AOC L47H861 Schematic

47″LCD TV

AOC L47H861

Service

Service

Service

Horizontal Frequency

31~60 kHz

TABLE OF CONTENTS

Description Page

Table Of Contents.......……..............................…........1

Important Safety Notice.......................................……......2

Revision List…………………………………………………3

1.General Specification..............................………........4

2.Operating Instructions…………………….……….......5

2.1.The Use Of Remote Control…….………….…….......5

2.2.To Use The Menu…...…………………….……….......6

2.3.How To Connect…….…………..………….……….....8

2.4.Front Panel Control Knobs……………….……….....13

3.Input/Output Specification…………....................…....14

4.Mechanical Instructions…………………….................16

5.Repair Flow Chart ……………………….…….…….....19

6.PCB Layout ………………..……………….....….......24

Description Page

6.1.Main Board…………..……………...……….......24 6.2.Power Board……………..………….……….......27 6.3.Key Board………………………..……….......30 6.4.IR Board…………………………..……….......30

7.White-Balance, Luminance Adjustment...................31

8.Block Diagram.……...........................................33

9.Schematic……………...…………..………………...34 9.1 Main Board…………………………………...….......34 9.2.Power Board…………….…………...………….......49 9.3.Key Board……………….……….………….......53 9.4.IR Board………………………………..……….......54

10.Exploded View………………………………….…...55

11.BOM List……………….…………………………….56 12.Different Parts List……………………………………81

SAFETY NOTICE

ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.

CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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47″LCD TV				AOC L47H861
			Revision List
	Version	Release Date	Revision Instructions	TPV Model
	A00	July.-31-2008	Initial Release	E478MZNKW8A52N
	A01	Sep-28-2008	Add ne BOM	E478MZNKW8AENN
				E478MZNSW8AENN

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47″LCD TV

AOC L47H861

Important Safety Notice

Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.

It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

Hereafter throughout this manual, AOC Company will be referred to as AOC.

WARNING

Use of substitute replacement parts, which do not have the same, specified safety characteristics might create shock, fire, or other hazards.

Under no circumstances should the original design be modified or altered without written permission from AOC. AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.

Servicer assumes all liability.

FOR PRODUCTS CONTAINING LASER:

DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.

CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION -The use of optical instruments with this product will increase eye hazard.

TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE MANUAL.

Take care during handling the LCD module with backlight unit

-Must mount the module using mounting holes arranged in four corners.

-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen. -Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel.

-Protect the module from the ESD as it may damage the electronic circuit (C-MOS). -Make certain that treatment person’s body is grounded through wristband.

-Do not leave the module in high temperature and in areas of high humidity for a long time.

-Avoid contact with water as it may a short circuit within the module.

-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may damage the panel.)

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47″LCD TV

AOC L47H861

1. General Specification

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AOC L47H861

2. Operating Instructions

2.1 The Use of Remote Control

POWER

Press to power ON/OFF (standby) TV.(Note:1.TV is never completely power off.

unless physically unplugged. 2.Press to turn on TV after the power on status LED had changed to the red color and stopped flashing. )

VIDEO

Press repeatedly to choose S-Video/Composite source mode (Video 1 ~ 2).

COMP

Press repeatedly to choose Component source mode (Video 3 ).

PC/HDMI

Press repeatedly to choose VGA or

HDMI source mode (Video 4 ~ 6).

TV

Press to choose ATSC/NTSC TV source mode.

0 ~ 9 /- number

Press to enter TV channel number to select channel (Press ‘-’ to indicate choosing the sub-channel).

SLEEP

Press to set a time period (off/5 min /10 min /15 min /30min/45 min /60min/90min/120 min /180 min /240 min)after which the TV should switch itself to standby mode.

FREEZE

Press to freeze the displayed picture

CH-/ CH +

Press + or - to browse through the TV channels.

MENU

Press to open or exit menu.

“ ”,“ ”,“ ”,“ ”, “ENTER

Press to adjust the various function items on the menu.

5

PREV CH

Press to display the previous TV .

MTS/SAP

Press to activate the NTSC TV sounds, such as: Stereo, SAP or Mono tone. And languages of DTV.

