JVC LM-17G Service Manual

SERVICE MANUAL

LCD VIDEO MONITOR

LM-17G LM-17G LM-17G

MENU/ENTER

INPUT SELECT

POWER

PCVIDEOBA

TABLE OF CONTENTS

1. PRECAUTIONS .......................................................................................................................................... 1-3

2. SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................... 1-6

3. DISASSEMBLY ........................................................................................................................................... 1-7

4. ADJUSTEMNT ...........................................................................................................................................1-11

5. TROUBLE SHOOTING .............................................................................................................................. 1-12

No.52164

2003/11

Items Contents

Type

Dimensions (W × H × D)

Mass

Color system

Scanning frequency

Power Input

Power consumption

LCD Panel

Display area

Display Pixels

Input/Output VIDEO A

terminals

VIDEO B

PC input

REMOTE INPUT

ASPECT

SPECIFICATION

LCD Video Monitor

40.2cm × 34.8cm × 6.9cm (Monitor only)

40.2cm × 34.9cm × 16.2cm (With supplied stand)

5kg (Monitor only)

5.8kg (with stand)

PAL / NTSC

H : 31.5kHz ~ 80kHz(PC) / 15.734kHz(NTSC) / 15.625kHz(PAL)

V : 56Hz

AC100V/AC240V, 50Hz/60Hz

45W

17-in, active matrix TFT

Visible size : 43.3cm(Diagonal) / 33.8cm × 27.0cm(H × V)

Horizontal : 1280 pixel × Vertical : 1024 pixel

Composite video, BNC connector ×2, 1V(p-p), 75Ω negative sync

(bridge connection possible, auto termination)

Composite video, BNC connector

(bridge connection possible, auto termination)

Analog RGB : D-sub(15 pin) ×1, positive 0.7 (p-p)

RCA pin ×1

~ 75Hz(PC) / 59.94(NTSC) / 50Hz(PAL)

2, 1V(p-p), 75Ω negative sync

NOTE: Design & specifications are subject to change without notice.

1-2 (No. 52164)

SECTION 1

PRECAUTION

1. 1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components

having such features are identified by shading on the schematics and by (!) on the parts list in Service manual. The use of a substitute replacement which does

not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( GND, the ISOLATED (NEUTRAL) : ( EARTH : (

) side GND. Don't short between the LIVE

) side GND and

side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.

(5) If any repair has been made to the chassis, it is

recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

(6) The high voltage applied to the picture tube must conform

with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.

) side

(8) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.

(9) Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an

appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000Ω/V, OR MORE SENSITIVITY)

0.15µF AC-TYPE

(7) Do not check high voltage by drawing an arc. Use a high

voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button.

GOOD EARTH GROUND

1500Ω 10W

PLACE THIS PROBE ON EACH EXPOSED ME TAL PA RT

(No. 52164) 1-3

1. 2 INSTALLATION

1.2.1 HEAT DISSIPATION

If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.

front side Note

wall

20cm

1.2.2 INSTALLATION REQUIREMENTS

Ensure that the minimal distance is maintained, as specified below, between the unit with and the surrounding walls, as well as the floor etc. Install the unit on stable flooring or stands. Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.

Use the metal fittings of the exclusive use option.

1.Hang on the wall

2.Hang from the ceiling

3.Put on the table

10cm

front

wall

20cm

10cm

front wall

10cm

front

wall

10cm

front

wall

Install has to be done by professional construction trader

Please confirm the structure and the strength of the wall to install beforehand. It attempts accident prevention and safe securing .

Install on the fixed floor and the stand.

To prevent from an accident and for the safe securing of an earthquake and so on, please process for tumble prevention.

15cm

5cm

15cm

1.2.3 FALL TIP PREVENTION MEASURES

Take precautionary measures to prevent the unit from falling or tipping to protect against emergencies such as earthquakes as well as accidents. Attach the supplied stand to the monitor as shown, and then fix it with the screws. Please fix the stand with the supplied screw (A) first, and then fix it with the screws (B).

1-4 (No. 52164)

10cm

1.3 PRECAUTIONS

(1) Depending on the around temperature, the brightness leaning occurs. Be careful of the environment in the product

installation place and so on sufficiently.

(2) Don't hinder radiation from the back, the heaven and the side. Please refer to the next page that explains about the

condition of the installation.

