Sharp LC-32L407I Schematic

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LC-32L407I

SERVICE MANUAL

No. S40F6LC32L40M

LCD COLOUR TELEVISION

MODEL

In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.

CONTENTS

SAFETY PRECAUTION

IMPORTANT SERVICE SAFETY

PRECAUTION............................................................ i

PRECAUTIONS FOR USING LEAD-FREE

SOLDER ................................................................... ii

OUTLINE

MAJOR SERVICE PARTS ........................................iii

CHAPTER 1. SPECIFICATIONS

[1] SPECIFICATIONS .................................................1-1

CHAPTER 2. OPERATION MANUAL

[1] OPERATION MANUAL ..........................................2-1

CHAPTER 3. DIMENSIONS

[1] DIMENSIONS ........................................................3-1

CHAPTER 4. REMOVING OF MAJOR PARTS

[1] REMOVING OF MAJOR PARTS ...........................4-1

LC-32L407I

CHAPTER 9. SCHEMATIC DIAGRAM

[1] DESCRIPTION OF SCHEMATIC DIAGRAM.........9-1

[2] MAIN Unit...............................................................9-2

[3] POWER SUB Unit................................................9-12

[4] R/C, LED Unit.......................................................9-16

Parts Guide

CHAPTER 5. ADJUSTMENT

[1] ADJUSTMENT PROCEDURE ...............................5-1

CHAPTER 6. TROUBLESHOOTING TABLE

[1] TROUBLESHOOTING TABLE...............................6-1

CHAPTER 7. OVERALL WIRING/BLOCK DIAGRAM

[1] OVERALL WIRING DIAGRAM ..............................7-1

[2] SYSTEM BLOCK DIAGRAM .................................7-2

CHAPTER 8. PRINTED WIRING BOARD ASSEMBLIES

[1] MAIN Unit...............................................................8-1

[2] POWER SUB Unit..................................................8-3

[3] R/C, LED Unit.........................................................8-5

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used for after sales service only. The contents are subject to change without notice.

LC-32L407I

LC-32L400M

SAFETY PRECAUTION

Service Manual

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

BEFORE RETURNING THE RECEIVER (Fire &

All checks must be repeated with the AC cord plug connection reversed. (If necessary, a nonpolarized adaptor plug must be used only for the purpose of completing these checks.)

Any reading of 0.74 Vrms (this corresponds to 0.5 mA rms AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner.

Shock Hazard)

Before returning the receiver to the user, perform the following safety checks:

3. Inspect all lead dress to make certain that leads are not pinched, and check that hardware is not lodged between the chassis and other metal parts in the receiver.

4. Inspect all protective devices such as non-metallic control knobs, insulation materials, cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

5. To be sure that no shock hazard exists, check for leakage current in the following manner.

• Plug the AC cord directly into a 110-240 volt AC outlet.

• Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15 F capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to an earth ground.

• Use an AC voltmeter having with 5000 ohm per volt, or higher, sensitivity or measure the AC voltage drop across the resistor.

• Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TO EXPOSED METAL PARTS

DVM

AC SCALE

1.5k ohm 10W

0.15µF

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in LCD colour television have special safety-related characteristics.

These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc.

Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features

are identified by " " and shaded areas in the Replacement Parts List and Schematic Diagrams.

For continued protection, replacement parts must be identical to those used in the original circuit.

The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire or other hazards.

LC-32L407I

PRECAUTIONS FOR USING LEAD-FREE SOLDER

Employing lead-free solder

• “PWBs” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

Example:

Indicates lead-free solder of tin, silver and copper. Indicates lead-free solder of tin, silver and copper.

Using lead-free wire solder

• When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks.

As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40 C, we recommend you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.

Soldering

• As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 C which is higher than the conventional lead solder by 40 C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.

Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and off the power of the bit as required.

If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it.

When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.

• Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

PARTS CODE

ZHNDAi123250E BL J 0.3mm 250g (1roll) ZHNDAi126500E BK J 0.6mm 500g (1roll) ZHNDAi12801KE BM J 1.0mm 1kg (1roll)

PRICE RANK

PART

DELIVERY

DESCRIPTION

LC-32L407I

LC-32L400M

OUTLINE

Service Manual

MAJOR SERVICE PARTS

PWB UNIT

Ref No. Part No. Description

N B3KU3L47I1 DUNTKF537FM02, MAIN Unit

DUNTKF539FM02, N N RDENC2590TPZZ INVERTER Unit

B3KU3L47I2 DUNTKF538FM02, POWER SUB Unit

OTHER UNIT

Ref No. Part No. Description

N B3KU32L50 32” LCD Panel Module (R1LK315T3LA5BX)

N B3KU3L47I 32” LCD Panel Module (R1LK315T3LW70W) ALTERNATIVE

IC FOR EXCLUSIVE USE OF THE SERVICE

Ref No. Part No. Description Q'ty

IC508 RH-iXD169WJQZS IC, PC EDID 1

IC1503 RH-iXD170WJQZS IC, HDMI EDID 1

R/C - LED Unit

SERVICE JIGS

Ref No. Part No. Description Q’ty

N QCNW-L077WJQZ Connecting Cord, MAIN-LCD CONTROL (LW) 1 N QCNW-K814WJQZ Connecting Cord, POWER-INVERTER (PI) 1 N QCNW-J413WJQZ Connecting Cord, MAIN-SPEAKER (SP) 1

iii

LC-32L400M

CHAPTER 1. SPECIFICATIONS

[1] SPECIFICATIONS

LC-32L407I

Service Manual

Item

LCD panel

Resolution

Video Colour System PAL/SECAM/NTSC 3.58/NTSC 4.43/PAL 60

TV Function

Viewing angles H : 176º V : 176º

Audio amplifier

Speakers

Terminals Rear Antenna input

OSD language English/Simplified Chinese/Arabic/French/Portuguese/Russian/Persian/Thai/

Power Requirement AC 110_240 V, 50/60 Hz

Power Consumption 112 W (0.9 W Standby)

Dimensions

Weight

Operating Temperature 0°C_40°C

As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improvement without prior notice. The performance specification figures indicated are nominal values of production units. There may be some deviations from these values in individual units.

TV-Standard PAL: B/G, D/K, I SECAM: B/G, D/K, K/K

Receiving Channel

TV-Tuning System Auto Preset 99 ch

STEREO/BILINGUAL NICAM: B/G, I, D/K A2 stereo: B/G

INPUT 1

INPUT 2 S-VIDEO in, VIDEO in, AUDIO in

INPUT 3 VIDEO in, AUDIO in

INPUT 4 AUDIO in, COMPONENT in (480I, 576I, 480P, 576P, 720P/50Hz, 720P/60Hz,

INPUT 5 (PC input)

RS-232C 9 pin D-sub male connector

without stand

with stand

without stand 10.0 kg

with stand 11.0 kg

Model

VHF/UHF 44.25_863.25 MHz

CATV S1_S41ch (including Hyperband)

LC-32L407I

32" (800 mm) Advanced Super View & BLACK TFT LCD

1,049,088 pixels (1366 768)

NTSC: M

5W 2

9 5 cm 2pcs

UHF/VHF 75 DIN type

HDMI (HDMI input) (480I,576I, 480P, 576P, 720P/50Hz, 720P/60Hz, 1080I/50Hz, 1080I/60Hz), AUDIO in ( 3.5 mm jack)

1080I/50Hz, 1080I/60Hz)

15 pin mini D-sub, AUDIO in (common use with INPUT 1) (

Vietnamese/Indonesian

797 (W) 535 (H) 115 (D) mm

797 (W) 580 (H) 262 (D) mm

3.5 mm jack)

1 – 1

LC-32L407I

LC-32L400M

CHAPTER 2. OPERATION MANUAL

[1] OPERATION MANUAL

Part names

TV (Front)

TV (Rear)

ANALOGUE RGB (PC)

Service Manual

OP C s ens or

R emote control s ensor

POWER indicator

Light off Power off

Lighted (Red) The TV is in standby mode.