WIDE

Press to choose the display aspect as: Normal, Wide, Zoom or Cinema mode.

SOURCE

Press repeatedly to choose the various input sources (Video 1 ~ 6).

EPG

This function is not support.

MUTE

Press to set TVsound mute ON/OFF

DISPLAY

Press to show the information about the input source TV channel display resolution and current time.

VOL- / VOL+

Press + or - to adjust the volume.

Exit

Press to exit menu or OSD.

V-CHIP

Press to lock / unlock Parental Control temporarily. (After setting the restricted table of MPAA or TV Rating.)

VIDEO ADJ

Press to choose the Brightness or Contrast adjustment.

AUDIO ADJ

Press to switch the ATSC multi-channel TV sounds.

CC

Press repeatedly to change the closed caption type as CC ON/CC OFF/CC ON WHEN MUTE.

FAVORITE

Press to toggle the Favorite/Normal mode.

47″LCD TV	AOC L47H861
2.2 To Use the Menus

1.Press the MENU button to display the main menu

2.Use the cursor up/down to select a menu item.

3.Use the cursor left/right to enter a submenu.

4.Press the ENTER button to enable/disable the function.

5.Press the MENU or EXIT button to exit the menu.

Press the MENU button to enter the main OSD (On Screen Display). Adjust theitems including Setup menu, Video menu, Audio menu and Feature menu.However, some function items in the menus may only be enabled in the particular source modes.

SETUP MENU

The Setup menu in TV mode shows as below. In others source modes, the Setup menu only shows Menu Language and Aspect Ratio items.

1.PROGRAM NO: Show the TV channel label menu for user modifying channel labels specifically.

2.AIR/ CABLE: Select TV source signal from the Air (antenna) or Cable (CATV).

3.AUTO SEARCH: Automatically scan all NTSC TV channels and then store in the channel table. In channel scan process, the OSD can display the number of channels which had been found.

4.SKIP :you can select the ship ON/OFF ,so that the program no channel can be delete or added.

VIDEO MENU

The Video menu in most source modes shows as below. It provides several videoadjustment items for user fine tuning the video display. Only in VGA sourcemodes, the Video menu simply provides Contrast, Brightness, Back light and Settings (Preset) items.

If you selected PERSONAL, press or to highlight an option, then press or to adjust the option. You can adjust:

1.CONTRAST: Video contrast adjustment, the tuning range is 0 ~ 100.

2.BRIGHTNESS: Video brightness adjustment, the tuning range is 0 ~ 100. 3.SATURATION: COLOR saturation adjust, the tuning range is 0 ~ 100

4.TINT: Video tint adjustment, the tuning range is R50 ~ G50.

5.SHARPNESS: Video sharpness adjustment, the tuning range is 0~10

6.BACKLIGHT: Backlight strength adjustment, the tuning range is 0 ~ 10.

7.EDGE ENHANCE: Press < or > to select HIGH, OFF, or LOW. 8.NOISE REDUCTION: Press < or > to select HIGH,OFF, LOW,or MID.

9.COLOR TEMPERATURE: Press < or > to select COOL, STANDARD, or WARM.

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AUDIO MENU

The Audio menu in TV mode shows as below. It provides audio adjustment for user to modify the audio setting. Audio language setting is only available with ATSC TV source, the option is disable under other source modes.

Press or to highlight AUDIO, then press > The AUDIO menu opens.

Press or to highlight PRESET, then press < or > to select an audio mode.

You can select:

•VOICE

•MUSIC

•THEATER

•PERSONAL

If you selected PERSONAL, press or to highlight an option, then press or to adjust the option. You can adjust:

•BALANCE—Adjusts the balance between the right and left audio channels.

•BASS—Adjusts the low sounds.

•TREBLE—Adjusts the high sounds.

FEATURE MENU

The Feature menu in av/S-video mode shows as below. It provides certain optional control functions such as inmage size, sleep timer, blue screen on/off, transparent, closed caption, color systerm. This menu gives users the most flexibilities to satisfy their generally demands. According to the various requirements in different source modes, certain features should be hidden

(disable) on the menu. The details footnotes will be described clearly below.

