TCL LCD20V6AT Schematic

SERVICE MANUAL

LCD20V6AT

1. Caution………………………………………….2

2. Specification…………………………………….6

3. BOM List………………………………………..8

4. Alignment Procedure………………………….14

5. Circuit Block Diagram…….…………………..15

6. Schematic Diagram……………………………18

7. Explode View Diagram………………………..27

This manual is the latest at the time of printing, and does not
include the modification which may be made after the printing, by
the constant improvement of product.

RISK

ELECTRI

SHOCK

NOT

OPEN.

SCHNEIDER ELECTRONICS GMBH-GERMANY

2

1. CAUTION

CAUTION:

Use of controls, adjustments or procedures other than those specified herein may result in
hazardous radiation exposure.

CA UTION: TO RE DU CE THE RIS K OF

CA U T IO N

RISK

OF ELECTR I

SHOCK

The lighting flash with arrowhead symbol, with an equilateral triangle is intended to
alert the user to the presence of uninsulated voltage within the products
enclosure that may be of sufficient magnitude to constitute a risk of electric shock to
the person.

The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the
literature accompanying the appliance.

DO NOT

C

OPEN.

ELECTR ICAL SHOCK , DO NOT RE MOVE
COVER (OR BACK). NO USER SERVICEABLE
PAR TS INS IDE . RE FE R SE R VIC ING TO
QUALIFIE D SERVIC E PERSONNEL.

dangerous

WARNING: TO REDUCE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

2

SCHNEIDER ELECTRONICS GMBH-GERMANY

3

IMPORTANT SAFETY INSTRUCTIONS

CAUTION:

Read all of these instructions. Sa ve these instructions for later use . Follo w all W arnings and
Instructions marked on the audio equipment.

1. Read Instructions-All the safety and operatinginstructionsshouldbe read before the productis operated.

2. Retain Instructions- The safety and operating instructions should be retained for future reference.

3. Heed Warnings- All warnings on the product and in the operating instructions should be adhered to.

4. Follow Instructions- All operating and use instructions should be followed.

FOR YOUR PERSONAL SAFETY

1. When the power cord or plug is damaged or frayed, unplug this television set from the wall outlet and refer servicing to
qualified service personnel.

2. Do not overload wall outlets and extension cords as this can result in fire or electric shock.

3. Do not allow anything to rest on or roll over the power cord, and do not place the TV where power cord is subject to
traffic or abuse. This may result in a shock or fire hazard.

4. Do not attempt to service this television set yourself as opening or removing covers may expose you to dangerous
voltage or other hazards. Refer all servicing to qualified service personnel.

5. Never push objects of any kind into this television set through cabinet slots as they may touch dangerous voltage
points or short out parts that could result in a fire or electric shock. Never spill liquid of any kind on the television set.

6. If the television set has been dropped or the cabinet has been damaged, unplug this television set from the wall outlet
and refer servicing to qualified service personnel.

7. If liquid has been spilled into the television set, unplug this television set from the wall outlet and refer servicing to
qualified service personnel.

8. Do not subject your television set to impact of any kind. Be particularly careful not to damage the picture tube surface.

9. Unplug this television set from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a
damp cloth for cleaning.

10.1. Do not place this television set on an unstable cart, stand, or table. The television set may fall, causing serious injury
to a child or an adult, and serious damage to the appliance. Use only with a cart or stand recommended by the
manufacturer, or sold with the television set. Wall or shelf mounting should follow the manufacturer s instructions, and
should use a mounting kit approved by the manufacturer.

10.2. An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to overturn.

3

SCHNEIDER ELECTRONICS GMBH-GERMANY

4

PROTECTION AND LOCATION OF YOUR SET

11. Do not use this television set near water ... for example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a
wet basement, or near a swimming pool, etc.
Never expose the set to rain or water. If the set has been exposed to rain or water, unplug the set from the wall
outlet and refer servicing to qualified service personnel.

12. Choose a place where light (artificial or sunlight) does not shine directly on the screen.

13. Avoid dusty places, since piling up of dust inside TV chassis may cause failure of the set when high humidity persists.

