Text preview for : JVC LCD Ch. FT3.pdf part of JVC LT-37A80SU, LT-37A80ZU, LT-37DA8BJ, LT-37DA8SU, LT-37DA8ZU Service Manual
Back to : JVC LCD Ch. FT3.part1.rar | Home
SERVICE MANUAL
LCD INTEGRATED DIGITAL TELEVISION
S
4 ERVICE MANUAL
2007
YA514
LT-37A80SU, LT-37A80ZU,
LT-37DA8BJ, LT-37DA8SU,
LT-37DA8ZU
BASIC CHASSIS
FT3
[A80 series] [DA8 series]
COPYRIGHT © 2007 Victor Company of Japan, Limited
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
COPYRIGHT © 2007 Victor Company of Japan, Limited No.YA514
2007/4
SPECIFICATION
Contents
Items LT-37A80SU LT-37DA8SU
LT-37DA8BJ
LT-37A80ZU LT-37DA8ZU
Dimensions ( W × H × D ) 91.9 cm × 65.2 cm × 23.0 cm [Included stand]
91.9 cm × 60.4 cm × 10.8 cm [TV only]
Mass 19.5 kg [Included stand] 19.8 kg [Included stand]
18.4 kg [TV only] 18.7 kg [TV only]
Power Input AC220V - AC240 V, 50 Hz
Power Consumption 161 W (Standby: 1.6 W) 170 W (Standby: 1.6 W)
TV RF System Analog CCIR (B/G, I, D/K, L) CCIR (I)
Digital --- DVB-T
Colour System PAL, PAL,
SECAM, NTSC 3.58/4.43 [EXT only]
NTSC 3.58/4.43 [EXT only]
Stereo System NICAM (B/G, I, D/K, L), A2 (B/G, D/K) NICAM (I)
Receiving Analog VHF: 47MHz - 470MHz UHF: 470 MHz - 862 MHz
Frequency UHF: 470 MHz - 862 MHz
CATV: 116MHz - 172MHz / 220MHz - 469MHz
Digital --- UHF:177.5 MHz - 858 MHz UHF:474 MHz - 850 MHz
Intermediate VIF 38.9MHz (B/G, I, D/K, L) 38.9MHz (I)
Frequency SIF 33.4MHz (5.5MHz :B/G) 32.9MHz (6.0MHz :I)
32.9MHz (6.0MHz :I)
32.4MHz (6.5MHz :D/K)
Colour Sub PAL 4.43MHz
Carrier SECAM 4.40625MHz / 4.25MHz ---
Frequency
NTSC 3.58MHz / 4.43MHz
Teletext System Analog FLOF (Fastext level 2.5) FLOF (Fastext level 2.5)
TOP WST(World Standard system)
WST(World Standard system)
Digital --- EBU TEXT MHEG 5 UK profile
LCD panel 37V-inch wide aspect (16 : 9)
Screen Size Diagonal : 92.0 cm (H: 82.2 cm × V: 46.3 cm)
Display Pixels Horizontal : 1366 dots × Vertical : 768 dots (W-XGA)
Audio Power Output 6W+6W 5W+5W
Speaker 4.0 cm × 16.0 cm, oval type × 2
Aerial terminal (VHF/UHF) 75 unbalanced, coaxial
EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) × 2
EXT-3 (Input) Component Video RCA pin jack × 3
750p / 1125i Y : 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75
Pb/Pr : ±0.35V(p-p), 75
625p / 525p / 625i / 525i Y : 1 V (p-p), Positive (Negative sync.), 75
Cb/Cr : 0.7V(p-p), 75
Audio 500 mV(rms) (-4dBs), high impedance, RCA pin jack × 2
EXT-4 / EXT-5 Video/Audio HDMI 2-row 19pin connector × 2
(HDMI Input) (Digital-input terminal is not compatible with picture signals of personal computer)
Digital Audio Optical Output --- Digital SPDIF × 1
Headphone 3.5 mm stereo mini jack × 1
Remote Control Unit RM-C1508 RM-C1821
(AA/R6 dry cell battery × 2) (AA/R6 dry cell battery × 2)
Design & specifications are subject to change without notice.
1-2 (No.YA514)
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]
(1) The design of this product contains special hardware, (6) Isolation Check (Safety for Electrical Shock Hazard)
many circuits and components specially for safety After re-assembling the product, always perform an
purposes. For continued protection, no changes should be isolation check on the exposed metal parts of the cabinet
made to the original design unless authorized in writing by (antenna terminals, video/audio input and output terminals,
the manufacturer. Replacement parts must be identical to Control knobs, metal cabinet, screw heads, earphone jack,
those used in the original circuits. Service should be control shafts, etc.) to be sure the product is safe to operate
performed by qualified personnel only. without danger of electrical shock.