Lighted (Green) The TV is on.

1 POWER (On/Off) button 2MENUbutton 3 TV/VIDEO button 4 Channel up ( )/down ( ) buttons 5 Volume up ( )/down ( ) buttons 6 Antenna input terminal 7 INPUT 5 (PC) terminals* 8 INPUT 1 (HDMI) terminal* 9 RS-232C terminal

10 SERVICE ONLY terminal** 11 INPUT 2 terminals 12 INPUT 3 terminals 13 INPUT 4 terminals

* The INPUT 1 and INPUT 5 terminals can both use the same audio input terminal. However, the proper item must be

selected in the "PC Audio Select" menu.

**Usually do not connect anything to this terminal as it is reserved only for service personnel.

The illustrations in this operation manual are for explanation purposes and may vary slightly from the actual operations.

2 – 1

Remote control unit

3 4 5

1 (Mute)

Press Mutes sound. Press again Restores sound.

Mute will be cancelled after 30 minutes. However, the TV will not suddenly output loud sound as the volume level will be set to 0 automatically. Increase the volume level by pressing VOL

20_9

Set the channel. TELETEXT mode: Set the page.

3 (Flashback)

Press to return to the previous selected channel

or external input mode.

4WIDE

Change the wide image mode.

5 VOL /VOL

Set the volume. (VOL ) Increase the volume. (VOL ) Decrease the volume.

6 FREEZE

Freeze a motion picture on the screen.

10 11 12

13 14

15 16

17 18

7 EXIT

Return to the default screen.

8 Colour (Red/Green/Yellow/Blue)

TELETEXT mode: Select a page.

9 POWER (STANDBY/ON)

To switch the power on and off.

10 DISPLAY

Display the channel or input information.

11 SLEEP

Set the Sleep timer.

0hr.30min. 1hr.00min.

Off

2hr.30min.

12 AV MODE

Select an audio and video setting.

13 MPX

Select the sound multiplex mode.

14 TV/VIDEO (INPUT SOURCE)

Select an input source.

15 CH /CH

TV input mode: Select the channel. (CH ) Increase the channel number. (CH ) Decrease the channel number. TELETEXT mode: Select the page.

16 PC

Directly select the PC terminal.

17 MENU

Display the menu screen.

18 / / / (Cursor)

Select a desired item on the setting screen.

ENTER

Execute a command.

19 RETURN

MENU mode: Return to the previous menu screen.

20 (TELETEXT)

Select the TELETEXT mode. (all TV image, all TEXT image, TV/TEXT image)

(Reveal hidden for TELETEXT)

TELETEXT mode: Display hidden characters.

(SUBTITLE for TELETEXT)

To turn the subtitles on and off.

(Hold)

TELETEXT mode: Stop updating Teletext pages automatically. Press again to release the hold mode.

(Subpage)

Display the Teletext subpage directly when in Teletext mode.

(Top/Bottom/Full)

TELETEXT mode: Set the area of magnification.

1hr.30min.

2hr.00min.

LC-32L407I

Inserting the battery

Before using the TV for the first time, insert a "AA" size battery (supplied). When the battery become depleted and the remote control fails to operate, replace the battery with new "AA" size battery.

Open the battery cover.

CAUTION

Battery (battery pack or batteries installed) shall not be exposed to excessive heat such as sunshine, fire or the like.

Insert the supplied "AA" size battery.

Place battery with their terminals corresponding to the ( ) and ( ) indications in the battery compartment.

Close the battery cover.

2 – 2

LC-32L407I

Attaching the stand

Before attaching (or detaching) the stand, unplug the AC cord from the AC outlet. Before performing work spread cushioning over the base area to lay the TV on. This will prevent it from being damaged.

Confirm the screws supplied with the TV.

