TCL LCDTV27V6 Schematic
27″ LCD TV TCL LCDTV27V6
Service
Service
Service
31.5KHz-60KHz
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
1. Monitor Specification..............................………........3
2. Operating Instructions…………………….……….......4
2.1 The Use Of Remote Control..……………...................4
2.2 The Use Of Teletext……..........…...........…...........5
2.3 Front Panel Control Knobs.…............……...............6
2.4 OSD Operations .………........................…............7
2.5 How To Connect ……..............……………............15
3 Input/Output Specification…………..........................19
3.1 Input Signal Connector……..........................19
3.2 RGB Input Signal Timing …….....……......................20
4. Mechanical Instructions…………………..................21
5. Repair Flow Chart ……………………….……….....24
6. White Balance Luminance Adjustment….…........30
7. PCB Layout ………….……………………....….......34
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
7.1 Main Board.……….......................................34
7.2 Power Board……..……..............................36
7.3 Key Board…...................................39
7.4 IR Board …................….......................39
7.5 DC-DC Board....…………...............................41
7.6 Earphone Board..…….....…..........................42
8. Block Diagram.…….........................................43
8.1 Main Board.………………………………..….43
8.2 Power Board…..…....………………….......44
8.3 Exploded View..……….....................…..45
9. Schematic Diagram…………………………...46
9.1 Main Board……………..…..………………………..46
9.2 Power Board.............….....................................58
9.3 Tuner Board......................................................60
9.4 Earphone Board……………...………………….63
10. BOM List…............................................................64
Horizontal Frequency
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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27″ LCD TV TCL LCDTV27V6
Revision List
Version Release Date Revision Instructions TPV Model
A00 Sep-05-2006 Initial Release E276MTNLC3TLNP
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27″ LCD TV TCL LCDTV27V6
1. Monitor Specifications
Item Spec
Screen Size 27”(69cm) TFT-LCD Panel
Panel type V270B1-L03 C1
Aspect Ratio 16:9
Resolution 640 x 480 up to 1280×768 / 60Hz
Active Area 596.259(H) mm x 335.232(V)mm
Pixel Pitch 0.4365mm x 0.4365mm
LCD Panel
VGA Function
TV Function
Video Input CVBS/S-VIDEO/COMPONENT/HDMI
Display Colors 16.7 million
Contrast Ratio 1200:1(Type)
Brightness
Viewing angel(CR≥20) 176° H/ 176°V
Response Time(Gray to Gray) 6.5ms
Lamp Life 60,000 hr(Type)
Color Temperature Cool / Warm/Normal
Input support definition 640*480 /60Hz
Audio input Mini jack for stereo headphones (3.5ø)
TV System PAL B/G
Video systems NTSC/PAL
500 cd/㎡(Type)
Audio output Audio output: L / R
OSD Language
(default)
Table Stand Yes
English
Speaker (built-in): Two 15 watt (max.) speakers
Headphone Mini-jack for stereo (3.5ø)
Wall Mount VESA 100 x 100 mm
Power
Panel Tilt
Environment
Dimension 694(W) x 530(H) x 275(D) (mm) (without packed)
weight 13.5 Kg (Net)
Power AC100V-240V, 50±3 Hz ,60±3Hz
Power Consumption <150W
Forwards/Backwards/
Rotation
Operation Temperature + 0 °C ~ + 40 °C
storage Temperature -10 °C ~ + 50 °C
Operating Humidity 10% ~ 85%
-4°/ +18° / ± 35°
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27″ LCD TV TCL LCDTV27V6
2. Operations Instructions
2.1 The Use of Remote Control
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27″ LCD TV TCL LCDTV27V6
2.2 The Use Of Teletext
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27″ LCD TV TCL LCDTV27V6
2.3 Front Panel Control Knobs
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27″ LCD TV TCL LCDTV27V6
2.4 OSD Operations
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
2.5 How to Connect
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
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27″ LCD TV TCL LCDTV27V6
3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord
must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical
conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer
should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on
the connector to ensure firm grounding. The connector information is as follow:
1
6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description
1 Red Video
2 Green Video
3 Blue Video
4 Not used
5 GROUND
6 Red Video Ground
7 Green Video Ground
8 Blue Video Ground
9 No Pin
10 Sync. Ground
11 Not used
12 Serial Data for DDC
13 Horizontal Sync.
14 Vertical Sync.
15 Serial Clock for DDC
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel
warm-up. The Power-On indicator lights "GREEN" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and
contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal
cable to the PC.
