RCA 26LA33RQ Schematic

For qualified service personne_ only Version 1 ,_0

Mode_o 26LASSRQ

Changing Entertainment. Again.

www.rca.com

Revision No. Revision Date Page Description 1 May.24th, 2011 All Initial Release

Version 1.0

1.1 Basic Specifications

Diagonal Display Size

Television System

Channel Coverage

Temperature

Humidity

Power Supply

RF input

Connection Interface

Video input

Audio input

Audio output Graphic input

Resolution Component/HDMI mode

With stand

Dimensions

Without stand With stand

Weight

Without stand

Power Consumption

26 inches

American TV standard ATSC/NTSC system VHF:2_13 UHF: 14_69 CATV: 1_135

Digital Terrestrial Broadcast (8VSB) : 2_69 Digital Cable (64/256QAM) : 1_135 Storage Temperature is _0°C_ +60°C Operating Temperature is 0°C_+50°C

(-4°F_+ 140°F)

(_32°F_+ 122°F) Storage Humidity: Less than 85% RH (No condensation) Operating Humidity: Less than 80% RH (No condensation)

AC 110 V, 60Hz

Cable/Antenna x 1

AVx 1

Component x 1 HDMI x 4

AVx 1

Component x 1 PC Audio In x 1

Headphone x 1, Digital Audio Out x 1, AV x 1 RGB 15pin x 1

1366 x 768

480i, 480p, 720p, 1080i

25.9" W x 18.7" H x 8. 0"D

25.9" W x 17.2" H x 4.3"D

19.8LBS (9.0KGS)

15.9LBS (7.2KGS)

less than 80W

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1,2 Product Function

Side Keypad Buttons

If you cannot locate your remote, you can use the side keypad buttons on your TV to operate many TV features.

INPUT: Displays the Source Select List. MENU: Displays the TV Main Menu. OH ,, : Scans up through the channel list. In the TV menu system, it acts like the up arrow on the remote control and

can be used to select menu options.

OH ,, : Scans down through the channel list. In the TV menu system, it acts like the down arrow on the remote control

and can be used to select menu options.

VOL+: Increases the volume. In the TV menu system, it acts like the right arrow on the remote control and can be used

to select menu options.

VOL-:Decreases the volume. In the TV menu system, it acts like the left arrow on the remote control and can be used

to select menu options.

POWER (O): Turns the TV on and off.

Front Panel

Power/Standby Indicator: Blue and red dual-color LED. It shows red when the TV is turned off and blue when turned on. Remote Control Sensor: Remote control IR sensor, which receives infrared ray sent by remote control.

-_ _ _-

Remote Control Sensor

'_ Power/Standby Indicator

(blue/red)

For more information about TV function, please refer to the User's Manual.

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1.3 Connection Interface

HEAD PHONE: Connect a 3.5mm headphone for personal audio. Digital Audio-out: Connect a coaxial cable for digital audio output. HDMII, 2, 3, 4: (High-Definition Multimedia Interface) It provides an uncompressed digital connection that carries both video and audio data by

way of an integrated mini-plug cable. AUDIO OUTPUT L/R: Connect double-channel coaxial cables for analog audio output.

Note: .DigitalAudio-out and AUDIO OUTPUT L/R are supposed to be

connected to audio power amplifer, which provides smoother and more

powerful sound performance.

AUDIO-IN L/R, Video In: Connect an AV device that has composite video

jacks, such as a VCR or a DVD player. To access device connected to these

jacks, press the INPUT button on your remote; then press the up/down arrow to

select AV. Press the ENTER button at last to confirm.

• AUDIO-IN L: Left audio channel connection. The left audio connector is usually white.

For mono audio sources, be sure to use the leftAUDIO INPUT.

• AUDIO-IN R: Right audio channel connection. The right audio connector is usually red. COMPONENT Y/Pb/Pr: Connectadevicethathascomponentvideojacks, such as a DVD player.

To access device connected to the Y/Pb/Prjack, press the INPUT button on your remote; then press the

up/down arrow to select Component. Press the ENTER button at last to confirm.