The inside becomes hot if hindering radiation and there is fear, which the inner circuit damages. (3) Install in the place with good ventilation. Use in the condition that around temperature is in the 0~35°C range. (4) Avoid preservation and use at the high temperature or high humidity place. If you behave like this, leaning sometimes

happens in the screen when the set actives. (5) Depending on the condition and the environment of display, the slight fleck of the light and leaning of the screen and so on

is sometimes conspicuous. This is the characteristic which is peculiar to liquid crystal display. It is not set trouble. (6) This monitor has cool cathode pipe as the backlight. The time change and the use time sometimes change brightness

and condition of display.

1.4 THE ATTENTION IN TRANSPORTATION

When transporting a set, if the load handling is bad (throwing, falling and so on) however it is using a solid box, pressure inside liquid crystal display. In the case there is fear to break the liquid crystal display while transporting. To prevent from the accident or trouble while transporting, pay attention to choice of the transportation company sufficiently and also arrange for it in the delivery after the attention of the load handling is explained to the transportation company. This set is used glass for composing liquid crystal display. When carrying, pay attention not to add over vibration and impact sufficiently. Ensure that it is placed upright and not horizontally during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break. During transportation, ensure that the unit is loaded along the traveling direction of the vehicle, and avoid stacking them on one another. For storage, ensure that they are stacked in 2 layers or less even when placed upright.

(No. 52164) 1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 DESCRIPTION ABOUT LIQUID CRYSTAL PANEL

2.2.1 STRUCTURE OF LIGUID CRYSTAL PANEL

The Liquid Crystal Panel of this model is TFT Panel. The Print circuit board that consist of TFT array and the print circuit board adopted stripe shaped image element alignment are used. These two boards are mixed. The Liquid crystal is enclosed between two boards.

2.1.2 LONG RANGE AFTERIMAGE OF LIQUID CRYSTAL

The small amount of ion material has mixed a liquid crystal panel with the liquid crystal material in the manufacturing process. If ion material is piled up partially among the poles when the voltage is impressed among the poles, the brightness difference occurs and becomes a long-range afterimage If same picture is reflected for long time, such a long-range afterimage occurs. If the long-range afterimage occurs, we recommend that you reflect the single color image or moving picture and so on to restore.

2.1.3 THE DISPLAY REPLYING SPEED OF LIQUID CRYSTAL

Because the speed to display of Liquid crystal panel is slower than the speed of the CRT monitor, some of the moving picture cannot overtake to the speed to display and the image looks flowing is sometimes displayed. This is not trouble, but efficiency of Liquid Crystal.

2.1.4 THE EYESIGHT CORNER OF LIQUID CRYSTAL

The liquid crystal panel has the wide eyesight corner for which it is difficult to reverse brightness. The tint changes depending on the direction to see a screen. This is not trouble, but efficiency of Liquid Crystal.

2.1.5 THE PICTURE ELEMENT FAULT OF LIQUID CRYSTAL

The liquid crystal panel is composed of precise technique but all devices don't always work right.

2.2 ATTENTION ITEMS WHEN REPLACING PARTS

2.2.1 ATTENTION TO EXCHANGE THE LIQUID CRYSTAL PANEL

(1) The stillness electricity sometimes makes damage a liquid crystal panel. In liquid crystal panel exchange, do a measure

of the stillness electricity such as the earth band.

(2) A liquid crystal panel and back-light are made from glass. If you gain an impact to these materials, there is fear to damage.

So in case of treatment, be careful sufficiently.

(3) Fix with the screw after confirming that there is not a float to chassis base when exchanging liquid crystal panel.

After that reflect all the black signals and confirm that brightness leaning doesn't occur near the screw fixation part. When brightness leaning occurs, slacken a screw in the neighborhood until the brightness leaning is running-out.

(4) Fix the torque that installs a screw below 0.294Nm.

If you install at any more torque, the liquid crystal panel is transformed and sometimes damages.

(5) If you pull out or insert each connector when power is ON, it causes the trouble.

So pull out or insert each connector in the condition to have pulled out a power supply plug.

2.2.2 ATTENTION WHEN EXCHANGING THE MAIN PWB

To show the original efficiency of the MAIN PWB, pull out a heat think from the previous MAIN PWB and install it in the new PWB surely.

2.2.3 ATTENTION WHEN EXCHANGING THE FUSE

When exchanging the fuse, please use specified parts. After fuse exchange, confirm that insulater is set to the shield and insulate surely.

1-6 (No. 52164)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

CAUTION:

• Even with the power switch off, some parts of the unit

are live. Be sure to disconnect the power plug from the AC outlet before disassembly and reassembly.