(2) Alterations of the design or circuitry of the products should a) Dielectric Strength Test
not be made. Any design alterations or additions will void The isolation between the AC primary circuit and all metal
the manufacturer's warranty and will further relieve the parts exposed to the user, particularly any exposed metal
manufacturer of responsibility for personal injury or part having a return path to the chassis should withstand a
property damage resulting therefrom. voltage of 3000V AC (r.m.s.) for a period of one second. (.
(3) Many electrical and mechanical parts in the products have . . . Withstand a voltage of 1100V AC (r.m.s.) to an
special safety-related characteristics. These appliance rated up to 120V, and 3000V AC (r.m.s.) to an
characteristics are often not evident from visual inspection appliance rated 200V or more, for a period of one second.)
nor can the protection afforded by them necessarily be This method of test requires a test equipment not generally
obtained by using replacement components rated for found in the service trade.
higher voltage, wattage, etc. Replacement parts which b) Leakage Current Check
have these special safety characteristics are identified in Plug the AC line cord directly into the AC outlet (do not use
the parts list of Service manual. Electrical components a line isolation transformer during this check.). Using a
having such features are identified by shading on the "Leakage Current Tester", measure the leakage current
schematics and by ( ) on the parts list in Service from each exposed metal part of the cabinet, particularly
manual. The use of a substitute replacement which does any exposed metal part having a return path to the chassis,
not have the same safety characteristics as the to a known good earth ground (water pipe, etc.). Any
recommended replacement part shown in the parts list of leakage current must not exceed 0.5mA AC (r.m.s.).
Service manual may cause shock, fire, or other hazards. However, in tropical area, this must not exceed 0.2mA AC
(4) Don't short between the LIVE side ground and (r.m.s.).
ISOLATED (NEUTRAL) side ground or EARTH side Alternate Check Method
ground when repairing. Plug the AC line cord directly into the AC outlet (do not
Some model's power circuit is partly different in the GND. use a line isolation transformer during this check.). Use
The difference of the GND is shown by the LIVE : ( ) side an AC voltmeter having 1000 per volt or more
GND, the ISOLATED (NEUTRAL) : ( ) side GND and sensitivity in the following manner. Connect a 1500
EARTH : ( ) side GND. 10W resistor paralleled by a 0.15µF AC-type capacitor
Don't short between the LIVE side GND and ISOLATED between an exposed metal part and a known good earth
(NEUTRAL) side GND or EARTH side GND and never ground (water pipe, etc.). Measure the AC voltage
measure the LIVE side GND and ISOLATED (NEUTRAL) across the resistor with the AC voltmeter. Move the
side GND or EARTH side GND at the same time with a resistor connection to each exposed metal part,
measuring apparatus (oscilloscope etc.). If above note will particularly any exposed metal part having a return path
not be kept, a fuse or any parts will be broken. to the chassis, and measure the AC voltage across the
(5) When service is required, observe the original lead dress. resistor. Now, reverse the plug in the AC outlet and
Extra precaution should be given to assure correct lead repeat each measurement. Any voltage measured must
dress in the high voltage circuit area. Where a short circuit not exceed 0.75V AC (r.m.s.). This corresponds to
has occurred, those components that indicate evidence of 0.5mA AC (r.m.s.).
overheating should be replaced. Always use the However, in tropical area, this must not exceed 0.3V AC
manufacturer's replacement components. (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
PLACE THIS PROBE
ON EACH EXPOSED
1500 10W METAL PART
GOOD EARTH GROUND
(No.YA514)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.YA514)
1.3 INSTALLATION
1.3.1 HEAT DISSIPATION 1.3.3 INSTALLATION REQUIREMENTS
If the heat dissipation vent behind this unit is blocked, cooling To ensure safety in an emergency such as an earthquake, and
efficiency may deteriorate and temperature inside the unit will to prevent accidents, ensure that measures are taken to prevent
rise. The temperature sensor that protects the unit will be the TV dropping or falling over.
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
It fixes in a band.
TV STAND
*Diagram differs from actual appearance.
1.3.4 NOTES ON HANDLING
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.
*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.
200 mm 200 mm
150 mm 150 mm
50 mm
POWER
*Diagram differs from actual appearance.
