Akai LCT2060 schematic
LCT2060
LCD TV
SERVICE MANUAL
IMPORTANT INFORMATION
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
The lightning flash with arrowhead symbol, within an equilateral triangle,
is intended to alert the user to the presence of uninsulated "dangerous
voltage” within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within a triangle is intended to alert the user to the
presence of important operating and maintenance(servicing)instruction
accompanying the product.
CONTENT
Safty Precaution ................................................................................................................................page 1~ 1
Technical Specifications .....................................................................................................................page 2~ 2
Trouble Shooting Flow Chart ...............................................................................................................page 3~ 5
Block Diagram ....................................................................................................................................page 6~ 6
Wiring Diagram ...................................................................................................................................page 7~ 7
Main Board ........................................................................................................................................page 8~22
Control Board.....................................................................................................................................page23~25
AV Board ...........................................................................................................................................page26~28
Replacement Part List ........................................................................................................................page29~29
Basic Operation .................................................................................................................................page30~31
Firmware Upgrade method..................................................................................................................page32~32
Specification for Adjustment ...............................................................................................................page33~34
Exploded Drawing ..............................................................................................................................page35~35
Disassembly Instruction .....................................................................................................................page36~39
Addendum:
Product Specification of Panel
Specification of Major ICs
SAFETY PRECAUTION
Earth ring
Earth
l In order to prevent you from any possible injury caused by high voltage, please do not touch the inverter directly
while repairing the unit.
l While adjusting the unit, be sure to groud connected instruments adn your body to prevent sstatic electricity
destroying the ICs.
(Lead wire)
Pick-up case
Chassis (GND)
Resistor
1M~10M
ΩΩ
l Safety Caution
In order to prevent you from any possible injury caused by high voltage, please do not touch the inverter directly
while repairing the unit.
high voltage
While adjusting the unit, be sure to ground connected instruments and your body to prevent Static electricity
destroying the IC.
1
TECHNICAL SPECIFICATIONS
Screen Size............................................................................................................................20 TFT-LCD Panel
Aspect Ration ............................................................................................................................................... 4:3
Contrast Ratio........................................................................................................................................... 600:1
Brightness ......................................................................................................................................... 500 cd/m
High color saturation .......................................................................................................................NTSC 7 5 %
Pixel Pitch(HXV) ...............................................................................................................0.2125mm 0.6375mm
Display colors.......................................................................................................................................... 0.26M
Response Time(Tr/Tf) .................................................................................................................................. 8ms
Viewing Angles Horizontal .................................................................................................................. 80 Degree
Viewing Angles Vertical ...................................................................................................................... 70 Degree
TV Tuning Compatible ......................................................................................................... NTSC 181 Channels
Special Features:
................................................................................................................................................................. MTS
...................................................................................................................................................... Sleep Timer
........................................................................................................................................2D comb filter (option)
........................................................................................................................................................Deinterlace
............................................................................................................................................................... V-chip
..................................................................................................................................................Closed Caption
................................................................................................................................Full function remote control
Supported Signal Resolution Mode:
PC mode ..............................................................................................................................................800x600
Component .................................................................................................................... 480i, 480p, 720p, 1080i
CVBS.......................................................................................................................................................... 525
S-Video ....................................................................................................................................................... 525
Power Input ................................................................................................................................................ 12V
Front Panel Control Button ............................................................................... Power, Source, CH+/ -, VOL+ / -
Accessories:
................................................................................................................................... 32 Keys Remote Control
.......................................................................................................................................... AA Size Battery x 2
............................................................................................................................................... Intruction Manual
............................................................................................................................................................AC Cord
........................................................................................................................................................AC Adapter
Safety & EMI .....................................................................................................................UL/cUL,FCC,BETS-7
Power Consumption ......................................................................................................................... 48W (MAX)
Power Supply ............................................................................................................. AC:100V ~240V 50/60Hz
Operation Temperature ....................................................................................................................... 0oC ~45oC
Storage Temperature............................................................................................................From -10C To 6 0 C
2
2
TROUBLE SHOOTING FLOW CHART (1)
Mainboard
check REG3 REG5 output
No picture
F1,F2
Black picture
check U4 (voltage=1.8&3.3V)
check crystal X1
Panel
check Inverter
panel bad
Mainboard
check REG3 REG5 output
White picture
Color NG
check U4 (voltage=1.8&3.3V)
Video NG
check crystal X1
check FFC CABLE
Panel
panel bad
Mainboard
check U4
Video issue
Line in picture
check FFC CABLE
Panel
panel bad
Mainboard
check REG3 REG5 output noise
Noise
check U4
TV
check ANT
Superimposed image
Mainboard
check U4
3
TROUBLE SHOOTING FLOW CHART (2)
Check crystal Y1
Check U5 pin44,pin45 signal
Check U5 pin20,pin21 output signal
Sound issue
R or L no output
Mainboard
Check U2 pin8 ,pin12 output
Check U7 pin3,pin13 output
Noise
spaker bad
TV
Check TIC2 Output
Check U2 Output
Output low
spaker bad
TV Check TIC2 SIF Output
No sound Check U5 pin20,pin21 output
Other I/P REG6 power output(+8V)
Check U7 pin9,pin10 control signal
Check U2 pin7=12V
Check U2 pin5 mute signal
Speaker bad
Check U7 Output
Check U5 Output
All source Check U2 Output
All source Check U7 Output
Check U5 Output
TV check ANT
Check U5 Output
4
TROUBLE SHOOTING FLOW CHART (3)
Check F1,F2
No Power
REG3,REG5 Power Output
Power on NG
Check U3,U4 voltage
Check REG3 Power Output
NO Backlight
Check F1
Check Panel & Inverter board
Switch NG
key board bad or check W3
No work
Check REG5 Output,W3 wire
Remote control
Check key board XIC1
Check U1 pin10,U4 pin2
Function issue
Invalidity
Remote contro bad
Remote control battery bad
Power Led NG
Key Board
LED NG
W3 connect touch bad
Key Board
Check U1 pin6,pin9
Check U1 (pin4=5V)
Power board bad
Automatic on/off
POWER
main board bad
5
BLOCK DIAGRAM
(TUNER)
AV I/P BOARD
6 6
WIRING DIAGRAM
L-CH
123456789
12345J11234567
8
12345678910111213141516171819
20
J10
MAIN BOARD
SPEAKERSPEAKER
R-CH
From LCD Panel
FCC Cable to LCD Panel
INVERTER
8
7
6
5
4
W3
3
2
1
5
4
3
J3
2
1
2
J4
1
2
J5
1
KEY/IR
CN1
8
7
6
5
4
3
2
1
CON-8
From LCD Panel
AV-IN
CON1
J2
J3
1 2
3 4
5 6
7 8
9 10
11 12
J1
13 14
15 16
17 18
19 20
7 7
MAIN BOARD CIRCUIT (1)
8 8
1
8
MAIN BOARD CIRCUIT (2)
5
D D
4
3
2
1
NC(WAFER 7-2.0_NC)
C C
B B
A A
28
5
4
3
2
1
9 9
MAIN BOARD CIRCUIT (3)
5
D D
C C
4
3
200K
2
100K 75K
1
47K
15K
30K
B B
A A
3
5
4
3
2
1
8
10 10
MAIN BOARD CIRCUIT (4)
5
D D
47pF
C C
47pF 75 1%
BAV99L
B B
75 1%
0.1uF
0.1uF
4
3
2
1
BAV99L_NC
1nF
100K
1nF
BAV99L_NC
47pF
47pF
75 1%
75 1%
2N3904
A A
2N3904
4
5
4
3
2
1
8
11 11
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