NOBLEX 24LC834F Schematic

Liquid Crystal Display Television

Service Manual

Chassis： MST6E16JS

Product Type：LCD24V88APAM

Ver 1.0

Hisense Electric Co.，Ltd.

May， 2012

Contents

Contents................................................................................................................................................................- 2 -

Service Manual ....................................................................................................................................................- 2 -

1. Precautions and notices..............................................................................................................................- 3 -

1.1 WARNING ......................................................................................................................................- 4 -

1.2 NOTES ............................................................................................................................................- 7 -

2. Factory/Service OSD Menu and Adjustment...........................................................................................- 10 -

2.1 T o enter the Factory OSD Menu....................................................................................................- 10 -

2.2 Factory OSD Menu........................................................................................................................- 10 -

3. Software Upgrading.................................................................................................................................- 15 -

Before upgrading, read the following..................................................................................................- 15 -

3.1 Get ready for upgrading.................................................................................................................- 15 -

3.2 Upgrading with the ISP_TOOL4.0.9.............................................................................................- 25 -

3.3 USB Software upgrading...............................................................................................................- 29 -

4. Circuit instruction....................................................................................................................................- 34 -

4.1 Main board Power assign and block diagram................................................................................- 34 -

4.2 Image and signal process...............................................................................................................- 35 -

4.3 The main IC description ................................................................................................................- 41 -

4.4 Troubleshooting.............................................................................................................................- 49 -

4.4.1 Troubleshooting for Remote Control.................................................................................. - 49 -

4.4.2 Troubleshooting for Function Key......................................................................................- 50 -

4.4.3 TV won’t Power On............................................................................................................- 51 -

4.4.4 Troubleshooting for Audio..................................................................................................- 52 -

4.4.5 Troubleshooting for TV/VGA/HDMI input........................................................................- 53 -

4.4.6 Troubleshooting for YPbPr input........................................................................................- 54 -

4.4.7 Troubleshooting for V ideo/S-Video input...........................................................................- 55 -

5. Schematic circuit diagram.......................................................................................................................- 56 -

Service Manual

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1. Precautions and notices

BEFORE SERVICING THE LCD TV, READ THE SAFETY PRECAUTIONS IN

THIS MANUAL.

WHEN REPLACEMENT PARTS ARE REQUIRED, BE SURE TO USE

REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER.

Proper service and repair is important to the safe, reliable operation of all Hisense

Electric Co., Ltd Equipment. The service procedures recommended by Hisense and

described in this Service Guide 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. Hisense 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, Hisense has

not undertaken any such broad evaluation. Accordingly, a serviceman that uses a

service procedure or tools, which are not recommended by Hisense, must first satisfy

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himself thoroughly that neither his safety nor the safe of the equipment will be

jeopardized by the service method selected.

Hereafter throughout this manual, Hisense Electric Co., Ltd will be referred to as Hisense.

1.1 WARNING

1.1.1

Critical components having special safety characteristics are identified with a

the Ref. No. in the parts list. Use of substitute replacement parts, which do not have

the same specified safety characteristics, may create shock, fire, or other hazards.

Under no circumstances should the original design be modified or altered without

written permission from Hisense. Hisense assumes no liability, express or implied,

arising out of any unauthorized modification of design. Serviceman assumes all

liability.

DANGER CAUTION

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 GUIDE.

1.1.2.

All ICs and many other semiconductors are susceptible to electrostatic discharges

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(ESD). Careless handling during repair can reduce life drastically. When repairing,

make sure that you are connected with the same potential as the mass of the set by a

wristband with resistance. Keep components and tools also at this same potential.

1. Never replace modules or other components while the unit is switched on.

2. When making settings, use plastic rather than metal tools. This will prevent

any short circuits and the danger of a circuit becoming unstable.

1.1.3

To prevent electrical shock, do not use this polarized ac plug with an extension cord,

receptacle, or the outlet unless the blades can be fully inserted to prevent blade

exposure.

To prevent electrical shock, match wide blade or plug to wide slot, fully insert.

1.1.4

When replacement parts are required, be sure to use replacement parts specified by

the manufacturer or have the same characteristics as the original part. Unauthorized

substitutions may result in fire, electric shock, or other hazards.