(No.YA514)1-5
1.4 HANDLING LCD PANEL
1.4.1 PRECAUTIONS FOR TRANSPORTATION 1.4.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)
When transporting the unit, pressure exerted on the internal LCD (1) Avoid placing the unit under direct sunlight over a
panel due to improper handling (such as tossing and dropping) prolonged period of time. This may cause the optical filter
may cause damages even when the unit is carefully packed. To to deteriorate in quality and COLOUR.
prevent accidents from occurring during transportation, pay (2) Clean the filter surface by wiping it softly and lightly with a
careful attention before delivery, such as through explaining the soft and lightly fuzz cloth (such as outing flannel).
handling instructions to transporters. (3) Do not use solvents such as benzene or thinner to wipe the
Ensure that the following requirements are met during filter surface. This may cause the filter to deteriorate in
transportation, as the LCD panel of this unit is made of glass and quality or the coating on the surface to come off. When
therefore fragile: cleaning the filter, usually use the neutral detergent diluted
(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL with water. When cleaning the dirty filter, use water-diluted
When transporting the LCD panel of the unit, use a special ethanol.
packing case (packing materials). A special packing case (4) Since the filter surface is fragile, do not scratch or hit it with
is used when a LCD panel is supplied as a service spare hard materials. Be careful enough not to touch the front
part. surface, especially when taking the unit out of the packing
(2) ATTACH PROTECTION SHEET TO THE FRONT case or during transportation.
Since the front (display part) of the panel is vulnerable,
attach the protection sheet to the front of the LCD panel 1.4.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR
before transportation. Protection sheet is used when a LCD PARTS
panel is supplied as a service spare part. Take note of the following when replacing exterior parts (REAR
(3) AVOID VIBRATIONS AND IMPACTS COVER, FRONT PANEL, etc.):
The unit may be broken if it is toppled sideways even when (1) Do not exert pressure on the front of the LCD panel (filter
properly packed. Continuous vibration may shift the gap of surface). It may cause irregular COLOUR.
the panel, and the unit may not be able to display images (2) Pay careful attention not to scratch or stain the front of the
properly. Ensure that the unit is carried by at least 2 LCD panel (filter surface) with hands.
persons and pay careful attention not to exert any vibration (3) When replacing exterior parts, the front (LCD panel) should
or impact on it. be placed facing downward. Place a mat, etc. underneath
(4) DO NOT PLACE EQUIPMENT HORIZONTALLY to avoid causing scratches to the front (filter surface).
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.
1-6 (No.YA514)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 SYSTEM SETTEING 2.2 FEATURES
DIGITAL TUNER [DA8 series only]
Be sure to perform the following operation at the end of the
This TV can receive both DVB-T (Digital terrestrial broadcasting)
procedure.
and Analogue terrestrial broadcasting.
(1) Press the [INFORMATION] key and [MUTING] key HDMI INPUT
simultaneously, then enter the SERVICE MODE(Fig.2-1). By connecting a HDMI compatible device, high definition
(2) When the Main Menu is displayed, press [9]. pictures can be displayed on your TV in their digital form.
(3) The screen shown in Fig.2-2 is displayed, and the
SYSTEM SETTING starts. MOVIE THEATRE
This function displays a cinema film picture more smoothly and
NOTE: naturally on the screen.
When the SYSTEM SETTING is performed, all settings are
reset to the factory setting. Perform the setting again. DIGITAL VNR
This function cuts down the amount of noise in the original
picture.
SERVICE MENU SCREEN
3D Cinema Sound
You can enjoy sounds with a wider ambience.