• Y/Pb/Pr (Component Video): They provide good picture quality because the video signal is separated into three components.

Use three video-grade or component video cables for the connection. When using Y/Pb/Pr, make sure you

connect left and right audio cables to the Audio L and Audio R jacks.

PC INPUT VGA: Connect your computer or other device withaVGAoutputtothisjackusinga15-pin, D-

sub cable.

PC INPUT Audio-In: Use to obtain sound when a PC is connected to TV. Use 3.5mm stereo mini-pin cable

to connect PC to TV. ANT/CABLE: Connect to receive the signal from your antenna or cable via coaxial cable. SERVICE: For service use only. Do not connect any device.

2.1 General Information

GENERAL DESCRIPTION

OVERVIEW

V260B2- P03 is a 26-inch TFT LCD cell with driver ICs and Ich-LVDS interface. This module supports

1366 x 768 WXGA format and can display 16.7M colors ( 6 bit+Hi FRC). The backlight unit is not built in

CHARACTERISTICS

CHARACTERISTICS ITEMS Screen Diagonal in]

Pixels [lines] Active Area [mm]

Sub Pixel Pitch [mm] Pixel Arrangement

Weight g] Physical Size mm] Display Mode

Contrast Ratio

Glass thickness (Array/CF) [mm] Viewing Angle (CR>10)

Color Chromaticity

Cell Transparency ]

Polarizer (CF side)

Polarizer (TFT side)

SPECIFICATIONS

26.0 1366" 768

575.769* 323.712

0. 1405 (H)_0. 4215 (V)

RGB vertical stripe TYP. 850

592(W) x 339.8(H) x 1.84(D) Typ. TN, Normally White 800:1 Typ.

(Typical value measured at CMOs module)

0.7/0.7

+80/ 80(H), +80/ 70iV) Typ.

(Typical value measured at CMOs module) R 0.653, 0.326 GO. 272, 0. 587 B 0. 150, 0. 086 W0.311,0. 320

•Please refer to color chromaticity on p. 16

7.0_,OTyp.

(Typical value measured at CMOs module)

Anti Glare coating,

587.4(H) x 335.2(w). Hardness: 3H

587.4 (H) x 335.2 (w), Hardness: 3H

3.1 Inner Structure

Inside cabinet (front)

5 5

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Item List

1 RE3240E010 IR board 22F, 45 x 15 x 1.6 mm (1)

2 RE0340E010 Key board 22F, 106.9 x 11.9 x 1.6 mm (2)

3 RE01TC81XLNA0 Main board T.RSC8.1X

4 RE46Q H1500 Power board FS P 150-4 H01 150W

5 RE261530458105 Speakers 8Ohm, 10W

Note: (1,2) 22F and dimensions refer to the PCB board.

3.2 Main board connection

CN9 CN17

CN25 CN5

CNA3

CNA1

(Continued in next page.)

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Jack List

Jack No, Specification Description Connection I Note

CN25 10 Pin 2.54mm Main power To Power board

CN17 2x20 Pin 2,0ram LVDS interface To LCD panel

CN9 14 Pin 2.0mm IR and keyboard jack To IR board and keyboard

CN5 6Pin2.0mm inverter Jack To LCD panel inverter board Backtightcontrol

CNA3 4 Pin 2.54mm Amplifier power supply jack To power board

CNA1 4 Pin 2.54mm Speaker jack To Speaker

3.3 Power board connection

CON3

CON4

CON1

Jack List

CON1 2 Pin 3.96mm AC input jack To AC power supply

Amplifier power supply To main board

CON3 8 Pin 2.54mm Backlight power supply To LCD panel backlight inverters

CON4 13 Pin 2.54mm Main board power supply To main board

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3,4 Connection Diagram

Pin flat cable ......... {

CON3

2 _

-_ _ CON4

CON1

8Pin flat cable

Keyboard

26" LCD panel

@ @

6 Pin flatcable

r .....

