JVC LT-15B60SJ Service Manual

SERVICE MANUAL

WIDE LCD PANEL TELEVISION

YA306200510

LT-15B60SJ, LT-15B60SW

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

No.YA306

2005/10

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 48.9cm × 35.3cm × 18.3cm [Included stand]

48.9cm × 30.4cm × 6.2cm [TV only]

Mass 7.5kg [Included stand]

6.0kg [TV only]

Power Input DC12V

AC220 ~ 240V 50Hz

Power Consumption 41W (Standby: 3.0W)

TV RF System CCIR (B/G, DK, I, L)

Colour System PAL / SECAM / NTSC 3.58/4.43 [EXT only]

Stereo System A2 (B/G) / NICAM (B/G, I, L)

Receiving Frequency VHF

Intermediate Frequency

Colour Sub Carrier Frequency

Teletext System FLOF (Fastext level 2.5), WST(World Standard system)

LCD panel 15V-inch (4 : 3)

Screen Size Diagonal : 38.1cm (H: 30.4cm × V: 22.8cm) Display Pixels Horizontal : 1024 dots × Vertical : 768 dots (XGA)

Audio Power Output 3W + 3W(10% THD)

Speaker 3.3cm × 10.5cm × 2 Aerial terminal (VHF/UHF) F-type connector, 75Ω unbalanced, coaxial EXT-1 (Input / Output) 21-pin Euro connector (SCART socket ) × 1

EXT-2 (Input) S-Video

PC (RGB) Input D-sub 15pin × 1

PC AUDIO input 3.5mm stereo mini jack × 1 Headphone 3.5mm stereo mini jack × 1 Remote Control Unit RM-C1861 (AA/R6 dry cell battery × 2)

SECAM

47 MHz - 470 MHz

UHF

470 MHz - 862 MHz

VIF

38.9 MHz (B/G, I, L)

SIF

33.4 MHz (5.5MHz : B/G)

32.9 MHz (6.0MHz : I)

32.4 MHz (6.5MHz : L)

PAL

4.43 MHz

4.40625 MHz / 4.25MHz

NTSC

3.58 MHz / 4.43 MHz

TOP (German system)

Mini-DIN 4 pin × 1 Y: 1V (p-p), Positive (Negative sync provided), 75 Ω C: 0.286V (p-p) (Burst signal), 75 Ω

Video

1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack × 1

Audio

500mV (rms), High impedance, RCA pin jack × 2

R/G/B : 0.7V (p-p), 75Ω

HD / VD : 1V (p-p) to 5V (p-p), high impedance < Available signal > Horizontal : 30kHz - 57kHz Vertical : 50Hz - 72Hz [ Resolution : 640 pixels × 480 pixels(VGA), 800 pixels × 600 pixels(SVGA), 1024 pixels × 768 pixels(XGA) ]

Design & specifications are subject to change without notice.

1-2 (No.YA306)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]

(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 : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE 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) 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.

(6) 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 1000Ω 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 1000 /V, OR MORE SENSITIVITY)

0.15 F AC-TYPE

GOOD EARTH GROUND

1500 10W

PLACE THIS PROBE ON EACH EXPOSED ME TAL PAR T

(No.YA306)1-3

1.2 SAFETY PRECAUTIONS [FOR UK]

(1) The design of this product contains special hardware and 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 product 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 product have special safety-related characteristics. These characteristics are often

not evident from visual inspection nor can the protection afforded by them necessary 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,

high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

WARNING

(1) The equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (3) Repairs must be made in accordance with the relevant safety standards. (4) It is essential that safety critical components are replaced by approved parts. (5) If mains voltage selector is provided, check setting for local voltage.

1-4 (No.YA306)

1.3 INSTALLATION

1.3.1 HEAT DISSIPATION

If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. The temperature sensor that protects the unit will be activated when internal temperature exceeds the pre-determined level and power will be turned off automatically.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.

Ventilation hole

*Diagram differs from actual appearance.

1.3.2 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.

1.3.3 NOTES ON HANDLING

(1) WHEN TAKING UNIT OUT OF A PACKING CASE

When taking the unit out of a packing case, do not grasp the upper part of the unit. If you take the unit out while grasping the upper part, the LCD PANEL may be damaged because of a pressure. Instead of grasping the upper part, put your hands on the lower backside or sides of the unit.