• Remove the power cord.

3.1.1 REMOVING THE BASE

(1) Lie down the unit and let panel downward. (2) As shown in Fig.1, remove 2 screws [A] and loosen the

two spring screws on BASE.

(3) Slightly remove the BASE.

3.1.2 REMOVING THE FUNCTION COVER

• Remove the BASE.

(1) As shown in Fig.1, remove 5 screws [B]. (2) Shift the FUNCTION COVER toward BASE and raise

upward.

3.1.3 REMOVING THE MAIN PWB

• Remove the FUNCTION COVER.

(1) As shown in Fig.1, remove 4 screws [C]. (2) Slightly remove the MAIN PWB upward.

3.1.4 REMOVING THE POWER PWB

• Remove the FUNCTION COVER.

(1) As shown in Fig.1, remove 1 screw [D]. (2) As shown in Fig.1, remove 4 screws [E], and remove the

earth wire.

(3) Slightly remove the POWER PWB upward.

3.1.9 REMOVING THE CONTROL BRACKET

• Remove the FRONT COVER.

(1) As shown in Fig.1, remove 3 screws [M]. (3) Remove the CONTROL BRACKET upward.

3.1.10 REMOVING THE CONTROL BUTTON

• Remove the CONTROL BRACKET.

(1) As shown in Fig.1, remove 4 screws [N]. (2) Remove two CONTROL BUTTON downward.

3.1.11 REMOVING THE FRONT CONTROL 1 PWB AND THE FRONT CONTROL 2 PWB

• Remove the CONTROL BRACKET.

(1) As shown in Fig.1, remove 2 screws [P]. (2) Remove the FRONT CONTROL 1 PWB upward. (3) As shown in Fig.1, remove 2 screws [Q]. (4) Remove the FRONT CONTROL 2 PWB upward.

3.1.12 REMOVING THE BACK COVER AND THE TERMINAL BRACKET

• Remove the FUNCTION COVER.

• Remove the MAIN PWB

• Remove the POWER PWB

• Remove the INVERTER PWB

• Remove the BNC INPUT PWB

• Remove the FRONT COVER

• Remove the LCD PANEL.

• Remove the CONTROL BRACKET

(1) As shown in Fig.1, remove 4 screws [S]. (2) Remove the BACK COVER and the TERMINAL BRACKET.

3.1.5 REMOVING THE INVERTER PWB

• Remove the FUNCTION COVER.

(1) As shown in Fig.1, remove 3 screws [F]. (2) Slightly remove the INVERTER PWB upward.

3.1.6 REMOVING THE BNC INPUT PWB

• Remove the FUNCTION COVER.

(1) As shown in Fig.1, remove 2 screws [G]. (2) Slightly remove the BNC INPUT PWB upward.

3.1.7 REMOVING THE FRONT COVER

• Remove the BASE.

(1) Lie down the unit and let panel upward. (2) As shown in Fig.1, remove 4 screws [H]. (3) Slightly remove the FRONT COVER.

3.1.8 REMOVING THE LCD PANEL, THE LCD BRACKET (R) AND THE LCD BRACKET (L)

• Remove the FRONT COVER.

(1) As shown in Fig.1, remove 4 screws [J]. (2) Raise LCD PANEL upward. (3) As shown in Fig.1, remove 4 screws [K]. (4) Remove the LCD BRACKET (R) and the LCD BRACKET

(L).

(No. 52164) 1-7

PWB

BNC INPUT

BRACKET

TERMINAL

INVERTER PWB

POWER PWB

WIRE

EARTH

BASE

FUNCTION COVER

BACK COVER

MAIN PWB

LCD PANEL

LCD BRACKET

PWB

FRONT CONTROL1

BUTTON

CONTROL

PWB

1-8 (No. 52164)

FRONT CONTROL2

Fig. 1

BRACKET

CONTROL

FRONT COVER

3. 2 REPLACEMENT OF MEMORY IC

3.2.1 MEMORY IC

The memory is in the MAIN PWB. The MAIN PWB is only for reference. Avoid replacing individual parts. Replace entire unit only. When the microcomputer or the memory are out of order, exchange a MAIN PWB.

3. 3 USER SETTING

! PC mode

Setting item Setting range Setting value

BACK LIGHT 0 ~ 100 100

CONTRAST 0 ~ 100 50

H. POSITION 0 ~ 100 50

V. POSITION 0 ~ 100 50

COLOR TEMP.

H. OSD POSITION 0 ~ 100 50

V. OSD POSITION 0 ~ 100 50

REMOTE ON/OFF OFF

! Video mode (VIDEO A,B)

HIGH/NATURAL/LOW/USER

NATURAL

Setting item Setting range Setting value

BACK LIGHT 0 ~ 100 100

PICTURE 0 ~ 100 0

PHASE 0 ~ 45 23

CHROMA 0 ~ 100 80

ASPECT 4 : 3 / 16 : 9 4 : 3

COLOR TEMP.

LOW LIGHT ADJ. 0 ~ 255 20

SIGNAL LEVEL STD/AMP STD

H. OSD POSITION 0 ~ 100 5 0

V. OSD POSITION 0 ~ 100 50

AGC ON/OFF ON

REMOTE ON/OFF OFF

HIGH/NATURAL/LOW/USER

NATURAL

(No. 52164) 1-9

3.4 REPLACEMENT OF CHIP COMPONENT

3.4.1 CAUTIONS

(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.

3.4.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.

3.4.3 REPLACEMENT STEPS

1. How to remove Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with tweezers and remove the chip part.

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove the chip part.

Note :

After removing the part, remove remaining solder from the pattern.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

(4) Then solder leads B and C.

1-10 (No. 52164)

SECTION 4

ADJUSTMENT

The service manual does not describe ADJUSTMENT.

(No. 52164) 1-11

SECTION 5

TROUBLE SHOOTING

The service manual does not describe TROUBLE SHOOTING.

1-12 (No. 52164)

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan

(No. 52164)

Printed in Japan

WPC

LM-17G /U,

LM-17G /E,

LM-17G

STANDARD CIRCUIT DIAGRAMS

CONTENTS

USING P.W. BOARD ..................................................................................................................................................................... 2-1

SEMICONDUCTOR ........................................................................................................................................................................ 2-1

BLOCK DIAGRAM ......................................................................................................................................................................... 2-2

CIRCUIT DIAGRAMS ................................................................................................................................................................... 2-3

POWER PWB CIRCUIT DIAGRAM ...................................................................................................................................................... 2-3

MAIN PWB CIRCUIT DIAGRAM ........................................................................................................................................................... 2-5

FRONT CONTROL 1 PWB CIRCUIT DIAGRAM ................................................................................................................................ 2-17

FRONT CONTROL 2 PWB CIRCUIT DIAGRAM ................................................................................................................................ 2-17

BNC INPUT PWB CIRCUIT DIAGRAM ............................................................................................................................................... 2-17

INVERTER PWB CIRCUIT DIAGRAM ................................................................................................................................................ 2-19

PATTERN DIAGRAMS............................................................................................................................................................... 2-21

POWER PWB PATTERN .................................................................................................................................................................... 2-21

USING P.W. BOARD

POWER P.W. BOARD DA-5097613403

MAIN P.W. BOARD DA-5097624700

FRONT CONTROL1 P.W. BOARD DA-5098800661

FRONT CONTROL2 P.W. BOARD DA-5098800647

BNC INPUT P.W. BOARD DA-5098800646

INVERTER P.W. BOARD DA-5097672143

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW

E C

ECB

(G)(D)(S )

B OT TO M V I EW FR O NT V I EW T OP V I EW

OUT

IN OUTE

CHIP IC

BCE

FRONT VI EW

1 N

TOP VIEW

ECB

1 N

TOP VIEW

CHIP TR

(No. 52164) 2-1

BLOCK DIAGRAM

Inverter

PWB-0528-01

GM5020

Scaler

M170E6

LCD Panel

P010P004

THC63L

LVDS

VDM83A

24LC16B

EEPROM

Micro

W78E65P

Controller

3.3V

Regulator

DC Power

PWB-0636-01

VGA

Video

SAA7118

Video

JP3

BNC

PWB-0584-03-1

P601

Key

PWB-0584-03-2

No. 521642-2

P002 P009P001

P602

Key

/LED

PWB-0584-03-3

12V

P802

P003

Remote input

PWB-0480-05

100~240Vac

P103

S.M.P.S

PWM Controller

P801

ISOLATEDLIVE

MAIN PWB (3/6) P103

POWER PWB ASS'Y DA-5097613403

POWER PWB CIRCUIT DIAGRAM

CIRCUIT DIAGRAMS

No. 52164 2-3 2-4

No. 52164

+ 35 hidden pages