Screws ( 4)

(usedinstep3)

Insert the stand base to the stand post on the bottom of the TV. ( )

Insert and tighten the 4 screws into the 4 holes on the bottom of the stand base. ( )

NOTE

To detach the stand, perform the steps in reverse order.

Soft cushion

Screw

Screw driver

2 – 3

Unit: mm

LC-32L400M

CHAPTER 3. DIMENSIONS

[1] DIMENSIONS

LC-32L407I

Service Manual

3 – 1

LC-32L407I

LC-32L400M

CHAPTER 4. REMOVING OF MAJOR PARTS

Service Manual

[1] REMOVING OF MAJOR PARTS

1. Removing of the Stand and Back Cover

1. Detach the Stand Hinge Cover [1].

2. Remove the 4 lock screws [2] and detach the Stand.

3. Remove the 1 lock screw [3], 1 lock screw [4], 1 lock screw [5], 6 lock screws [6] and detach the Back Cover.

Back Cover

Stand

Stand Hinge Cover

4 – 1

2. Disconnect the connectors

1. Disconnect the connectors from the MAIN Unit, POWER SUB Unit [1].

MAIN Unit

LC-32L407I

POWER SUB Unit

4 – 2

LC-32L407I

3. Removing of the MAIN Unit and POWER SUB Unit

1. Remove the 2 lock shafts [1], 2 lock shafts [2], 2 lock screws [3] and detach the MAIN Unit.

2. Remove the 5 lock screws [4] and detach the POWER SUB Unit.

MAIN Unit

POWER SUB Unit

4 – 3

4. Removing of the Rear Cabinet

1. Remove the 7 lock screws [1] and detach the Rear Cabinet.

LC-32L407I

Rear Cabinet

4 – 4

LC-32L407I

5. Removing of the Speaker and R/C, LED Unit

1. Disconnect the connectors from the INVERTER Unit and LCD Panel Module [1].

2. Disconnect SP connectors [2]. Remove the 4 lock screws [3] and detach the Speaker, remove the 2 Speaker rubber [3a] and 2 Molt Plane [3b].

3. Detach the R/C, LED Unit [4] and disconnect RA connector [5].

LCD Panel Module

LVDS

INVERTER Unit

R/C, LED Unit

Speaker

4 – 5

6. Removing of the Top Bracket, Bottom Bracket and LCD Panel Module

1. Remove the 4 lock screws [1].

2. Remove the 6 lock screws [2] and detach the Top Bracket, Bottom Bracket.

3. Remove the 2 lock screws [3] and detach the LCD Panel Module.

Top Bracket

LC-32L407I

LCD Panel Module

Bottom Bracket

4 – 6

LC-32L407I

LC-32L400M

CHAPTER 5. ADJUSTMENT

Service Manual

[1] ADJUSTMENT PROCEDURE

1. Entering and cancel the adjustment process mode

While holding down the TV/VIDEO and Volume DOWN keys at the same time, plug in the AC cord to turn on the power. (“K123” standing for

inspection process mode is displayed on the middle right section of the screen.)

Press the Channel DOWN and Volume DOWN keys at the same time. (The adjustment process mode screen appears.)

To cancel it, turn off the power using the Power switch or remote control.

2. Remote controller key operation and description of display in adjustment process mode.

1. key operation

Remote controller key Main unit key Function

CH ( / ) VOL (+ / –) VOL (+ / –) Changing volume (UP/DOWN) Cursor ( / )

Cursor ( / ) TV/VIDEO button on remote controller ENTER —————— ——————

CH ( / )

—————— Turning a page (PREVIOUS/NEXT) —————— Changing a selected line setting (+10/-10)

TV/VIDEO button Input source switching (toggle switching)

Changing channel (UP/DOWN)

(T V-DAV-1/SAV-1 AV- 2 COMPONENT HDMI PC)

* Input mode is switched automatically when relevant adjustment is started so far as the necessary input signal is available.