4Pin to 4.Pin

J _

AC 110V

50/60Hz

flat cable

13Pin to 10Pin flat cable

IR board

5 Pin flatcable

4Pin flat cable °°°,

LVDS double array cable

CN17

CN5

CNA3 o CN25 _ _

CN9

CNA1

E]_ Left speaker

[_ R_ght

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Note: Before opening the cabinet and working on the repairs, please read the troubleshooting and Q&A attached in the

user's manual, which has covered most of the problems caused by unproper using or settings to the TV set. If that does not work, please carry out the easy troubleshooting before checking or replacing the main parts of the television. The troubleshooting guides given below base on the situation in which the TV's functions are set and used properly.

Plus, if the easy troubleshooting can not help, please work on the repairing according to the procedures given in chapter 5, Exception Handles.

4.1 Troubleshooting for Common Use

TV can not be turned on

• Check the connection and condition of wires and inlets that relate to power board, including the AC power inlet, the power incoming wire, wires between power board and mainboard, etc.

o Check the diagram arround power board to see If there exists a short circuit or creepage.

• The power board may be bad. Please change the board for testing. If it cannot help, refer to the chapter 5 for more intensive information.

• In addition, the malfunction of LCD panel can cause failure of power on. Please refer to 4.2 Troubleshooting for Displaying for more information.

Auto turning off

o Check the sleep timer setting.

• Check the surrounding diagram of power board. The problem is most possibly caused by short circuit or wire breakage, because this kind of malfunctions can cause excessive current, which will make the power board startup self-protection.

The screen goes black after a shorting blink

e If the TV screen can not display after the blink, that means the panel or other parts of equipment is broken (most likely by

unproper input voltage). Ensure the input voltage of every component, and then check the part that is suspected damaged.

o If this problem occurs repeatedly, check the surrounding diagram and connections of panel inverter board. Also, the

blacklight unit and LCD lamps should be checked out.

There exists afterimages after power off

• If the panel can work normally at the other time, it may be caused by bad mainboard. Upgrade to the latest software first, if that does not work, attempt to change the mainboard.

There exists squeak when TV is working

e IListen to the squeak carefully to make sure where the noise comes from. If it is from speakers, the voice may be caused by

bad speakers. Change them for a try..

• If the noise comes from the inner parts of cabinet, it may be produced by abnormal AC current in power board. Change the board and check its surrounding circuits for a try.

• Check the routing of wires inside the cabinet to suppress interference.

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4.2 Troubleshooting for Displaying

Note: If the troubleshooting given below can not help you, change the LCD panel for a try. But we strongly suggest you

regard changing the panel as the last step of fixing the display problem.

No display (including white screen, black screen, etc.)

• Check the power board output and main board input ports to make sure whether the TV has been turned on successfully, because the failure in power on can lead to a no-display problem.

o If it is proved to have been electrified and turn on, check the LVDS cable first.

• Check if both of the two plugs of the flat cable between mainboard and power board have been well inserted into the slots. Unstable power supply can also cause serious display problem.

• If the display problem only happens in one input mode, that may be caused by wrong version software. Update the new software. If that can't help, change the main board for a try.

Screen tearing, or there exists moire on screen

• Bad LVDS cable and inappropriate panel driving voltage is still the biggest factor of this problem. So check them first.

e If the cable and voltage are correct, update the software for a try. o Sometimes the fastening pieces can make unproper pressure to LCD panel, check them out.

• If the screen tearing happens in one or several input sources while the other source can display normally, it can be caused by bad mainboard most likely. Please change the mainboard for a try.

• Refer to chapter 5 for more details and resolution ways.

Straight darWlight line(s) on screen

• If the bad line is very narrow, it is usually caused by LCD panel malfunction, change the panel for a try.

• If the lines link together and become a bad band, upgrade the software and then check the ports abd circuits of broken-

down output mode(s).

e If the darWlight line ,or band, apprears in all the input modes, please change the LCD panel. But we suggest you check the

panel inlet board(which links the panel and mainboard though LVDS cable) first, because sometimes the liquid crystal displaying unit is okay, while the inlet board has a transmitting problem, which also will lead to a displaying failure.