(2) AS FOR PRESSING OR TOUCHING A SPEAKER

Be careful not to press the opening of the speaker in the lower part of the unit and around them since the decorative sheet on the surface of the openings may be deformed.

100 mm

*Diagram differs from actual appearance.

100 mm

50 mm

(No.YA306)1-5

1.4 HANDLING LCD PANEL

1.4.1 PRECAUTIONS FOR TRANSPORTATION

When transporting the unit, pressure exerted on the internal LCD panel due to improper handling (such as tossing and dropping) may cause damages even when the unit is carefully packed. To prevent accidents from occurring during transportation, pay careful attention before delivery, such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the LCD panel of this unit is made of glass and therefore fragile:

(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL

When transporting the LCD panel of the unit, use a special packing case (packing materials). A special packing case is used when a LCD panel is supplied as a service spare part.

(2) ATTACH PROTECTION SHEET TO THE FRONT

Since the front (display part) of the panel is vulnerable, attach the protection sheet to the front of the LCD panel before transportation. Protection sheet is used when a LCD panel is supplied as a service spare part.

(3) AVOID VIBRATIONS AND IMPACTS

The unit may be broken if it is toppled sideways even when properly packed. Continuous vibration may shift the gap of the panel, and the unit may not be able to display images properly. Ensure that the unit is carried by at least 2 persons and pay careful attention not to exert any vibration or impact on it.

(4) DO NOT PLACE EQUIPMENT HORIZONTALLY

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.

1.4.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)

(1) Avoid placing the unit under direct sunlight over a

prolonged period of time. This may cause the optical filter to deteriorate in quality and COLOUR.

(2) Clean the filter surface by wiping it softly and lightly with a

soft and lightly fuzz cloth (such as outing flannel).

(3) Do not use solvents such as benzene or thinner to wipe the

filter surface. This may cause the filter to deteriorate in quality or the coating on the surface to come off. When cleaning the filter, usually use the neutral detergent diluted with water. When cleaning the dirty filter, use water-diluted ethanol.

(4) Since the filter surface is fragile, do not scratch or hit it with

hard materials. Be careful enough not to touch the front surface, especially when taking the unit out of the packing case or during transportation.

1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS

Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.):

(1) Do not exert pressure on the front of the LCD panel (filter

surface). It may cause irregular COLOUR.

(2) Pay careful attention not to scratch or stain the front of the

LCD panel (filter surface) with hands.

(3) When replacing exterior parts, the front (LCD panel) should

be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).

1-6 (No.YA306)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

ZOOM

This function can change the screen size according to the picture aspect ratio.

OFF TIMER

This function can set the TV to automatically turn off after a set time.

2.2 21-PIN EURO CONNECTOR (SCART) : EXT-1

Pin No. Signal designation Matching value EXT-1

1 AUDIO R output 500mV(rms) (Nominal),, Low impedance Used (TV OUT)

2 AUDIO R input 500mV(rms) (Nominal),, High impedance Used (R1)

3 AUDIO L output 500mV(rms) (Nominal),, Low impedance Used (TV OUT)

4 AUDIO GND Used

5 GND (B) Used

6 AUDIO L input 500mV(rms) (Nominal),, High impedance Used (L1)

7 B input 700mV

8 FUNCTION SW

(SLOW SW)

9 GND (G) Used

10 SCL / T-V LINK Not used

11 G input 700mV

12 SDA Not used

13 GND (R) Used

14 GND (YS) Used

15 R / C input R : 700mV

16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75Ω Used

17 GND (VIDEO output) Used

18 GND (VIDEO input) Used

19 VIDEO output 1V

20 VIDEO / Y input 1V

21 COMMON GND Used

Low : 0V-3V High : 8V-12V, High impedance

C : 300mV

(P-P)

, 75Ω Used

(B-W)

, 75Ω Used

(B-W)

, 75Ω

(B-W)

, 75Ω

(P-P)

(Negative sync), 75Ω Used (TV OUT) (Negative sync), 75Ω Used

(P-P= Peak to Peak, B-W= Blanking to white peak)

[Pin assignment]

20 18 16 14 12 10 8 6 4 2

COLOUR SYSTEM

If the picture is not clear or no colour appears, change the current colour system to another colour system.