1.LANGUAGE: you can selete the ENGLISH SPANISH Portuguese French

2.IMAGE SIZE : you can selete WIDE, ZOOM, CINEMA, NORMAL

3.SLEEP TIMER: Enable or disable the TV standby timer. User can set the TV standby timer as off / 5 min / 10 min / 15 min/ 30 min / 45 min / 60 min/ 90 min / 120 min / 180min/ 240min. Timer starts to count down after cursor

leaving the sub-menu. (At the moment, the item shows ** min Left and the cursor highlights on the Feature icon.)

4.BLUE SCREEN: you can selete blue screen ON/OFF

5.TRANSPARENT: you can selete from 0 to 7

6.CLOSED CAPTION Press or to highlight CLOSED CAPTION, then press or to select the closed captioning mode. You can select CC1,CC2, CC3,

CC4, TT1, TT2, TT3 or TT4.

7.COLOR SYSTEM: this function you select color system,default is auto,you can choose NTSC, PAL M, PAL N.

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8. RESET: you can use it reset all setting to default.

VGA SETTING MENU

VGA Set: This option only shows and is available in VGA mode, which provides several items for the VGA display fine tuning, such as : H-Position , VPosition , Clock and Phase . All these items giving the tuning range from 0 to 100. Setting item provides the default VGA setting values restoring.

2.3 How to Connect Connecting Equipment

Coaxial (RF)

Using Your Antenna or Cable for TV

1.Turn off the power to the TV.

2.Connect the coaxial (RF) connector from your antenna or cable (outof- the-wall, not from the Cable Box) to the TV IN connector

3.Turn on the power to the TV.

4.Select TV using the INPUT button on the remote, side of the TV or directly by pressing the TV button on the Remote Control.

Using the Antenna or Cable for your VCR

1.Turn off the power to the TV and VCR.

2.Connect the “Output to TV”, “RF Out” or “Antenna Out” connector on the rear of your VCR to the TV IN connector at the rear of the TV.

3.Turn on the power to the TV and VCR.

4.Select TV using the INPUT button on the remote, side of the TV or directly by pressing the TV button on the Remote Control.

Connecting Your TV Set-Top Box Using HDMI

TV Set-Top Boxes that have a HDMI digital interface should be connected to the HDMI input of the LCD TV for optimal results.

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Connecting your TV Set-Top Box (Best)

Turn off the power to the TV and TV Set-Top Box.

1.Connect a HDMI cable to the HDMI output of your TV Set-Top Box and the other end to the HDMI Input at the rear of the TV.

2.Turn on the power to the TV and TV Set-Top Box.

3.Select HDMI using the INPUT button on the remote, side of the TV, or directly by pressing the HDMI button on the Remote Control.

For TV Set-Top Boxes with DVI

1.Turn off the power to the TV and TV Set-Top Box.

2.Using a HDMI-DVI cable, connect the DVI end to your TV Set-Top Box and the HDMI end to the HDMI Input at the rear of the TV.

3.Turn on the power to the TV and TV Set-Top Box.

4.Select HDMI using the INPUT button on the remote, side of the TV, or directly by pressing the HDMI button on the Remote Control.

Using Component Video

Connecting your TV Set-Top Box (Better):

1.Turn off the power to the TV and TV Set-Top Box.

2.Connect the Pr (red color) connector on your TV Set-Top Box to the corresponding Pr (red color) connector in the Component group.

3.Connect the Pb (blue color) connector on your TV Set-Top Box to the corresponding Pb (blue color) connector in the Component group.

4.Connect the Y (green color) connector on your TV Set-Top Box to the corresponding Y (green color) connector in the Component group.

5.Using an audio cable (red and white connectors), connect the cable to the audio output connectors associated with the Component output on your TV Set-Top Box and connect the other end to the audio connectors associated with the Component.

6.Turn on the power to the TV and TV Set-Top Box.

7.Select Component (Video 3) using the INPUT button on the remote, side of the TV or directly by pressing the Component button on the Remote Control.