SERVICE MENU
1.ADJUST
2.SELF_CHECK
3.I2C STOP
Fig. 2-1
Press [9] key
SHIPPING SCREEN
PR List Empty
*** SHIPPING STRAT ***
Fig. 2-2
2.3 MAIN DIFFERENCE LIST
Item LT-37A80SU LT-37A80ZU LT-37DA8SU LT-37DA8ZU LT-37DA8BJ
Paint Color Silver Black Silver Black Silver × Black
Digital Tuner NO YES
Teletext (Analog) TOP/FLOF FLOF
Teletext (Digital) NO EBU TEXT MHEG 5 UK profile
Broadcasting System B/G, D/K, I, L I
RF System PAL/SECAM PAL
Stereo System A2/NICAM NICAM
Power Cord Plug Type EU Type (2 Pins) UK Type (3 Pins)
Indoor ANT Power Supply NO YES
Digital Audio Optical Output NO YES
Remote Control Unit RM-C1508-1C RM-C1821-1C
(No.YA514)1-7
2.4 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2
Pin No. Signal designation Matching value EXT-1 EXT-2
1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
4 AUDIO GND Used Used
5 GND (B) Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)
7 B input 700mV(B-W), 75 Used Used
8 FUNCTION SW Low : 0V-3V Used Used
(SLOW SW) High : 8V-12V, High impedance
9 GND (G) Used Used
10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)
11 G input 700mV(B-W), 75 Used Used
12 SDA Not used Used (SDA2)
13 GND (R) Used Used
14 GND (YS) Used Not used
15 R / C input R : 700mV(B-W), 75 Used (R) Used (C2/R)
C : 300mV(P-P), 75
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75 Used Used
17 GND (VIDEO output) Used Used
18 GND (VIDEO input) Used Used
19 VIDEO output 1V(P-P) (Negative sync), 75 Used (TV OUT) Used (LINE OUT)
20 VIDEO / Y input 1V(P-P) (Negative sync), 75 Used Used
21 COMMON GND Used Used
(P-P= Peak to Peak, B-W= Blanking to white peak)
[Pin assignment]
20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
1-8 (No.YA514)
2.5 TECHNICAL INFORMATION
2.5.1 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.
2.5.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
Item Specifications
Maximum dimensions ( W × H × D ) 87.7 cm × 51.7 cm × 5.6 cm
Weight 9.5 kg
Effective screen size Diagonal: 92.0 cm (H: 82.2 cm × V: 46.3 cm)
Aspect ratio 16 : 9
Drive device / system a-Si-TFT active matrix system
Resolution Horizontally 1366 × Vertically 768 × RGB 3147264 dots in total
Pixel pitch (pixel size) Horizontally: 0.200 mm, Vertically: 0.600 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 500 cd/m2
Contrast ratio 1000 : 1
Response time (Tr) less than 6 ms
View angle (Horizontally) 178°
View angle (Vertically) 178°
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight Cold cathode fluorescent lamp × 20
Power supply voltage in LCD 12 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)
2.5.1.2 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.
(No.YA514)1-9
2.5.2 MAIN CPU PIN FUNCTION [IC7001 : MAIN PWB]
Pin Pin name I/O Function Pin Pin name I/O Function
1 T-V LINK_OUT O Data output for T-V LINK 77 VSUP3.3COM I 3.3V power supply
2 POWER_G I Not used : Low power voltage detection [NG = H] 78 X'TALIN I 20.25MHz oscillation for CPU system clock
3 PROTECTOR I Power abnormality detection [Emergent = H] 79 X'TALOUT O 20.25MHz oscillation for CPU system clock
4 TCLK I Clock for JTAG interface 80 CLKOUT O Not used
5 TDO O Data output for JTAG interface 81 VSO O Not used
6 TDI I Data input for JTAG interface 82 HSO O Not used
7 TMS I Control signal for JTAG interface 83 SCL1 O Clock for I2C bus (for HDMI)
8 RESETQ I CPU reset [Reset = L] 84 SDA1 I/O Data for I2C bus (for HDMI)
9 E3_R I Audio input for EXT-3 85 GND3.3FL - GND
10 E3_L I Audio input for EXT-3 86 VSUP3.3FL I 3.3V power supply
11 DIN/D_R I Audio input for digital tuner/HDMI 87 AFC1 I AFT voltage for VHF/UHF tuner