Used

Used (R)

21 19 17 15 13 11 9 7 5 3 1

(No.YA306)1-7

2.3 TECHNICAL INFORMATION

2.3.1 LCD PANEL

This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

2.3.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications Remarks

Displayed colour 16777216 colours 256 colours for R, G, and B

Brightness 450cd/m

Contrast ratio 400: 1

Response time 25ms

View angle Horizontally: 176°, Vertically: 176°

2.3.1.2 PIXEL FAULT

There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

 BRIGHT FAULT

In this pixel fault, a cell that should not light originally is lighting on and off. For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

 DARK FAULT

In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting. For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

 FLICKER FAULT

In the pixel fault, a cell that should light originally or not light originally is flashing on and off. For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.

1-8 (No.YA306)

2.4 BASIC OPERATION OF UOCIII SERVICE MODE

2.4.1 HOW TO ENTER THE UOCIII SERVICE MODE

(1) Press [MENU] key. (2) Press the [4], [7], [2] and [5] key, and UOCIII SERVICE

MODE screen will be displayed.

UOCIII SERVICE MODE SCREEN

GTV 3.2.1

000

EurAsia TVSub

00000000 00111100

01000000 01100100

11000101 01100100

00000000 01100100

2.4.2 HOW TO EXIT THE UOCIII SERVICE MODE Press [MENU] key to exit the UOCIII SERVICE MODE.

2.4.3 CHANGE AND MEMORY OF SETTING VALUE

 SELECTION OF SETTING MENU & ITEM

• [P +/-] key.

 CHANGE OF SETTING VALUE(DATA)

• [Volume +/-] key.

 MEMORY OF SETTING VALUE(DATA)

The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.

2.4.4 UOCIII SERVICE MODE SELECT KEY LOCATION

Number key

[P +/-]

05.01

[MENU]

[Volume +/-]

2.4.5 UOCIII SERVICE MODE SETTING ITEMS

Item

Setting items Function

No.

EurAsia TVSub

000

001 Init TV Sets the UOC default values

and turns the tv to Stdby

002 ISP Mode Sets the TV into ISP state. 0

003 DCXO DCXO crystal alignment 70

004 DCXO Auto Automatic DCXO frequency

alignment. When it is set to 1; UOC automaticaly calculates DCXO values and writes it to item number 3.

005 Rotation 31

006 Hor. Shift 32

007 HBL 0

008 WBF 4

009 WBR 8

010 WSS WSS (Wide Screen Sigan-

ling) enable

011 Gld-SCART 1

012 Col Fe Color Saturation adjustment

for RF input

013 Col AV1 Color Saturation adjustment

for Scart CVBS input

014 Col AV1S 32

015 Col AV2 Color Saturation adjustment

for AV CVBS input

016 Col AV2S Color Saturation adjustment

for for SVHS S-video input

017 BLOR 32

018 BLOG 32

019 RGB 14

020 YSECAM

021 YNTSC

022 YPAL "Y delay" setting. (PAL) (0-15) 8

023 YAV1

024 YAV2 "Y delay" setting. (FAV) (0-15) 4

025 YSVHS1 "Y delay" setting. (0-15) 4

026 YSVHS2

027 ACL 0

028 MUS 0

029 PWL 8

030 CB 0

031 BPS 0

032 FCO 0

PeakFreqPAL443

033

PeakFreqPALM

034

PeakFreqPALN

035

PeakFreqNTSC443

036

"Y delay" setting. (SECAM) (0-15)

"Y delay" setting. (NTSC) (0-15)

"Y delay" setting. (SCART) (0-15)

"Y delay" setting. (S-Video) (0-15)

Setting

value

05.01

(No.YA306)1-9

Item

Setting items Function

No.