1.1.5

Safety regulations require that after a repair the set must be returned in its original

condition. In particular attention should be paid to the following points.

-Note: The wire trees should be routed correctly and fixed with the mounted

cable clamps.

-The insulation of the mains lead should be checked for external damage.

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1.1.6

(1) Do not touch Signal and Power Connector while this product operates. Do not

touch EMI ground part and Heat Sink of Film Filter.

(2) Do not supply a voltage higher than that specified to this product. This may

damage the product and may cause a fire.

(3) Do not use this product in locations where the humidity is extremely high,

where it may be splashed with water, or where flammable materials surround it. Do

not install or use the product in a location that does no satisfy the specified

environmental conditions. This may damage the product and may cause a fire.

(4) If a foreign substance (such as water, metal, or liquid) gets inside the panel

module, immediately turn off the power. Continuing to use the product may cause

fire or electric shock.

(5) If the product emits smoke, and abnormal smell, or makes an abnormal sound,

immediately turn off the power. Continuing to use the product, it may cause fire or

electric shock.

(6) Do not disconnect or connect the connector while power to the product is on. It

takes some time for the voltage to drop to a sufficiently low level after the power

has been turned off. Confirm that the voltage has dropped to a safe level before

disconnecting or connecting the connector.

(7) Do not pull out or insert the power cable from/to an outlet with wet hands. It

may cause electric shock.

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(8) Do not damage or modify the power cable. It may cause fire or electric shock.

(9) If the power cable is damaged, or if the connector is loose, do not use the

product: otherwise, this can lead to fire or electric shock.

(10) If the power connector or the connector of the power cable becomes dirty or

dusty, wipe it with a dry cloth. Otherwise, this can lead to fire.

(11) Use only with the cart, stand, tripod, bracket, or table specified by the

manufacturer, or sold with the apparatus. When a cart is used, use caution when

moving the cart/apparatus combination to avoid injury from tip-over.

1.2 NOTES

Notes on Safe Handling of the LCD panel and during service

The work procedures shown with the Note indication are important for ensuring the

safety of the product and the servicing work. Be sure to follow these instructions.

• Before starting the work, secure a sufficient working space.

• At all times other than when adjusting and checking the product, be sure to turn

OFF the POWER Button and disconnect the power cable from the power source of

the TV during servicing.

• To prevent electric shock and breakage of PC board, start the servicing work at least

30 seconds after the main power has been turned off. Especially when installing and

removing the power board, start servicing at least 2 minutes after the main power has

been turned off.

• While the main power is on, do not touch any parts or circuits other than the ones

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specified. If any connection other than the one specified is made between the

measuring equipment and the high voltage power supply block, it can result in

electric shock or activation of the leakage-detection circuit breaker.

• When installing the LCD module in, and removing it from the packing carton, be

sure to have at least two persons perform the work.

• When the surface of the panel comes into contact with the cushioning materials, be

sure to confirm that there is no foreign matter on top of the cushioning materials

before the surface of the panel comes into contact with the cushioning materials.

Failure to observe this precaution may result in, the surface of the panel being

scratched by foreign matter.

• When handling the circuit board, be sure to remove static electricity from your body

before handling the circuit board.

• Be sure to handle the circuit board by holding the large parts as the heat sink or

transformer. Failure to observe this precaution may result in the occurrence of an

abnormality in the soldered areas.

• Do not stack the circuit boards. Failure to observe this precaution may result in

problems resulting from scratches on the parts, the deformation of parts, and

short-circuits due to residual electric charge.

• Routing of the wires and fixing them in position must be done in accordance with

the original routing and fixing configuration when servicing is completed. All the

wires are routed far away from the areas that become hot (such as the heat sink).

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These wires are fixed in position with the wire clamps so that the wires do not move,

thereby ensuring that they are not damaged and their materials do not deteriorate over

long periods of time. Therefore, route the cables and fix the cables to the original

position and states using the wire clamps.

• Perform a safety check when servicing is completed. Verify that the peripherals of

the serviced points have not undergone any deterioration during servicing. Also

verify that the screws, parts and cables removed for servicing purposes have all been

returned to their proper locations in accordance with the original setup.