12 DIN/D_L I Audio input for digital tuner/HDMI 88 DIN_PHOTO I For digital input protection
13 E1_R I Audio input for EXT-1 89 A_MU O Speaker/headphone output muting [Muting = H]
14 E1_L I Audio input for EXT-1 90 PFC_POW O Not used : Power on/off control for PFC [ON = L]
15 E2_R I Audio input for EXT-2 91 DIN_INT I Interrupt request for HDMI
16 E2_L I Audio input for EXT-2 92 LCD_POW O Power on/off control for LCD drive [ON = L]
17 VREFAU I Reference voltage setting 93 OSDV I Not used
18 VSUP8.0AU I 8V power supply 94 OSDH I Not used
19 GNDA - GND 95 GND3.3IO1 - GND
20 SGND - GND 96 VSUP3.3IO1 I 3.3V power supply
21 R2_OUT O Audio output for EXT-2 97 OSDCLK I Not used
22 L2_OUT O Audio output for EXT-2 98 OSDFSW I Not used
23 R_OUT O Audio output for EXT-1 99 MAIN_POW O Power on/off control for main power [ON = L]
24 L_OUT O Audio output for EXT-1 100 IDTV_IRQ O Interrupt request for digital tuner
25 HEADPHONE_R O Audio output for headphone 101 RXD I Data communication for digital tuner
26 HEADPHONE_L O Audio output for headphone 102 TXD O Data communication for digital tuner
27 SPEAKER_R O Audio output for speaker 103 OSDB1 O Not used
28 SPEAKER_L O Audio output for speaker 104 OSDB0 O Not used
29 SUBWOOFER O Not used 105 LB_POW O Power on/off control for low bias line [ON = L]
30 VREFSIF I Reference voltage setting 106 REMOCON I Remote control sensor input
31 SIF_IN+ I SIF for VHF/UHF tuner 107 OSDG1 O Not used
32 SIF_IN- I SIF for VHF/UHF tuner 108 OSDG0 O Not used
33 VSUP5.0 I 5V power supply 109 SDA0 I/O Data for I2C bus (for E2PROM)
34 GNDA - GND 110 SCL0 O Clock for I2C bus (for E2PROM)
35 GND3.3DIG - GND 111 OSDR1 O Not used
36 VSUP3.3DIG I 3.3V power supply 112 OSDR0 O Not used
37 SPDIF_OUT O Not used 113 GND3.3IO1 - GND
38 I2S_DA_IN I Not used 114 VSUP3.3IO1 I 3.3V power supply
39 I2S_CL - Not used 115 DIN_HOTP O Hotplug error detection for HDMI connector-1 [Error = L]
40 I2S_WS - Not used 116 DIN_RST O Reset for HDMI [Reset = L]
41 I2S_DEL_OUT O Not used 117 MB_RES O Not used : Reset for MaxxBass [Reset = L]
42 I2S_DEL_IN I Not used 118 PCS3 O Not used
43 I2S_DEL_CL - Not used 119 POW_LED O POWER LED(green) lighting [ON = L]
44 I2S_DEL_WS - Not used 120 DINHOTP2 O Hotplug error detection for HDMI connector-2 [Error = L]
45 VSUP3.3RAM I 3.3V power supply 121 PCLK2 O Not used
46 GND3.3RAM - GND 122 PCLK1 O Not used
47 VD_DV1 I V sync for HDMI 123 GND1.8DIG - GND
48 DE_DV1 I Data enable for HDMI 124 VSUP1.8DIG I 1.8V power supply
49 CLK_DV1 I Clock for HDMI 125 DBO1_0 O Not used
50 DV1_R7 I Pr input for HDMI 126 DBO1_1 O Not used
51 DV1_R6 I Pr input for HDMI 127 VSUP3.3LVDS I 3.3V power supply
52 DV1_R5 I Pr input for HDMI 128 LVDS_A3+ O LVDS data output for LCD panel
53 DV1_R4 I Pr input for HDMI 129 LVDS_A3- O LVDS data output for LCD panel
54 DV1_R3 I Pr input for HDMI 130 GND3.3LVDS - GND
55 DV1_R2 I Pr input for HDMI 131 LVDS_ACLK+ O LVDS clock output for LCD panel
56 DV1_R1 I Pr input for HDMI 132 LVDS_ACLK- O LVDS clock output for LCD panel
57 DV1_R0 I Pr input for HDMI 133 VSUP3.3LVDS I 3.3V power supply
58 DV1_Y7 I Y input for HDMI 134 LVDS_A2+ O LVDS data output for LCD panel
59 DV1_Y6 I Y input for HDMI 135 LVDS_A2- O LVDS data output for LCD panel
60 DV1_Y5 I Y input for HDMI 136 GND3.3LVDS - GND
61 DV1_Y4 I Y input for HDMI 137 LVDS_A1+ O LVDS data output for LCD panel
62 DV1_Y3 I Y input for HDMI 138 LVDS_A1- O LVDS data output for LCD panel
63 DV1_Y2 I Y input for HDMI 139 VSUP3.3LVDS I 3.3V power supply