3. Signal adjustment

3.1. Signal check

Confirmation of signal from generator (setting to spec level)

PAL Composite signal : 0.7Vp-p 0.02Vp-p (Pedestal to white level) 15K Component signal (50Hz) : Y level:

Pb, Pr level:

33K component signal : Y level:

Pb, Pr level:

3.1.1 PROCESS MODE

Adjustment item Adjustment conditions Adjustment procedure

1 Adjustment mode 1) Press the test key at the test remote control.

*On double screen models, the tuner, composite signal and component signal adjustment are made for their single screen mode and double screen mode as well.

3.1.2 Component 15K 50Hz signal adjustment (COMP-SD)

Adjustment item Adjustment conditions Adjustment procedure

1 Adjustment [Signal]

COMP 15K 50Hz (576i) 100% Full-field Colour Bar

[Terminal] INPUT 4 COMPONENT

0.7Vp-p 0.02Vp-p (Pedestal to white level)

0.7Vp-p 0.02Vp-p

0.7Vp-p 0.02Vp-p (Pedestal to white level)

0.7Vp-p 0.02Vp-Com

Feed the COMPONENT 15K 50Hz (576i) 100% Full-field Colour Bar signal (100% colour saturation) to INPUT 4 COMPONENT terminal.

2 Auto adjustment

performance

Process Mode page 4 (COMP SD)

100% white Black

1) At the related page, move cursor to [COMP SD ADJ], press ENTER.

2) [OK] appears when finished.

5 – 1

3.1.3 Component 33K 60Hz signal adjustment (COMP-HD)

Adjustment item Adjustment conditions Adjustment procedure

1 Adjustment [Signal]

COMP 33K 60Hz (1080i) 100% Full-field Colour Bar

[Terminal] INPUT 4 COMPONENT

Feed the COMPONENT 33K 60Hz (1080i) 100% Full-field Colour Bar signal (100% colour saturation) to INPUT 4 COMPONENT terminal.

100% white Black

LC-32L407I

2 Auto adjustment

performance

Process Mode page 5 (COMP HD)

1) At the related page, move cursor to [COMP HD ADJ], press ENTER.

2) [OK] appears when finished.

3.1.4 PC (ANALOG RGB) signal adjustment (PC-RGB)

Adjustment item Adjustment conditions Adjustment procedure

1 Adjustment [Signal]

XGA 60Hz 100% Checkered Pattern

[Terminal] PC INPUT

2 Auto adjustment

performance

Process Mode page 6 (PC-RGB)

Feed the XGA 60Hz 100% Checkered pattern signal (100% colour saturation) to PC INPUT. *Please make sure SYNC is OFF.

1) At the related page, move cursor to [RGB ADJ], press ENTER.

2) [OK] appears when finished.

5 – 2

LC-32L407I

Level

Spec Data

Adjustment

Spec.

Inspection

Spec.

Point 2

ref.

values

Point 1

ref.

values

204

128

x=0.272 y=0.277

0.0010

0.0045

0.0020

0.0090

3.2. White balance adjustment

Adjustment item Adjustment conditions Adjustment procedure

1 Adjustment Brightness : MAX

Set the luminance meter on the center of the screen

For the details of white balance adjustment procedure, please refer to white balance adjustment spec for current model.

1) Confirm the set condition.

2) Connect the luminance meter CA-210.

3) Through RS-232C command, adjustment mode screen is displayed.

2 Auto Adjustment

performance

[command] Adjustment Mode KRSW0001 KKT10037

Setting KYOF0001 OSDS0001 SBSL0016

Multi point adj. Mode MSET0001

Point 2 LEV20204 WBI20204 MG2G**** MG2B**** MG2R****

Point 1 LEV10128 WBI10128 MG1G**** MG1B**** MG1R****

Write MSET0003

[Adjustment Procedure]

1) Using the remote control, set the LCD TV to adjustment mode.

2) Set the specified gradation for point 2, fix the most faint colour to get reference value, adjust others 2 colour to minus adjustment for reference value of point 2.

3) Set the specified gradation for point 1. Set G of point 1 to the default value [(2048xG value of point 2/3264), with fractions rounded] and adjust RB to the reference value of point 1.