The lightning flash with arrowhead symbol, within an equilateral

triangle is intended to alert the user to the presence of uninsulated

dangerous voltage within the products enclosure that may be of sufficient magnitude

to constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to

alert the user to the presence of important operating and maintenance

(servicing) instructions in the literature accompanying the set.

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2. Factory/Service OSD Menu and Adjustment

2.1 To enter the Factory OSD Menu

a. With factory RC (remote control)

1. Press “M” button and enter factory mode.

2. Press “Menu” button and enter factory OSD menu. 3 . Press “CH+”/“CH-” button select the function menu, press “VOL+”/“VOL-” enter the selected function menu. Press “VOL+”/“VOL-” button adjust values in the menu.

4. Press “M” button exit factory mode in the factory OSD menu. When TV outgoing factory,user can not enter factory OSD menu with Factory Remote

b. With user’s RC

1. Power TV On

2. Press Menu button and call up User OSD Menu

3. Select Sound-> Balance

4. When Balance value is “0”,Enter 0->5->3 ->2 in sequence.

Note: If necessary, re-do number keys.

5. Factory OSD appears.

6. Press the standby button then AC turn off and restart the TV, which can exit factory OSD menu.

2.2 Factory OSD Menu

The Factory OSD Menu comprises Factory Menu and Design Menu .

2.2.1、Factory Menu

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FACTORY MENU WHITE BALANCE ADC ADJUST LOGO OSD LANGUAGE COUNTRY OPTIONS FACTORY INIT TEST PATTERN VERSION NON STANDARD

ADC ADJUST

Only in component and VGA SOURCE ,The “ Can be chosen.

ADC Adjust”

WHITE BALANCE COL TEMP STANDARD

R CUT 128 G CUT 128 B CUT 128 R DRV 128 G DRV 128 B DRV 128

LOGO

NULL HISENSE WELCOME

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OPTION

SOURCE TV TOFAC M ATS 1 STARTUP MENU 1 Search Sensitive 1 RF NTSC 0 HDCP OUT OR IN 1

TEST PATTERN

TEST PATTERN NULL

FACTORY INIT

QINGDAO HUANGDAO HUNGARY FRANCE AUSTRALIA CLEAR PROTECTLY CLEAR UNPROTECTLY

VERSION

VERSION: PANEL TYPE: FLASH :

2.2.2、Design Menu

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DESIGN MENU

PICTURE MODE SOUND MODE PICTURE CURVE AUDIO CURVE SSC SETTING SAVING MODE

PICTURE MODE

MODE STANDARD BRIGHTNESS 50 CONTRAST 50 COLOUR 50

PICTURE CURVE MODE BRIGHTNESS CURVE 0 97 CURVE 25 105 CURVE 50 120 CURVE 75 130 CURVE 100 141

SOUND MODE

MODE USER 120HZ 10 500HZ 10

1.5KHZ 10 5KHZ 10 10KHZ 10

AUDIO CURVE MODE VOLUME CURVE 0 0 CURVE 25 18 CURVE 50 22 CURVE 75 28 CURVE 100 36

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SSC SETTING

DDR SSC 2 DDR MCM 60 LVDS SSC 2 LVDS PCM 60

SAVING MODE

255

Note：

The above “Factory/Service OSD Menu” are reference only, please refer to the actual units to determine the appearances.

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3. Software Upgrading

Before upgrading, read the following.

1、Before upgrading，Write down the ADC Calibration values of the channel of VGA and

component。

2、Upgrade the software. 3、To clear the EEPROM . A Select the item “Clear Unprotected”. B Press VOL+ button to clear the EEPROM data. C Close the OSD menu after 5 seconds. D Restart the TV. 4 Write the ADC Calibration values copied just now into the the channels of VGA and

component.

5、After the operation above all, necessarily, Renew search the channels for the users.

3.1 Get ready for upgrading

The software is upgraded by a burning tool- ISP_TOOL4.0.9, which can burn the

program file“*．bin” to the main board of the unit

3.1.1 Install the ISP_TOOL4.0.9-------only for the first time update.

1、 Port Setting：

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