PeakFreqNTSCM

037

PeakFreqSECAM

038

039 PeakFreqAV 1

040 Blackstretch 1

041 Bluestretch 0

042 Whitestretch 0

043 Transfer Rato 1

PeakRatioOvShot

044

045 Tint NTSC 31

046 OSO 0

047 FSL 0

048 HP2 0

049 SoftClipLevel 0

OP AUDIO CONFIG

050

051 OP BILING 1

052 OP HP 1

053 OP EQUAL 1

054 OP DOLBY 0

055 OP TRUSUR 0

056 OP DUB DBE 0

057 OP BBE 0

058 AVL-LEV AVL Level setting 1

059 AVL-WGT AVL Weight setting 1

060 AVL-MOD AVL Response Time setting 3

061 AVLE AVL enable/disable 1

062 LOUD-NA 5

063 LOUD-CH 1

064 BBE-CONT 7

065 BBE-PROC 7

066 OP CLIP 0

067 DEC-LEV

068 MONO-LEV FM Mono Prescale setting 23

069 NIC-LEV Nicam Str. Prescale setting 17

070 ADC-AM-L AM Mono Prescale setting 21

071 ADC-AV-L Scart/Line in Prescale setting 18

072 BGSCAL DEC 0

BGSCAL MONO

073

074 BGSCAL NIC 0

075 BGSCAL SAP 0

076 MSCAL DEC 0

077 MSCAL

MONO

078 MSCAL NIC 0

079 MSCAL SAP 0

080 LSCAL DEC 0

081 LSCAL MONO 0

FM German Str. Prescale setting

Setting

value

Item

Setting items Function

No.

082 LSCAL NIC 0

083 LSCAL SAP 0

084 E2D 0

085 FFI 0

086 CMUTE 1

087 PA-BA-VO 31

088 PA-TR-VO 15

089 PA-LM-VO 1

090 PA-ST-VO 5

091 PA-LO-VO 0

092 PA-B1-VO 21

093 PA-B2-VO 50

094 PA-B3-VO 55

095 PA-B4-VO 45

096 PA-B5-VO 34

097 PA-BA-MU 34

098 PA-TR-MU 39

099 PA-LM-MU 1

100 PA-ST-MU 5

101 PA-LO-MU 1

102 PA-B1-MU 52

103 PA-B2-MU 47

104 PA-B3-MU 29

105 PA-B4-MU 29

106 PA-B5-MU 45

107 PA-BA-TH 36

108 PA-TR-TH 34

109 PA-LM-TH 1

110 PA-ST-TH 5

111 PA-LO-TH 0

112 PA-B1-TH 47

113 PA-B2-TH 45

114 PA-B3-TH 42

115 PA-B4-TH 45

116 PA-B5-TH 42

117 AGC Speed AGC Speed setting 1

AGC Take over

118

119 OIF IF Demodulator Offset 32

120 IF IF Frequency 2

121 SVO 0

122 GD 1

123 BPB 0

124 BPB2 0

125 RGB-IN 1

126 DVD1-IN 0

AGC setting 27

Setting

value

1-10 (No.YA306)

Item

Setting items Function

No.

127 AV2-IN 1

128 DVD2-IN 0

129 AV1S-IN 0

130 AV1D-IN 0

131 AV2S-IN 1

132 CBVS-OUT 1

133 INCL-AV 0

134 TXT-ON 1

135 TXT-SPLIT 1

136 TXT-H-POS 11

137 TIM-REM 1

138 TIM-SLP 1

139 TIM-SW 1

140 TIM-OFF 1

141 TIM-SKP 1

142 TIM-RT 1

143 FM Radio 1

144 PWR-SAVING 1

145 PWR-PERF 3

146 PWR-REST 0

147 PWR-ONKEY 1

148 Factory Mode 0

149 CombFil Combfilter enable/disable 1

BlueBlackNoMute

150

151 ATS 1

152 EVG 0

153 DFL 0

154 XDT 0

155 AKB 1

156 OSVE 0

157 CL 10

158 LCD-BRT UOC Brightness 36

159 LCD-CON UOC Contrast 32

160 LCD-CON-FE RF Frontend Contrast adjust. 30

LCD-CON-AV1

161

LCD-CON-AV1S

162

LCD-CON-AV2

163

LCD-CON-AV2S

164

165 RBL 0

166 EGL 0

167 LPG 1

168 PGR UOC Red Contrast 32

169 PGG-CVBS

170 PGG-RGB

171 PGB UOC Blue Contrast 32

Scart CVBS Contrast adjust. 32

AV CVBS Contrast adjust. 32

S-Video input Contrast adjust. 32

UOC Green Contrast for CVBS input

UOC Green Contrast for RGB input

Setting

value

2.5 BASIC OPERATION OF PW SERVICE MODE

2.5.1 HOW TO ENTER THE PW SERVICE MODE

(1) Press [MENU] key. (2) Press the [4], [7], [2] and [6] key, and PW SERVICE

MODE screen will be displayed.