14. The set has slots, or openings in the cabinet for ventilation purposes, to provide reliable operation of the receiver, to

protect it from overheating. These openings must not be blocked or covered.

Never cover the slots or openings with cloth or other material.
Never block the bottom ventilation slots of the set by placing it on a bed, sofa, rug, etc.
Never place the set near or over a radiator or heat register.
Never place the set in enclosure, unless proper ventilation is provided.

a built-in

PROTECTION AND LOCATION OF YOUR SET

15.1. If an outside antenna is connected to the television set, be sure the antenna system is grounded so as to provide some

protection against voltage surges and built up static charges, Section 810 of the National Electrical Code, NFPA No.
70-1975, provides information with respect to proper grounding of the mast and supportingstructure, grounding of the
lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna discharge unit, c onnection
to grounding electrode, and requirements for the grounding electrode.

EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS

EXAMPLE OF ANTENNA GROUNDING AS PER

NATIONAL ELECTRICALCODE

ANTENNA
LEAD- IN WIRE

GROUND CLAMP

ELECTRIC SERVICE

EQUIPMENT

NEC-NATIONAL ELECTRICALCODE

ANTENNA DISCHARGE
UNIT (NEC SECTION
810-20)

GROUNDING
CONDUCTORS
(NECSECTION 810-21)

GROUND CLAMPS

POWER SER VICE GROUNDING
ELECTRODE SYSTEM
(NEC ART 250. PART H)

15.2. Note to CATV system installer : (Only for the television set with CATV reception)

This reminder is provided to call the CATV system attention to Article 820-40 of the NEC that provides

installer s
guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding
system of the building, as close to the point of cable entry as practical.

16. An outside antenna system should not be located in the vicinity of overhead power lines or other electric lights or power
circuits, or where it can fall into such power lines or circuits. When installing an outside antenna system, extreme care
should be taken to keep from touching such power lines or circuits as contact with them might be fatal.

17. For added protection for this television set during a lightning storm, or when it is left unattended and unused for long
periods of time, unplug it from the wall outlet and disconnect the antenna. This will prevent damage due to lightning
and power-line surges.

4

SCHNEIDER ELECTRONICS GMBH-GERMANY

5

OPERATION OF YOUR SET

18.

This television set should be operated only from the type of power source indicated on the marking label.If you are not
sure of the type of power supply at your home, consult your television dealer or local power company. For television
sets designed to operate from battery power, refer to the operating instructions.

19. If the television set does not operate normally by following the operating instructions, unplugthis television set from the
wall outlet and refer servicing to qualifiedservice personnel. Adjust only those controls that are covered in the operating
instructions as improper adjustment of other controls may result in damage and will often require extensive work by a
qualified technician to restore the television set to normal operation.

20. When going on a holiday : If your television set is to remain unused for a period of time, for instance, when you go on
a holiday, turn the television set and unplug the television set from the wall outlet.

off

IF THE SET DOES NOT OPERATE PROPERLY

21. If youare unable to restore normaloperationby followingthedetailedprocedurein your operating instructions,
do not attempt any further adjustment. Unplug the set and call your dealer or service technician.

22. Whenever the television set is damaged or fails, or a distinct change in performance indicates a need for
service, unplug the set and have it checked by a professional service technician.

23. It is normal for some TV sets to make occasional snapping or popping sounds, particularly when being
turned on or off. If the snapping or popping is continuous or frequent, unplug the set and consult your
dealer or service technician.

FOR SERVICE AND MODIFICATION

24. Do not use attachments not recommendedby the television set manufacturer as they may cause hazards.

25. When replacementparts are required,be sure the service technician has used replacementparts specified
by the manufacturer that have the same characteristics as the original part. Unauthorized substitutions
may result in fire, electric shock, or other hazards.

26. Upon completion of any service or repairs to the television set, ask the ser vice technician to perform
routine safety checks to determine that the television is in safe operating condition.