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Connecting Your Basic Set-Top Box

Using Composite Video

1.Turn off the power to the TV and Set-Top Box.

2.Using an AV Cable, connect the Video (yellow color) connector on your Set-Top Box to the corresponding Video (yellow color) connector in the AV group at the rear of the TV.

3.Using the red and white connectors, connect the cable to the audio output connectors associated with the Video output on your Set-Top Box and connect the other end to the audio connectors associated with the AV input at the rear of the TV.

4.Turn on the power to the TV and Set-Top Box.

5.Select Composite (Video 1) using the INPUT button on the remote, side of the TV or directly by pressing the AV button on the Remote Control.

Using Coax (RF)

1.Turn off the power to the TV and Set-Top Box.

2.Using a Coax (RF) cable, connect one end to the TV OUT (RF) on your Set Top Box and the other end to the DTV/TV input at the rear of the TV.

3.Turn on the power to the TV and Set-Top Box.

4.Select TV using the INPUT button on the remote, side of the TV or directly by pressing the TV button (below the WIDE button) on the Remote Control.

Connecting Your DVD Player

Using HDMI

DVD players that have a digital interface such as HDMI (High Definition Multimedia Interface) should be connected to the HDMI input of the LCD TV for optimal results.

Connecting your DVD Player (Best)

1.Turn off the power to the TV and DVD player.

2.Connect a HDMI cable to the HDMI output of your DVD player and the other end to the HDMI Input at the rear of the TV.

3.Turn on the power to the TV and DVD player.

4.Select HDMI using the INPUT button on the remote, side of the TV or directly by pressing the HDMI button on the Remote Control.

For DVD Players with DVI:

1.Turn off the TV and DVD player.

2.Using a HDMI-DVI cable, connect the DVI end to your DVD player and the HDMI end to the HDMI Input at the rear of the TV.

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3.Turn on the power to the TV and your DVD player.

4.Select HDMI using the INPUT button on the remote or side of the TV, or directly by pressing the HDMI button on the Remote.

Using Component Video

Connecting your DVD Player (Better)

1.Turn off the power to the TV and DVD player.

2.Connect the Pr (red color) connector on your DVD player to the corresponding Pr (red color) connector in the Component at the rear of the TV.

3.Connect the Pb (blue color) connector on your DVD player to the corresponding Pb (blue color) connector in the Component group at the rear of the TV.

4.Connect the Y (green color) connector on your DVD player to the corresponding Y (green color) connector in the Component group at the rear of the TV.

5.Using an audio cable (red and white connectors), connect the cable to the audio output connectors associated with the Component output on your DVD player and connect the other end to the audio connectors associated with the Component input at the rear of the TV.

6.Turn on the power to the TV and DVD player.

7.Select Component using the INPUT button on the remote, side of the TV or directly by pressing the Component button on the Remote Control.

Using S-Video (AV)

Connecting your DVD Player (Good):

1.Turn off the power to the TV and DVD player.

2.Connect the S-Video jack on the rear of your DVD player to the SVideo jack in the AV group on the rear of the TV.

3.Connect an audio cable (white and red connectors) to the audio output connectors associated with the S-Video output on your DVD player and connect the other end to the audio connectors associated with the AV input on the rear of the TV.

4.Turn on the power to the TV and DVD player.

5.Select S-Video (Video 2) using the INPUT button on the remote, side of the TV, or directly by pressing the AV button on the Remote Control.

Using Composite (AV) Video Connecting your DVD Player (Good)

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AOC L47H861

1.Turn off the power to the TV and DVD player.

2.Connect the Video (yellow color) connector on your DVD player to the Video (yellow color) connector in the AV group.

3.Connect the R (red color) and L (white color) audio connectors on your DVD player to the corresponding R (red color) and L (white color) audio input connectors in the AV group.

4.Turn on the power to the TV and DVD Player.

5.Select Composite (Video 1) using the INPUT button on the remote, side of the TV or directly by pressing the AV button on the Remote Control.

Connecting Your VCR or Video Camera

1.Turn off the TV and VCR or Video Camera.

2.Connect the S-Video jack on the rear of your VCR or Video Camera to the S-Video jack in the AV group on the rear of the TV.

3.Connect an audio cable (white and red connectors) cable to the audio output connectors associated with the S-Video output on your VCR or Video Camera and connect the other end to the audio connectors associated with the AV input on the rear of the TV.

4.Turn on the power to the TV and VCR or Video Camera.

5.Select S-Video (Video 2) using the INPUT button on the remote, side of the TV or directly by pressing the AV button on the Remote Control.

Connecting to a PC Computer

1.Turn off the power to the TV and PC Computer.

2.Connect a 15-pin D-Sub RGB (VGA) cable to the RGB output of your pc computer and the other end to the RGB PC input at the rear of the TV.

3.Connect the Audio Out on your pc computer to the RGB PC Audio input at the rear of the TV.

4.Turn on the TV and PC Computer.

5.Select RGB using the INPUT button on the remote, side of the TV or directly by pressing the RGB button on the Remote.

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47″LCD TV	AOC L47H861
2.4 Front Panel Control Knobs

1.	VOL +	VOL +: Press to increase the sound volume level.
2.	VOL -	VOL - : Press to decrease the sound volume level.
3.	CH ▲	CH +: Press to select the next higher Program number.
4.	CH ▼	CH - : Press to select the next lower Program number.
5.	MENU	Menu key: Press to open or exit the OSD menu.
6.	INPUT	Source key: Press to select the input source.
7.		Power key: Press to turn on / off (standby) the TV set.
		(Please re-turn on TV after the Power-ON status LED had changed
		to the Red color and finished flashing.)

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3. Input/Output Specification

3.1 RGB Signal input

		1	5
		6	10
		11	15
	15 - Pin Color Display Signal Cable
Pin No.	Description	Pin No.	Description
1	Red Video	9	Mandatory +5V Supply for PC Bypass
2	Green Video	10	Sync Ground
3	Blue Video	11	SDA(Remote Control)
4	SCL(Remote Control)	12	Bi-directional Data (SDA) for PC Bypass
5	Ground	13	H-Sync.
6	Red Video Ground	14	V-Sync.
7	Green Video Ground	15	Data Clock (SCL) for PC Bypass
8	Blue Video Ground

3.2 HDMI Digital connector pin assignments

Pin No.	Description	Pin No.	Description
1	TMDS Data2+	2	TMDS Data2 Shield
3	TMDS Data2-	4	TMDS Data1+
5	TMDS Data1 Shield	6	TMDS Data1-
7	TMDS Data0+	8	TMDS Data0 Shield
9	TMDS Data0-	10	TMDS Clock+
11	TMDS Clock Shield	12	TMDS Clock-
13	CEC	14	NC
15	SCL	16	SDA
17	DDC/CEC Ground	18	+5V Power
19	Hot Plug Detect

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3.3 AV/S-Video/Component Video Inputs
	AV (Composite Video input)
	Video1
		System	NTSC
		Amplitude	1.0 V (p-p), negative sync.
		Impedance	75 ohm terminated
	S-Video (Y / C input)
	S-Video2
		System	NTSC
		Y signal amplitude	1.0Vpp (including sync)
		C signal amplitude	0.286Vpp
		Impedance	75 ohm terminated
	Component (Y, Pb/Cb, Pr/Cr input)
	Video3
		System	1080i, 480p, 720p, 480i
		Y signal amplitude	1.0Vpp (including sync)
		Cr, (R-Y) / Cb, (B-Y)	±0.35Vpp, 75 ohm
		Signal amplitude
		Impedance	75 ohm terminated

3.4 Compatible Mode Table

VESA MODES

				Horizontal		Vertical
				Nominal		Nominal	Sync	Nominal
	Mode	Resolution	Total		Sync			Pixel
				Frequency		Freq.	Polarit
					Polarity			Clock
				(KHz)		(Hz)	y
								(MHz)
		640x480@60Hz	800 x 525	31.469	N	59.940	N	25.175
	VGA	640x480@72Hz	832 x 520	37.861	N	72.809	N	31.500
		640x480@75Hz	840 x 500	37.5	N	75	N	31.500
		720x400@70Hz	900 x 449	31.469	N	70.087	P	28.322
		800x600@56Hz	1024 x 625	35.156	P	56.25	P	36.000
	SVGA	800x600@60Hz	1056 x 628	37.879	P	60.317	P	40.000
		800x600@72Hz	1040 x 666	48.077	P	72.188	P	50.000
		800x600@75Hz	1056 x 625	46.875	P	75	P	49.5
		1024x768@60Hz	1344x806	48.363	N	60.004	N	65.000
	XGA
		1024x768@70Hz	1328x806	56.476	N	70.069	N	75.000
		1024x768@75Hz	1312x800	60.023	P	75.029	P	78.750
	SXGA	1280x1024@60Hz	1688x1066	63.981	P	60.020	P	108.000
	FHD	1920x1080@60Hz	2080x1111	66.587	P	59.934	N	138.500

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4. Mechanical Instructions

1. Remove the 4 screws to remove the stand.

2. Remove 13 screws to remove the rear cover.

3. Remove the bkt-PCB-holder,

4. Remove main board, power board.

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AOC L47H861

5. Remove the bkt-PCB-holder, remove key board and IR board.

6. Release the speakers.

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AOC L47H861

7. Remove 16 screws to remove the main frame.

8. Disassembly bezel and panel.

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5. Repair Flow Chart

1. No Power (No LED indicator)

Check power cord and board interface

OK

		NG
	Check F901, BD901, C908

	OK
		NG
	Check IC902, Q901
	OK

NG	Plug in power cord and interface

Replace F901 or BD901 or C908

Replace IC902 or Q901

			NG
	Check T901					Replace T901
	OK
					NG
Check D907, C921, C923,							Replace D907 or C921 or C923 or
IC905, IC906							IC905 or IC906

2. Can not start (LED indicator yellow)

NG

Check key board

Repair the key board

OK

NG

Check 5V SB

Return to “1”

OK

NG

Check 3.3V SB

Check U703

OK

NG

NG

Check U411, X402

Replace U409 or X402

Check PWR ON signal

OK

Check I2C communication

Check main board power supply part

OK

NG

Check U401, U402

Replace the main board

OK

Check I2C communication

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3. No display (LED indicator green)

Check the source

Reset source

OK

NG

Check LVDS cable

Reset LVDS cable

OK

NG

Check D918, IC901, Q904

Replace D918 or IC901 or Q904

OK

NG

Check IC903, Q902, Q903

Replace IC903 or Q902 or Q903

OK

NG

Check T902

Replace T902

OK

NG

Check D906, C919

Replace D906, C919

OK

NG

Check U401

Replace main board

OK

NG

Check panel

Replace panel

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4. Abnormal display

Check the source

NG

Reset source

OK

NG

Check signal filter circuit

Replace the filter or inductance

TV signal

Check TV system setup

OK

NG

OK

Check TU201

Replace TU201

NG

HDMI signal

Check U501, U502,

ReplaceU501, U502,

OK

U503, U504

U503, U504

NG

Check U406

Replace U406

OK

NG

Check U401

Replace main board

OK

NG

Check panel

Replace panel

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5. No sound

Check the source

Reset source

OK

NG

Check signal filter circuit

Replace the filter or inductance

NG

Check Earphone jack

Replace the Earphone jack

SIF signal

Check TV system setup

OK

OK

NG

Check TU201

Replace TU201

NG

HDMI signal

Check U501,

ReplaceU501,

U502, U503, U504

U502, U503, U504

NG

Check U401

Replace U401

NG

Check U601, U602, U603

Replace U601 or U602 or U603

OK

NG

Check speaker

Replace speaker

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6. Key Board

OSD is unstable or not working

	Is Key Pad Board connecting normally?	N
			Connect Key Pad Board

	Y
	Is Button Switch normally?	N
			Replace Button Switch

	Y
			N
	Is Key Pad Board Normally?			Replace Key Pad Board
	Y
	Check Main Board

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6. PCB Layout

6.1 Main Board

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25