4) Adjusted value is writing at [command] MSET0003, and then shut down the AC power.

*Initial value at RGB 2 point : 3264 *Initial value at RGB 1 point : 2048

[Adjustment Value]  Specification data by engineering dept is set as reference.

[Reference value for adjustment reference] Equipment: Luminance meter [Minolta CA-210]

Ref. : For inspection, set the LCD TV as below.

AV MODE: [DYNAMIC] (Reset) Monochrome: ON Aging Time: Minimum 60 minutes

4. Factory setting

AC power is plug off after shipment setting is done.

CAUTION: Do not plug on again after shipment setting is done. If do, please re-do the shipment setting. Do not off with remote control.

Adjustment item Adjustment condition Adjustment procedure

Factory setting AC power off to exit the fac-

tory setting.

1) Setting is done with test remote control.

2) When Green background appears on screen and “K” mark disappears, setting is completed.

The followings are initialized to factory setting

1) User setting

2) Channel data (e. g. broadcast frequencies)

3) Manufacturer’s option settings

4) Password data

5) Setting values are set based on model destination

5 – 3

5. Software upgrading

Do not power off Chip programming >>>>>>>>

1) Plug off the LCD TV.

2) Insert the USB device to the USB terminal at the LCD TV.

(Make sure that latest software is installed in the USB device)

3) Hold the LCD TV power key and plug on the LCD TV.

4) LCD TV is on and detecting the USB device.

USB device found

5) A few seconds later, the software upgrading will start automatically.

LC-32L407I

6) Let the process running & entering verification.

Verifying

Verified

7) Software is successfully installed when the following appears at the end of the process.

Please re-boot the system Update Finished

8) Plug off the LCD TV & plug on again as usual.

9) LCD TV is running with the latest software.

5 – 4

LC-32L407I

LC-32L400M

CHAPTER 6. TROUBLESHOOTING TABLE

Service Manual

[1] TROUBLESHOOTING TABLE

No power (front LED failure to light up) or no startup (front LED failure to turn from red to green)

Is the AC cord connector tightly connected to the set? NO Reconnect the AC cord tightly and turn on the power again.

YES Is the output voltage at pin (7), (8), (9) and (10) of P5201 (13.0V line) as specified?

YES Are the wire harnesses and other cables properly connected in

the set?

YES Is there the AC_DET and PNL_ON signal input at pins (14) and (1) of P5201?

NO Replace the power unit.

NO Reconnect the wire harnesses and other cables properly in the

set.

NO Check the AC_DET signal line PNL_ON signal line.

YES Are the DC/DC converter outputs and the output voltages along the control lines as specified?

1) B1.26V (IC9606)

2) D2.6V (IC9603)

3) STB+3.3V (IC9602)

4) D3.3V (IC9653)

5) B5V (IC9652)

NO Check the DC/DC converters and the control lines. Replace

defective parts as required.

6 – 1

With [RF] signal input No video onscreen (1)

No video in the UHF/VHF reception

Is there IF output from the tuner pin(12) of TU1101 as specified? NO Check TU1101 and its peripheral circuits.

YES Is there VIF input at pin 57 & 58 of IC3301? NO Check the circuit between TU1101 & IC3301.

YES Are there the signal outputs of IC3301? NO Check IC3301 and its peripheral circuit.

YES Check LVDS cable, LCD controller (incl. panel) and their periph-

eral circuits.

With <Video> signal input No video onscreen (2)

LC-32L407I

No external input video onscreen <INPUT 2>

Is INPUT 2 selected on the input select menu screen? NO Select INPUT 2 on the input select menu screen to pick up the

right input signal.

YES Is there the video signal input at pin (33) of IC3301? NO Check the line between pin (3) of J5510 and pin (33) of IC3301.

YES Are there signal outputs of IC3301? NO Check IC3301 and its peripheral circuits.

YES Check LVDS cable, LCD controller (incl. panel) and their peripheral circuits.

6 – 2

+ 49 hidden pages