64 DV1_Y1 I Y input for HDMI 140 LVDS_A0+ O LVDS data output for LCD panel
65 DV1_Y0 I Y input for HDMI 141 LVDS_A0- O LVDS data output for LCD panel
66 DV1_B7 I Pb input for HDMI 142 VSUP1.8LVDS I 1.8V power supply
67 DV1_B6 I Pb input for HDMI 143 REXT O Not used
68 DV1_B5 I Pb input for HDMI 144 GND1.8LVDS - GND
69 DV1_B4 I Pb input for HDMI 145 DGO1_8 O Not used
70 DV1_B3 I Pb input for HDMI 146 DGO1_9 O Not used
71 DV1_B2 I Pb input for HDMI 147 GND3.3LVDS - GND
72 DV1_B1 I Pb input for HDMI 148 DRO1_1 O Not used
73 DV1_B0 I Pb input for HDMI 149 LVDS_BCLK- O Not used
74 GND3.3DRI - GND 150 VSUP3.3LVDS I 3.3V power supply
75 VSUP3.3DRI I 3.3V power supply 151 DRO1_2 O Not used
76 GND3.3COM - GND 152 DRO1_3 O Not used
153 GND3.3LVDS - GND
1-10 (No.YA514)
Pin Pin name I/O Function
154 DRO1_5 O Not used
155 DRO1_6 O Not used
156 VSUP3.3LVDS I 3.3V power supply
157 DRO1_8 O Not used
158 DRO1_9 O Not used
159 AGC I RF AGC voltage for VHF/UHF tuner
160 KEY1 I Key scan for side control (POWER/CH+/CH-/MENU)
161 SLOW1 I EXT-1 SLOW detection
162 SLOW2 I EXT-2 SLOW detection
163 GND3.3DAC - GND
164 VSUP3.3DAC I 3.3V power supply
165 DC_DIM O DC dimming control for back-light inverter
166 PWM_DIM O PWM dimming control for back-light inverter
167 DTV_SW O Audio output select for EXT-2 [Digital tuner = H]
168 SUB_MUTE O Audio output muting [Muting = L]
169 VSUP1.8FE I 1.8V power supply
170 VSUP3.3FE I 3.3V power supply
171 HD_DV1 I H sync for HDMI
172 SC_B1 I B input for EXT-1
173 SC_G1 I G input for EXT-1
174 SC_R1 I R input for EXT-1
175 SC_YS2 I Ys input for EXT-2
176 E3_PB I Pb input for EXT-3
177 E3_Y I Y input for EXT-3
178 E3_PR I Pr input for EXT-3
179 SC_B2 I B input for EXT-2
180 SC_G2 I G input for EXT-2
181 SC_R2/C I R/C input for EXT-2
182 D_BY I Pb input for digital tuner
183 SC_YS1 I Ys input for EXT-1
184 D_Y I Y input for digital tuner
185 VSUP1.8FE I 1.8V power supply
186 GNDA - GND
187 D_RY I Pr input for digital tuner
188 D_CV I Video input for digital tuner
189 E1_CV I Video input for EXT-1
190 E2_CV/Y I Video/Y input for EXT-2
191 TV_CV I Video input for VHF/UHF tuner
192 VSUP3.3VO I 3.3V power supply
193 VOUT3 O Not used
194 VOUT2 O Not used
195 V2_OUT O Video output for EXT-2
196 GND3.3IO3 - GND
197 VSUP3.3IO3 I 3.3V power supply
198 656I0 I Not used
199 656I1 I Not used
200 656I2 I Not used
201 656I3 I Not used
202 656I4 I Not used
203 656I5 I Not used
204 656I6 I Not used
205 656I7 I Not used
206 656CLKI I Not used
207 656CLKO O Not used
208 TV_LINK_IN I Data input from T-V LINK
(No.YA514)1-11
SECTION 3
DISASSEMBLY
3.1 DISASSEMBLY PROCEDURE
· Be sure to perform the SYSTEM SETTEING, at the end of the procedure.
· Make sure that the power cord is disconnected from the outlet.
· Pay special attention not to break or damage the parts.
· Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.
REFERENCE:
When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points
(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit
Diagram.
3.1.1 REMOVING THE REAR COVER (Fig.3-1) 3.1.7 REMOVING THE LED PWB (Fig.3-1)
(1) Remove the 10 screws [A], the 8 screws [B] and the 5 · Remove the REAR COVER.
screws [C]. · Remove the STAND ASS'Y.
(2) Remove the REAR COVER. (1) Remove the 2 screw [Q].
(2) Remove the STAND BASE COVER.
3.1.2 REMOVING THE STAND ASS'Y (Fig.3-1) (3) Remove the 1 screw [R] and 2 screws [S].
(1) Remove the 4 screws [D]. (4) Remove the STAND BASE.
(2) Remove the STAND ASS'Y in the direction of the arrow. (5) Remove the 2 screws [T] and 2 hooks [a].
(6) Remove the LED PWB.
3.1.3 REMOVING THE POWER PWB (Fig.3-1)
· Remove the REAR COVER. 3.1.8 REMOVING THE SPEAKER (Fig.3-1)
(1) Remove the 1 screw [E]. · Remove the REAR COVER.
(2) Remove the POWER CORD HOLDER. · Remove the STAND ASS'Y.
(3) Remove the POWER CORD. · Remove the STAND BASE COVER.
(4) Remove the 5 screws [F]. · Remove the STAND BASE.
(5) Remove the POWER PWB. (1) Remove the 3 screws [U].
(2) Remove the SPEKAER.
3.1.4 REMOVING THE MAIN PWB (Fig.3-1) (3) Follow the same steps when removing the other hand
· Remove the REAR COVER. SPEAKER.
(1) Remove the 1 screw [G] [DA8 series only]. NOTE
(2) Remove the DIGITAL BASE [DA8 series only]. When the SPEAKER is decomposed, the performance cannot
(3) Remove the 2 screws [H] [DA8 series only]. be kept.
(4) Remove the 7 screws [J], the 2 screws [K], 1 screw [L] and 1
nut. 3.1.9 REMOVING THE LCD PANEL UNIT (Fig.3-1)
(5) Remove the SHIELD COVER. · Remove the REAR COVER.
(6) Remove the 6 screws [M]. · Remove the STAND ASS'Y.
(7) Remove the MAIN PWB. · Remove the STAND BASE COVER.
CAUTION : · Remove the STAND BASE.
Make sure to perform the "SYSTEM SETTEING", when MAIN · Remove the POWER CORD HOLDER.
PWB is replaced. · Remove the SPEKAER.
(1) Remove the 7 screws [V].
3.1.5 REMOVING THE DIGITAL TUNER UNIT [DA8 series (2) Remove the 4 screws [W].
only] (Fig.3-1) (3) Remove the MAIN BASE.
· Remove the REAR COVER. (4) Remove the LCD PANEL UNIT from the FRONT PANEL.
· Remove the DIGITAL BASE.
· Remove the SHIELD COVER.
(1) Remove the 5 screws [N].
(2) Remove the DIGITAL TUNER UNIT.
3.1.6 REMOVING THE SW PWB (Fig.3-1)
· Remove the REAR COVER.
(1) Remove the 2 screws [O].
(2) Remove the SW PWB.
(3) Remove the 2 screws [P].
(4) Remove the CONTROL KNOB.
1-12 (No.YA514)
B D
A
C Q
DIGITAL G STAND BASE COVER
BASE
H
J
REAR COVER
K L
M
MAIN PWB SHIELD
COVER
NUT
F
POWER PWB
N
DIGITAL
W TUNER UNIT
[DA8 series]
STAND ASS'Y
S
V
W R
W
V
E
STAND BASE
POWER CORD
MAIN BASE
POWER CORD
HOLDER W T U
LED PWB
U
LCD PANEL UNIT
SPACER
SPACER
FRONT PANEL SPEAKER
SPACER U
CONTROL O
SW PWB a
U
P
P
SPEAKER
SPACER The illustration is LT-37DA8 series
CONTROL KNOB
Fig.3-1
(No.YA514)1-13
3.2 MEMORY IC REPLACEMENT
· This model uses the memory IC.
· This memory IC stores data for proper operation of the video and drive circuits.
· When replacing, be sure to use an IC containing this (initial value) data.
3.2.1 MEMORY IC TABLE
Simbol Number of pins Mounting PWB Main content of data
IC7003 8-pin MAIN PWB Setting value of IC7001(MAIN CPU) is memorized.
3.2.2 MEMORY IC REPLACEMENT PROCEDURE
1. Power off
Switch off the power and disconnect the power plug from the AC outlet.
2. Replace the memory IC
Be sure to use the memory IC written with the initial setting values.
3. Power on
Connect the power plug to the AC outlet and switch on the power.
4. Receiving channel setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
5. User setting
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING
INSTRUCTIONS and set the items as described.
6. SERVICE MODE setting
Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.3-2). Refer to the SERVICE ADJUSTMENT for set-
ting.
3.2.3 SERVICE MODE SETTING
SERVICE MODE SCREEN SETTING ITEM
Setting mode Setting items Settings
SERVICE MODE SCREEN
1.ADJUST 1.SC ADJ. Adjust
2.R DRIVE Adjust
SERVICE MENU
3.G DRIVE Adjust
1.ADJUST
2.SELF_CHECK 4.B DRIVE Adjust
3.I2C STOP
5.CUTOFF R Fixed [Do not adjust]
6.CUTOFF G Fixed [Do not adjust]
7.CUTOFF B Fixed [Do not adjust]
Press [1] key
1. ADJUST 8.COLOUR Fixed [Do not adjust]
ADJUST AUTO FUL 9.HUE Fixed [Do not adjust]
1.SC ADJ 14
10.CONTRAST Fixed [Do not adjust]
11.BRIGHT Fixed [Do not adjust]
12.SHARP Fixed [Do not adjust]
SC DEV:+ 0 13.DC EXTMD Fixed [Do not adjust]
- + OK:STORE i=EXIT
14.PWM EXTMD Fixed [Do not adjust]
Fig.3-2
1-14 (No.YA514)
3.2.4 SETTINGS OF FACTORY SHIPMENT
3.2.4.1 BUTTON OPERATION 3.2.4.2 REMOTE CONTROL DIRECT OPERATION
Setting item Setting position Setting item Setting position
POWER Off CHANNEL PR1
CHANNEL PR1 VOLUME 10
VOLUME 10 ZOOM AUTO
TV/AV TV SUB POWER OFF
3.2.4.3 REMOTE CONTROL MENU OPERATION
(1) PICTURE (6) DTV [DA8 series only]
Setting item Setting position [For UK]
PICTURE MODE BRIGHT Setting item Setting position
COLOUR TEMP. COOL Configuration
FEATURES Audio Language English
DIGITAL VNR ON Subtitle Language English
Digi Pure ON Favourite Mode Off
MOVIE THEATRE OFF Menu Lock Disable
COLOUR SYSTEM TV Depends on PR/CH [For Finland/Germany/Spain/Sweden]
EXT AUTO Setting item Setting position
4:3 AUTO ASPECT PANORAMIC Configuration
(2) SOUND Country --- *
Setting item Setting position Menu Language --- *
STEREO / I·II Stereo sound Audio Language --- *
BASS Centre Subtitle Language --- *
TREBLE Centre Teletext Language --- *
BALANCE Centre EPG Language --- *
HYPER SOUND OFF Enter PIN Code 0000
3D CINEMA SOUND Favourite Mode Off
SORRUND MID Maturity Rating Off
BASS BOOST MID *It differs according to the language that the user selected.
(4) FEATURES [For All country]
Setting item Setting position Setting item Setting position
SLEEP TIMER OFF Setup
CHILD LOCK ID NO.0000, All CH off Digital Audio Output PCM
BLUE BACK ON Banner Duration 2sec
FAVOURITE SETTING Blank Receiver Upgrade Auto
APPEARANCE TYPE A Common Interface ---
Antenna Power Off
(5) SET UP
Setting item Setting position
AUTO PROGRAM TV channel automatically set
EDIT/MANUAL PRESET CH only
LANGUAGE ENGLISH
DECODER (EXT-2) OFF
EXT SETTING EXT-1
ATTENUATOR OFF [DA8/DT8 series only]
HDMI SETTING
HDMI-1 Size AUTO
Audio AUTO
HDMI-2 Size AUTO
(No.YA514)1-15
3.3 REPLACEMENT OF CHIP COMPONENT
3.3.1 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.
3.3.2 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.
3.3.3 REPLACEMENT STEPS
1. How to remove Chip parts 2. How to install Chip parts
[Resistors, capacitors, etc.] [Resistors, capacitors, etc.]
(1) As shown in the figure, push the part with tweezers and (1) Apply solder to the pattern as indicated in the figure.
alternately melt the solder at each end.
(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.
(2) Shift with the tweezers and remove the chip part.
[Transistors, diodes, variable resistors, etc.]
[Transistors, diodes, variable resistors, etc.]
(1) Apply solder to the pattern as indicated in the figure.
(1) Apply extra solder to each lead. (2) Grasp the chip part with tweezers and place it on the
solder.
(3) First solder lead A as indicated in the figure.
SOLDER SOLDER
A
(2) As shown in the figure, push the part with tweezers and
alternately melt the solder at each lead. Shift and remove B
the chip part.
C
(4) Then solder leads B and C.
A
B
NOTE :
After removing the part, remove remaining solder from the C
pattern.
1-16 (No.YA514)
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) This TV is adjusted by using REMOTE CONTROL UNIT.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values
which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC power source.
(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service
adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENTS 4.5.3 CHANGE AND MEMORY OF SETTING VALUE
Unless