2.5.2 HOW TO EXIT THE PW SERVICE MODE Press [MENU] key to exit the PW SERVICE MODE.

2.5.3 CHANGE AND MEMORY OF SETTING VALUE

 SELECTION OF SETTING MENU & ITEM

• [FUNCTION /] and [FUNCTION /] key.

 CHANGE OF SETTING VALUE(DATA)

• [FUNCTION /] key.

 MEMORY OF SETTING VALUE(DATA)

The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.

2.5.4 PW SERVICE MODE SELECT KEY LOCATION

Number key

[MENU]

[FUNCTION ]

2.5.5 PW SERVICE MODE SETTING ITEMS

Setting menu Setting items

Submenu 1 UOC Hposition

ADC_Calibration

UOC_Calibration

Submenu 2 Init NVM

Initial APS

Submenu 3 Country

Language

Menu Background

Remote Control

[FUNCTION ]

(No.YA306)1-11

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

NOTE:

• Make sure that the power cord is disconnected from the outlet.

• Pay special attention not to break or damage the parts.

• When removing each board, remove the connectors as required.

• Taking notes of the connecting points (connector numbers) makes service procedure manageable.

• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.

3.1.1 REMOVING THE FOOT ASSEMBLY

(1) Remove the HINGE COVER. (2) Remove the 4 screws [A], then remove the FOOT

ASSEMBLY.

3.1.2 REMOVING THE BACK COVER

• Remove the HINGE COVER & the FOOT ASSEMBLY. (1) Remove the SOCKET DOOR. (2) Remove the 7 screws [B]. (3) Remove the BACK COVER toward you.

3.1.3 REMOVING THE AV JACK BRACKET

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [C]. (2) Remove the AV JACK BRACKET.

3.1.4 REMOVING THE AV JACK PWB

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER.

• Remove the AV JACK BRACKET. (1) Remove the 2 screws [D]. (2) Remove the AV JACK PWB.

3.1.5 REMOVING THE FRONT CONTROL PWB

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [E]. (2) Remove the FRONT CONTROL PWB with FUNCTION

BUTTON.

(3) Remove the FRONT CONTROL PWB from FUNCTION

BUTTON.

3.1.6 REMOVING THE MAIN PWB

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 7 screws [F]. (2) Remove the MAIN PWB.

3.1.9 REMOVING THE MAIN FRAME

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER.

• Remove the SCART BRACKET. (1) Remove the 4 screws [J]. (2) Remove the MAIN FRAME from the FRONT PANEL.

3.1.10 REMOVING THE LCD PANEL UNIT

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER.

• Remove the SCRAT BRACKET.

• Remove the MAIN FRAME. (1) Remove the 4 screws [K]. (2) Sightly raise the both sides of the LCD PANEL UNIT by

hand from the MAIN FRAME.

NOTE :

• Pay special attention not to break or damage on the LCD

PANEL face or frame.

• The LCD PANEL UNIT is fixed to the FRONT COVER (at the

back side) by using double-side adhesive tapes. To remove the LCD PANEL UNIT, remove the adhesive tape on the FRONT PANELslowly.

3.1.11 REMOVING THE SPEAKERS

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [L]. (2) Remove the SPEAKER from the FRONT PANEL. (3) Follow the same when removing the other hand speaker.

3.1.12 REMOVING THE LED PWB

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [M]. (2) Remove the LED PWB from the FRONT PANEL.

3.1.7 REMOVING THE INVERTER UNIT

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [G]. (2) Remove the INVERTER UNIT.

3.1.8 REMOVING THE SCART BRACKET

• Remove the HINGE COVER & the FOOT ASSEMBLY.

• Remove the BACK COVER. (1) Remove the 2 screws [H]. (2) Remove the SCART BRACKET.

1-12 (No.YA306)

INVERTER UNIT

SIDE AV DOOR

MAIN PWB

SCART BRACKET

LCD PANEL UNIT

MAIN FRAME

BACK COVER

SOCKET DOOR

HINGE COVER

AV JACK PWB

AV JACK BRACKET

LED PWB

D HANG METAL

SPEAKER

(X2)

FRONT CONTROL PWB

FUNCTION BUTTON

METAL HINGE BRACKET

FRONT PANEL

FOOT SUPPORT

FOOT ASSEMBLY

(No.YA306)1-13

+ 29 hidden pages

JVC LT-15B60SJ Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual