes
Program Guide
Access(TV guide) yes
Clock yes
Programmable Timer yes
Sleep Timer yes

Alarm (Auto timer on/off)
yes
Picture-In-Picture N/A
Freeze Picture yes
Remote Control HTR-282I(Universal)
ATSC/NTSC Tuner 1
HDMI Input 2
Component Video Input 2
Composite Video Input 2
S-Video Input 1
RF Input 1
PC Input 1
Input \ Output USB Port /

Analog Audio Input 2 for component, 3 for composite
and S-video
PC Audio Input 1 (VGA and HDMI-to-DVI)
Audio Out
(Fixed/Variable) 1(optical)
Headphone jack 1
Audio Output(RCA) 1
Compliance Vesa yes
Power Internal power Supply yes
Power Consumption (in
Operation) 240W
Power Consumption (in
Standby) 1W
Power Voltage 120V


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Power Frequency 60Hz
Unit Dimensions (in) 42*4 7/8*29 7/8
Unit Dimensions with
42*12 1/4*31 1/2
Stand (in)
Dimensions Stand Dimensions (in) 22 1/8*12 1/4*9 1/8

Speaker Dimensions (in) /

Carton Dimensions (in) 46 1/8*15 1/4*35 1/8
Unit Weight (lb) 57 3/8
Unit Weight with Stand
66 1/8
(lb)
Weight
Stand Weight (lb) /
Speaker Weight (lb) /
Carton Weight (lb) 84 7/8
Warranty Warranty terms 1 year*
Remote Control yes
Batteries yes
AC Power Cord yes
VGA Cable N/A
Accessories
S-Video Cable N/A
Operating Instructions yes
Quick Set Up Guide yes
Speaker Cable Built-in
40 Ft 124
Container Qty 40 Ft HQ 124
20 Ft 60
Panel Supplier LG
Information
Chipset MTK5371




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2.Safety Precautions




6
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3. Images of Module and Circuit Boards
a: Signal flow-chart




b. Printed Circuit IC Board
1) head-on board
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2) rear board
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Key IC Description& Trouble Shooting Guide
1. Key IC Description
1 MTK5371
Media TEK MT5371 is highly integrated SOC which include DTV backend decoder and TV controller.MT5371 support transport
de-multiplexer,MPEG-2 video decoder,AC3 audio decoder,LVDS transmitter,TV decoder.The MT5371 enables consumer electronics manuactrues to
build high quality,feature-rich DTV.
World-Leading Video Technology:MT5371 embeded the MDDi deintelacer to generate very smooth picture quality for motion. 3D comb filter also
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recovery high detail for still picture.The special color processing technology provide favorite ande natural color for TV.
Rich Feature for high value produce:To enrich the features of DTV,MT5371 suppout HDMI receiver,PIP/POP,memory card and DV decoding.
Credible Analog Technology:The MT5371 integrated with high speed VGA ADC,high resolution Video/Audio DAC and 12-bit Video DAC.It will
provide very fine quality for TV.




2 HYB25DC256163CE-5
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3)MT8291
-
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4) MT5112
-
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4. Trouble Shooting Guide
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5 Bus Control Adjustment
1 Factory Mode
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Using the romote controller to enter into Factory Menu.
Press Menu to call main menu displaying on the screen. And then press "8"," 8","9","3","OK" in turn.You will see the screen displaying as
following.You can check the version of the software,adjust some settings.But we don't advise you change this settings.because of the TV has already
hold in the state of optimality.If you have to chang this settings,please connect with the local service center.

1. Factory menu




2. Version info
Version info: This is the current software version.
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2)Video: It include Auto Color and Color Temperature.
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3) Audio:
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It include these functions :

Dolby Banner On/Off
Compression Line/RF
Compression Factor Full/Off/ 7/8 / 3/4 / 5/8 / 1/2 / 3/8 / 1/4 / 1/8
Downmix Off/ Lt/Rt /Stereo


4)Channel:
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Channel menu includes:

Range Scan
Single RF Scan
Factory Scan




5) Function:
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Function ment includes:

Burning Mode On/off
Clean Storage

Remark:
The date of the chart only is a example,please don't adjust the factory mode base on it.
2 Others
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-
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6. Circuit Diagram
A


CE83 10uF/16V
YPBPR1L_IN R401 33k YPP1_L




+
+5V
1,2,7,11,12,15,16 +5V
YPBPR0L_IN CE67 10uF/16V R402 33k YPP0_L +12V
1,2,16 +12V




+
CE76 DV33
YPBPR1R_IN 10uF/16VR403 33k YPP1_R 1,2,5,6,7 DV33




+
SIF_SCL R399 33SCL14
YPBPR0R_IN CE66 10uF/16V R404 33k YPP0_R SIF_SDA R400 33SDA14




+
YPBPR2R_IN CE65 10uF/16V R243 33k YPP2_R




ADCV33
YPP1_R

YPP0_R
YPP0_L
YPP1_L
VGA_R
C298 C299




VGA_L
AV2_R

AV1_R
AV2_L

AV1_L
+
+5VSB




AV3_L
CE75 1,2,7,12,14,15 +5VSB
YPBPR2L_IN 10uF/16V R265 33k YPP2_L
22pF 22pF




+
CE72




48
47
46
45
44
43
42
41
40
39
38
37
10uF/16V
VGAL_IN R405 33k VGA_L U34
+




AIN6R

AIN5R

AIN4R

AIN3R

AIN2R

AIN1R
ADCV33
AIN5L

AIN4L

AIN3L

AIN2L

AIN1L
VGAR_IN CE81 10uF/16V R406 33k VGA_R AV1R_IN
9 AV1R_IN AV1L_IN
+



AV2L_IN CE70 10uF/16V R407 33k AV2_L 9 AV1L_IN
AV3_R ADCGND AV2R_IN
+

1 AIN6L ADCGND 36 9 AV2R_IN
AV1L_IN CE77 10uF/16V
R408 33k AV1_L YPP2_L 2 35 ADCREFP +12V AV2L_IN
CE84 AIN7R ADCREFP ADCREFN L73 FB HPVDD 9 AV2L_IN
+

YPP2_R 3 AIN7L ADCREFN 34 AV3R_IN
10uF/16V AO1BCK 9 AV3R_IN
AV2R_IN R409 33k AV2_R 2 33x4 RN31
1 4 BCLK0 VIMDADC 33 VMIDADC AV3L_IN
AO1LRCK 4 3 5 32 DACV33 C937 9 AV3L_IN
+




CE64 10uF/16V AO1MCLK LRCK0 DAV33 DACREFP + CE113 0.1uF
AV1R_IN R410 33k AV1_R 6 5 6 31 + CE82
AO1SDATA4 MCLK0 MT8291 DACREFP DACREFN 100uF/16v SMD-CC0603
8 7 7 30 AV / SV AUDIO INPUT
+




10uF/16V AO1SDATA3 R411 33 DIN0 DACREFN DACGND 10uF/16V
AV3L_IN CE74 R236 33k AV3_L 8 DIC1 DACGND 29
9 28 VMIDDAC
+




BCLK1 VMIDDAC
AV3R_IN CE68 10uF/16V R237 33k AV3_R 10 LRCK1 AVDD 27 AVDD
11 26 AVR_CE YPBPR0R_IN
+




I2SIN_DATA R412 33 MCLK1 VOUT1R AVL_CE 10 YPBPR0R_IN YPBPR0L_IN
12 DOUT VOUT1L 25 10 YPBPR0L_IN
AVDD




VOUTOR
HPOUTR
HPOUTL



VOUT0L
RESET#
YPBPR1R_IN




HPGND
HPVDD
MUTE#
10 YPBPR1R_IN




DGND
DVDD
C939 YPBPR1L_IN
0.1uF 10 YPBPR1L_IN




CL
DI
VMIDADC + CE73 SMD-CC0603 YPBPR2R_IN
10 YPBPR2R_IN YPBPR2L_IN
10uF/16V 10 YPBPR2L_IN




13
14
15
16
17
18
19
20
21
22
23
24
C941
+ CE78 0.1uF
YPBPR AUDIO INPUT




AVR_OUT
AVL_OUT
10uF/16V DV33




HPGND
HPVDD
SDA14
SCL14
DGND




HPOR
DVDD




HPOL
L74 FB DVDD ADCV33

+ CE114 C305
100uF/16v + CE86 0.1uF
OPCTRL6 MT8291_Reset SMD-CC0603 VGAR_IN
10uF/16V 11 VGAR_IN VGAL_IN
R413 470 11 VGAL_IN
+5VSB
R414 200 VMIDDAC R239 10K VGA AUDIO INPUT




3
3




C944 OPCTRL7 R238 4.7k 1 Q18
MUTE 1 Q22 + CE120 0.1uF TRANSISTOR NPN SMD(B-C-E) DACV33
R416 1K 2N3904 47uF/16V SOT23




2
CAP6-5MM C304
Dont need OPCTR6,We can control it by OPCTR7.
0.1uF
2




+ CE80
SMD-CC0603 I2SIN_DATA
AVR_OUT CE87 AO1AUXR 10uF/16V 5 I2SIN_DATA AO1SDATA3




+
220uF/16V CAP8-5MM 5 AO1SDATA3 AO1SDATA4
Reserve to solve POP noise AVL_OUT CE88 AO1AUXL 5 AO1SDATA4




+
220uF/16V CAP8-5MM AO1MCLK
5 AO1MCLK AO1BCK
ADCREFP 5 AO1BCK AO1LRCK
HPOR CE89 HPOUTR 5 AO1LRCK




+
A 470uF/16V CAP8-5MM C948 AUDIO I2S INTERFACE A
+ CE69 0.1uF
HPOL CE90 HPOUTL SMD-CC0603




+
470uF/16V CAP8-5MM 10uF/16V
AO1AUXR
14 AO1AUXR AO1AUXL
14 AO1AUXL
R230
1K R231 R232 R233 GPIO_19
SMD-R0603 1K 47K 47K DACREFP 5 GPIO_19 OPCTRL6
SMD-R0603 SMD-R0603SMD-R0603 5 OPCTRL6 OPCTRL7
5 OPCTRL7
C950
+ CE79 0.1uF
SMD-CC0603 SIF_SDA
10uF/16V 4,7,15 SIF_SDA SIF_SCL
4,7,15 SIF_SCL
MUTE
15 MUTE

HPOUTR HPOUTL
3




3
MUTE R234 1 Q16 MUTE R235 1 Q17
10K 2SD2653K 10K 2SD2653K HPDET
5,14 HPDET
SMD-R0603 SOT23 SMD-R0603 SOT23
2




2




CE85
10uF/16V
AVL_CE R419 470 AUD_LOUT
+




CE71 10uF/16V CN19
AVR_CE R420 470 AUD_ROUT
+




1 1 AUD_LOUT

2 2
3 3 AUD_ROUT



EJTAG3 (3pin/2.0mm)
AUD_LOUT
3




1




AUDEO L/R OUTPUT
MUTE R421 1 Q24 R422
10K 2SD2653K 10K/NC D68
SOT23 MVS0603E10
2




+5V
CN31
2




5
AUD_ROUT HPDET
4
3




1




3 HPOUTR
MUTE R423 1 Q25 R424
2SD2653K 2
10K 10K/NC D69 HPOUTL
SOT23 1
MVS0603E10
2




PHONE JACK
2




Line out




A
A B C D E

AV33
2,5,6,11,12 AV33
DV33
1,2,5,6,7,13DV33