5

2. SPECIFICATION

6

Environment

Screen Parameter

Color System

TV：■PAL – DK ■PAL – I ■NTSC-M ■PAL – BG □PAL – N □PAL – M □SECAM □SECAM-L □Other：
AV：■NTSC4.43 ■NTSC3.58 ■PAL ■SECAM □Other：
Nicam

■NICAM □MTS □FM-FM □German Stereo □BTSC □SAP □Other：
Program

□Program Auto Mark □Program Compositor ■Auto Searching ■Manual Searching ■Tuning □Other：
Teletext Type： Pages：

□CCD □V-CHIP □Macro Vision □HDCP
Audio:

□Insert SPK. ■Insert Amplifier ■Sound Effect ■AVC □Output Power(W): 1.5W*2
□SRS □EQ: Steps：

■Sound Effect Adjustment： ■Bass ■Treble □Balance □Others：

Antenna Input: □BNC ■IEC □Other：

Operation Temperature( ):℃ 0～50
Operation Humidity(%): 20%~90%RH(0~40℃) Store Humidity(%): 20%~90%RH(-20~40℃)
Air Pressure(kps)
Screen Size(inch)：20.1

Effective Size(mm x mm)：

mm(H) X 306mm(V)

408

Angle of View (H/V)： □160/160 ■160/140 □Other:
Responsive Time (ms)：

■8 □12 □16 □25 □Other：
Contrast ( Darkness, Nakedness): 600
Background Light：6-CCFL Backlight unit
Colors：Supporting 16.7 M
Gray：256
Max. V. Frequency(Hz): 70Hz
Resolution: ■640×480 □852×480 □1024×768 □1280×720 □1280×768
□1280×1024 □1366×768 □1920×1080 □Other：
Max. Resolution（H×V）: □640×480 □800×600 ■1024×768 □1400×1050

□1600×1200 □1280×800 □1280×854 □1920×1200 □Other：

HDTV/SDTV(p): ■1920×1080i □1920×1080p □1920×1125i □1440×1080i

■1280×720P ■576P ■720×480p □Other：

:

Store Temperature( ):℃ -20~60

Panel size(mm x mm x mm):

448.6mm(H) X 339.6mm(V) X 23.6 (D)
Panel Type：TFT LCD

Image Size(mm x mm)：

0.2125(H) x 0.6375(V)
Luminance of Peak Value(cd/m²)：500
Ratio: □16:9 ■4:3 □Other：
Color Temperature(°K):
Cool: 11000, Standard: 9300, Warm:7000
Max. H. Frequency(KHz): 56.5kHz

Input

Video

Audio

■VGA Input (Type:D-15 Quantity: 1 )

■Component ( ■RCA □ BNC □SCART □Other： )

■Composite ( ■RCA □BNC □SCART □Other： )
□ DVI Input (Type： Quantity： )
□ HDMI Input (Type： Quantity： )
□RGB Input (□ SCART □ Other： )

■S-Video Input (Quantity: 1 )

■Audio Input（RCA） (Quantity : 1 )

■Earphone Input (Quantity : 1 )

7

Output

OSD:
Languages： □Chinese ■English ■Russian □Other:
Adjustment via OSD:

■Contrast ■Chroma ■H/V - size（YCbCr） □Picture Rotation ■Brightness ■Tint ■H/V - position（YCbCr） □Other：

Certification
□CCC □CE □UL □CUL □FCC □FDA ■CB □RoHS □Other
Power Supply:

Max. Power Consumption(W): 55W Voltage(V): 110-240V~
Standby Power Consumption(W):< 6W ■Switch on/off ■Auto stand-by (Timer：5 Min.) ■Other：Time On

Accessories:

■Remote Control ■Stand (Optional) □Scart Cord ( m) □Bracket(Optional) □Bracket Accessories(Optional)

■Power Supply Cord □Antenna (1.8 m) □Speakers (Optional) □VGA line (Type： ） ■Other：Adapter

Video

Audio

□Composite Video (□RCA □BNC □SCART □Other： )
□Audio Output (L/R) (□RCA)

□Audio Output 5.1
□Speaker (Insert Amplifier)
□Audio Digital Coaxial (RCA)
□Audio digital optical

■Earphone Output

Packing

Unit Size(w×h×d, mm): 609X500X79 NET(kg): 11
Packing Size(w×h×d, mm): 700X590X290 Gross Weight(kg): 15.5

3.Bom List

8

ITEM SPEC. QTY LOCATION

T6-0Q0036-H027X REMOTE HANDSET ASSEMBLY 1
11-0BC337-0BX TRANSISTOR (NPN) BC337-40 1 Q1
13-00AS12-13B IC AS1213B 1 U1
14-IRE05B-XX0 IR EMITTING DIODE TSAL6200 1 D2
18-CB0221-JNX RES. C.F. 220 OHM 1/6W +/-5% 1 R2
18-CB0229-JNX RES. C.F. 2.2 OHM 1/6W +/-5% 1 R1
25-HBB479-M1X CAP. ELEC 4.7 UF 10V +/-20% 1 C4
26-EBP101-JCS CAP. CER 100 PF 50V +/-5% 2 C2;C1
26-EBP103-ZFX CAP. CER 0.01UF 50V +80/-20% F 1 C3
40-LD40V8-RMC1X P.C.B.REMOTE HANDSET BD 1
41-WJ0050-B00 WIRE BARE JUMPER 5MM 1 J1
45-COS455-KY0 CERAMIC RESONATOR 455KHZ 1 Y1
67-X38064-0E2 BATTERY SPRING (+/-) 1
67-X38065-0E2 BATTERY SPRING (+) 1
67-X38066-0E2 BATTERY SPRING (-) 1
71-270870-0A9 LABEL 1
74-007026-60C POLYBAG (70MMX260MMX0.06MM) 1
T6-0Q0036-H027XZ REMOTE HANDSET ASSEMBLY 1
49-HS36Q0-00X1E RUBBER PAD KEYS 1
55-HS36QB-0HA1A QREMOTEHANDSET-BOTTOMCABINET 1
55-HS36QD-0HA1A QBATTDOOR-REMOTEHANDSET 1
55-HS36QT-0HA1H TOP CASE 1
56-399030-0HC5Z REMOTE HANDSET LENS 1
58-HS36Q0-FUI1A INLAY REMOTE HANDSET 1
T8-JV6TRT-BSY ASS'Y - BASE 1
59-100010-000 FOOT CUSHION 8
63-B30080-BT3 SCREW BT BID 3 X 8 STL BZN 10 MTG BASE COVER-SEEEL-PLATE

63-B30120-AB2 S/T SCREW B 3 X 12 AB 2 MTG BASE FRONT CAB & BASE REAR CAB
64-F40080-103 M/C SCREW F 4 X 8 9 MTG HINGE-ASSEM & SEEEL PLATE

67-M80437-0E0 SOLEPLATE 1
68-804360-000 HINGE-ASSEMBLY 1
T8-JV6TRT-BSYZ ARFBASE ASSEMBLY 1
55-803720-0HA1B BASE COVER 1
55-803740-0HA6L FRONT PANEL 1
55-803750-0HA6L REAR PANEL 1
T8-JV6TRT-FBY FRONT CONTROL BD ASSEMBLY 1
40-LD20V6-FBD1X P.C.B.FRONT CTL BD 1
46-35199W-03X PIN BASE *3 PITCH=2.0MM 1 J001
46-35199W-05X CONN.PH-5A 5PIN PITCH=2.0MM 1 J1001
46-39699H-03X 3P UL2547#24 610MM 1 FRONT CTL BD TO DIGITAL (J11)
46-39737H-05X UL20080#28 510MM 1 J1001 TO DIGITAL (J7)
48-POW001-XX0 SWITCH POWER KDC-A11 B2 1 SW001

48-TAC002-XX0 TACT SWITCH 6
57-LEDH05-000 LED BRACKET 1 FOR IR01

SW1006;SW1005;SW1004;SW1003;SW1002;
SW1001

ITEM SPEC. QTY LOCATION

9

02-IRR001-XX1 IR RECEIVER MODULE HRM380017 1 IR01
11-SC1815-YBX TRANSISTOR 2SC1815-Y (NPN) 1 Q1001
14-LED03R-XX1 LED RED Φ3MM FO203 1 LED1001
18-CB0100-JNX RES. C.F. 10 OHM 1/6W +/-5% 1 R1008
18-CB0103-JNX RES. C.F. 10K OHM 1/6W +/-5% 1 R1006
18-CB0122-JNX RES. C.F. 1.2K OHM 1/6W +/-5% 1 R1005
18-CB0182-JNX RES. C.F. 1.8K OHM 1/6W +/-5% 1 R1004
18-CB0272-JNX RES. C.F. 2.7K OHM 1/6W +/-5% 1 R1003
18-CB0332-JNX RES. C.F. 3.3K OHM 1/6W +/-5% 1 R1002
18-CB0102-JNX RES. C.F. 1K OHM 1/6W +/-5% 1 R1007
18-CB0562-JNX RES. C.F. 5.6K OHM 1/6W +/-5% 1 R1001
25-HCB100-M1X CAP. ELEC 10 UF 16V +/-20% 1 C1002
T8-JV6TRT-FCN FRONT CABINET ASSEMBLY 1
42-51208D-XX3 SPEAKER YDA512-6C 8 OHM 5W 2
4A-LCD20T-CM2 20"CMO TFTSCREEN V201V1-T03 1
81-BLI006-XX4 INVERTER 1
T8-JV6TRT-FCNZ ASS'Y-ARFFRONTCABINET 1
55-803700-0UA1B FRONT CABINET 1
56-707220-0HA4R POWER KNOB 1
56-804690-0HA4R PUSH BUTTON 1
57-804860-0HC1B DECORATE BAR 1
T8-JV6TRT-PAN PACKING ASSEMBLY 1
49-204260-BAT 7# BATT. UM4 R03P SIZE AAA 2
51-PC0220-0ZU08 POWER CORD 1
54-LCPVC1-001 PROTECT INLAY 1
81-ADT125-201 ADAPTER SAWA-02-520 1
T8-JV6TRT-PANZ ASS'Y-ARFPACKINGPARTS 1
T8-JV6TRT-RCN REAR CABINET ASSEMBLY 1
63-B30120-AB3 S/T SCREW B 3.0 X 12 4 MTG REAR CAB -FRONT CAB
64-F40080-103 M/C SCREW F 4 X 8 6 MIG REAR CAB & HINGE- ASSEMBLY
T8-JV6TRT-RCNZ ASS'Y-ARFREARCABINET 1
55-718300-0HA1A COVER BOARD(LEFT) 1
55-718310-0HA1A RIGHT COVER 1
55-803710-0UA1B REAR CABINET 1
55-803730-0HA1B BASE SUPPORT COVER(LEFT) 1
55-804790-0HA1B BASE SUPPORT COVER(RIGHT) 1
58-20B6MP-0UI1A PLATE MODEL NO. 1
58-805930-0UI1B INLAY(LEFT) 1
58-805940-0UI1B INLAY(RIGHT) 1
T8-JV8AXT-DIY DIGITAL BD ASSEMBLY 1
09-0BAV99-ATX HIGH SPEED DOUBLE DIODE BAV99 6 D8;D7;D6;D4;D1;D3
09-BAV70L-ATX SMD. DIODE BAV70LT1(SOT-23) 215 2 D5;D2
09-FM4001-ETX SMD.DIODE FM4001 2 D12;D11
09-LL4148-ATX SMD. SWITCHING DIODE LL4148 1 D10
10-1N5820-F0X DIODE 1N5820 1 D9
12-BC847C-0BX SMD.TRANSISTOR BC847C 7 Q6;Q5;Q4;Q3;Q2;Q10;Q1
12-BC848B-0BX TRANSISTOR BC848B 1 Q11