• Refer to chapter 5 for more details and resolution ways.

Color cast or interference

• If the cast or interference happens in only one input mode, check the output port(on mainboard) and transmitting network (arround mainboard) of that mode.

• If the cast or interference happens in all the input modes, please exclude the malfunction according to easy troubleshooting for No Display. If that can not help, refer to chapter 5 for more details and resolution ways. In addtion, most of this kind of problems come from the bad mainboards.

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4.3 Troubleshooting for Audio

Note: Comparing with the display problem, the audio malfunctions are easier to work out. Constantly, if you have excluded the possibility of bad speakers and bad connection of audio output, the problem generally comes from the audio processing parts of mainboard. Please change mainboard for a try, or refer to chapter 5 for further information about repairing.

No Sound

o Check whether the speakers are broken first.

o Check the wire that links the mainboard and speakers. Watch if there is fracture or cladding material breakage.

• Check the joint of speakers and audio wire, watch if there is poor soldering or fake solder. Besides, the polarity mistake can also lead to audio problem.

Volume too low

o Check whether there is a jam at the sound hole in front cabinet.

• Check whether one or more speakers are bad.

Sound channel loss or confounding

• Check whether the audio wires are installed reversedly. The left channel wire should be white and the right channel wire is red.

• Check the audio output socket of mainboard to see whether it is wrongly inserted. If not, the mainboard audio output module may be bad, refer to chapter 5 for more details and resolution ways.

• If the connection is stable and right, the mainboard audio output module may be bad, refer to chapter 5 for more details and resolution ways.

Noise

o Check ifthere is anything should not exist in the speaker hollow space (such as screws).

• Check ifthe antihunting EVA is broken or missing.

• Check ifthe speakers are bad.

4.4 Troubleshooting for Keyboard

No key can work

e Check the wire between mainboard and keyborad, watch if there is fracture or cladding material breakage.

• Check the joint of mainboard and keyboard wire, watch if there is poor soldering ofrfake solder.

• Check the resistances that locate on the keyboard PCB. Watch if there is wrong or broken ones. Also, the poor soldering of fake solder should be concerned and checked carefully.

o Check the other components of keyboard(such as capacitances and microswithes) are wrong or bad.

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Keys are sunken

• Check the screws that fasten the keyboard to the cabinet. They may be lost or getting loose.

• The key set may be bad, change them.

There is a reacting delay when operating the keys

o That is usually caused by bad keyboard, change it for a try.

Functions of keys are out of order

o Check the keyboard to see whether there is a short circuit between each soldering joint.

• Check all the resistances on PCB board.

o If a key is supposed to be able to achieve more than one functions, but it can achieve not all of them, that is usually

caused by wrong software. Please update the latest and correct software for a try.

• If you can't ensure where the problem comes from, change the keyboard for a try. If that still can't help, refer to chapter 5 for more details and resolution ways.

4.5 Troubleshooting for Remote Control

Note: If the troubleshooting can not help, please change the RC board. If that still can't solve the problem, please refer to chapter 5 for more details and resolution ways with a will to mainboard repairing.

The RC (remote control, the same below) does not work

• Check the wire between mainboard and RC board, watch ifthere is fracture or cladding material breakage.

• Check the joint of mainboard and RC board wire, watch if there is poor soldering or fake solder. Also, the short circuit can lead to this problem, too.

o Check the infrared senser that locates on the keyboard PCB. Watch if it is wrong or broken. Also, the poor soldering of

fake solder should be concerned and checked carefully.

• Check the other components of RC board are wrong or bad.

The LCD displays light in wrong color

• The short circuit is the most probable causation factor of this proble. Check the wire and joints for a judgement.

• Check the cable that links mainboard and RC board, watch if it is inserted with wrong location(similar with left-right channel wire fault for audio).

o Check the LCD assembling, watch if its pins are in wrong location.

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