If your TV requires service, it must be returned with the power cord.
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27″ LCD TV TCL LCDTV27V6
3.2 RGB Input Signal Timing
Horizontal Vertical Sync Polarity Presence Screen Mode
Dots × Lines
720×400 31.47 70.08
640×480 31.50 60.00
640×480 37.50 75.00
640×480 37.86 72.81
800×600 37.90 60.32
800×600 46.90 75.00
800×600 48.08 72.19
1024×768 48.40 60.00
1280×768 47.7 60
Frequency Frequency Horizontal Vertical Horizonta Vertical Normal FULL
(kHz) (Hz) (4:3) (16:9)
NEG POS YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
NEG NEG YES YES YES YES
YES YES YES YES YES YES
YES YES YES YES YES YES
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27″ LCD TV TCL LCDTV27V6
4. Mechanical Instructions
Step Figure Description
Preparation
Remove
the base
Remove
the back
cover
Lay the LCD-TV
on a flat, soft and
clean surface.
Remove the
screws marked
in red.
Remove the
screws marked
in red.
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27″ LCD TV TCL LCDTV27V6
Remove
the shield
Remove the
screws marked
in red
Remove
the boards
Remove the
screws marked
in red and
disconnect the
connector or wire
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27″ LCD TV TCL LCDTV27V6
Remove
main frame
Remove the
screws marked
in red.
Remove
the panel
Remove the
screws marked
in red.
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27″ LCD TV TCL LCDTV27V6
5. Repair Flow Chart
5.1 No Power (No LED indicator)
Check power cord and board interface
OK
Check F901, BD901, D901, D902
NG
OK
Check the load
Check IC981, D928 (12V)
NG
OK
Check Q924, IC924 (ON/OFF signal)
OK
Check IC941, Q941
NG
OK
Check T951
NG
OK
Check IC901, Q901
NG
OK
Check Q942, Q943
NG
OK
Check IC927
NG
NG
Replace F901 or BD901 or D910 or D902
Replace IC981or D928
NG
Replace IC941, Q941
Replace T951
Replace IC901 or Q901
Replace Q942 or Q943
Replace IC927
Plug in power cord and interface
Replace Q924 or IC924
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27″ LCD TV TCL LCDTV27V6
5.2 Can not start (LED indicator yellow)
Check key board
NG
Repair the key board
OK
Check 5V_SB
NG
Return to “5.1”
OK
Check 3.3V_SB
OK
NG
Replace U701
Check Q704, Q705, Q706, Q709
NG
Replace Q704 or Q705
or Q706 or Q709
Check PWR_ON signal
NG
Check U32, U21
NG
Replace U32 or U21
OK
Check I2C communication
Check Panel inverter board
NG
Replace panel
Check PFC circuit
NG
Replace IC901 or Q901
OK
Check main board power supply
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27″ LCD TV TCL LCDTV27V6
5.3 No display (LED indicator green)
Check the source
NG
Reset source
OK
Check LVDS cable
NG
Reset LVDS cable
OK
Check 24V power supply
NG
Return to “5.1”
OK
Check main board power supply
OK
Check U21
NG
Replace U21
OK
Check I2C communication
OK
Check panel
NG
Replace panel
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27″ LCD TV TCL LCDTV27V6
5.4 Abnormal display
Check the source
NG
Reset source
OK
Check signal filter circuit
NG
Replace the filter or inductance
RF signal Check TV system setup
OK
OK
Check Tuner
NG
Replace Tuner
OK
AV, SCART1/2_CVBS signal
Check U3
NG
Replace U3
S-video SCART2_Y/C signal
OK
PC signal
Check U11
NG
Replace U11
Check U21, U20
NG
Replace U20
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27″ LCD TV TCL LCDTV27V6
5.5 No sound
Check the source
Reset source
Check signal filter circuit
OK
NG
Replace the filter or inductance
Check Earphone jack
NG
Replace the Earphone jack
OK
SIF signal Check TV system setup
OK
Check Tuner
NG
Replace Tuner
AV, AIR1/AIR2, PC signal
Check Audio decoder MSP3410G U4
NG
Replace U4
OK
Check U63, U61
NG
Replace U63 or U61
OK
Check Amplifier MAX9714 U60
OK
Check speaker
NG
NG
Replace U60
Replace speaker
5.6 Key Board
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