Akira LCT-27KXSTP Schematic
LCT TV
Service Manual
-2 -
MODEL:
LCT-27KXSTP
Model No.: LCT-27KXSTP
Version: 1.0
-3 -
CONTENTS
SPECIFICATION..................................................................................................................................... 4
BLOCK DIAGRAM ................................................................................................................................7
CIRCUIT DIAGRAM.............................................................................................................................. 8
PCB BOARD .........................................................................................................................................24
EXPLODED VIEW................................................................................................................................ 34
PART LIST............................................................................................................................................. 35
Model No.: LCT-27KXSTP
Version: 1.0
-4 -
SPECIFICATION
FEATURES:
Power supply: AC 100~240V 50/60Hz
Multi TV system: PAL BG /DK /I /M /N, NTSC M/N, SECAM BG /DK /LL’
Multi standard sound processors: NICAM, FM-stereo, BTSC
Multi Video system: PAL /NTSC /SECAM
Versatile input sources: TV, Video, S-Video, Scart, YcbCr, YpbPr, DVI, PC (analog)
Full function remote controller
Excellent sound effect with volume, trable, bass, balance AVC adjustable, Audio mode, special
effect, equalizer
Smart sound & picture mode set: Personal, cinema, speech, music, standard, personal, bright, mild
Adaptive 2/4 line comb filter for PAL /NTSC
VTR for weak and distorted signal from video tape recorder
10 pages teletext
Automatically turn off the set when signal absent longer than 10 minutes.
150 channels
Blue screen display
CC /V-CHIP
Freeze picture
Program label
Sleep
Screen size change
Standby
Channel swap
Model No.: LCT-27KXSTP
Version: 1.0
-5 -
GENERAL SPECIFICATION
PART 1: TV SET
200watt (max) Power consumption
≤3watt (stby)
TV receive system PAL D/K I B/G M/N SECAM L/L’ D/K B/G
NTSC M/N
Video system Multi PAL /SECAM /NTSC
Vision intermediate frequency 38.9MHz, 33.95MHz (L’)
Inter-carrier frequency
Channels received
Tuning mode PLL SYSTEM
AV In /Out
AV In /Out specification
Antenna input impedance 75Ω
Audio output power 6W x 2 (1KHz, 0.5Vrms, 10%THD)
5.5 MHz (B/G)
6.0 MHz (I)
6.5 MHz (D/K, L/L’)
5.85 MHz (NICAM B/G, D/K, L)
6.55 MHz (NICAM I)
5.74MHz (GERMAN STEREO)
4.5MHz (BTSC)
BG /DK/ L: 34.47MHz CHROMA if frequency
L’: 38.38MHz
VHF-L 46.25 - 163.25MHz
VHF-H158.25 - 466.25MHz
UHF 471.25 - 855.25MHz
1 AV in, 1 S-Video In
Scart in, YcbCr In, YpbPr IN
1 AV out
Y/C IN-Y: 1.0± 0.2
Video In ---1.0 ±0.2V
Audio In --- Approx, 500mV
Video Out --- 1.0±0.2V
Audio Out ---Approx, 400mV
RGB In: ≤0.7V
English /Spanish /Italian OSD language
German /French /Russian /Portuguese / Poland
/Turkish /Croatian /Serbian /Macedonian
/China-Simple /China-Traditional
Note: OSD language has only 5 language
p-p
75Ω C:0.7V
p-p
75Ω
p-p
75Ω
p-p
p-p
75Ω
Model No.: LCT-27KXSTP
Version: 1.0
-6 -
Continue shine POWER ON LED indicator
Flash standby
Hand set power supply Battery 1.5V (AAA) x 2
PART 2: PC RESOLUTION
Analog RGB In 0.7V
DVI In 0.7V
RESOLUTION V.Feq (Hz) h. Feq. (Hz) Graphic Mode
640 x 480 59.940 31.469 VGA
800 x 600 60.317 37.879 VGA
1024 x 768 60.004 48.363 VGA
1280 x 720 59.870 47.776 VGA
PART 3: PANEL
Brand & model CHIMEI /V270W1-L03
Resolution 1280 x 720
Displayable color 16.7MHz
Surface Hard coating + Anti-Radiation
Viewing Angle (H/V) 170o (Hor) /170o (Ver)
Display Response Time 16ms
Contrast Ratio 1:600
Brightness 550nit
Aspect 16:9
Lamp Life 50,000Hrs
Bad Pixel Quality (Bright /Dark /Total) 2 /6 /8
p-p
p-p
Model No.: LCT-27KXSTP
Version: 1.0
BLOCK DIAGRAM
-7 -
7654321
8
D
S_VIDEO IN
TUNER
AV IN
YCrCb
SCART
U6
TELETEXT CCD/VCHIP
EEPRAM
U4
VIDEO
DECODER
U24
VIDEO
SWITCH
U7U8
C
PC
YPrPb
U3
SYNC
U10
SWITCH
U11
ADC
U1
DVI
DAC
UC
U14
BUFFER
U9
SDRAM
DEINTERLACER
UB
BUFFER
U21
SWITCH
U5
EEPRAM
FLASH MEMERY
U17
U18
CPU/SCALER
UD
RESET
U2
BUFFER
UE
AMP
LVDS
U19
LCD PANEL
D
C
B
TV AUDIO
AV AUDIO
SCART AUDIO
HDTV AUDIO
AUDIO
DECODER
POWER
AMP
A
POWER
1 2 3 4 5 6 78
24VDC
11----20VDC
5VDC
5VDC_SB
3VDC_SB
STAND BY
Model No.: LCT-27KXSTP
Version: 1.0
I2C
B
A
CIRCUIT DIAGRAM
D
C
B
A
-8 -
7654321
OVCC CVCC PVCC AVCC
82
97
6
18
VCC367VCC238VCC1
PVCC
AVCC
R1
96
EXT_RES
510R
DVI1
DATA2/4_SHLD
DDC_DATA
DATA1/3_SHLD
H_PLUG_DET
DATA0/5_SHLD
CLK_SHLD
DVI
VCC
IC1
VIN3VOUT
LT1117-3.3V
AVCC AVCC AVCC AVCC AVCC PVCC PVCC
C3
0.1
1 2 3 4 5 6 78
SHELL1
DATA2-
DATA2+
DATA4-
DATA+
DDC_CLK
A_VSYNC
DATA1DATA1+
DATA3DATA3+
DATA0DATA0+
DATA5DATA5+
CLK+
A_RED
A_GREEN
A_BLUE
A_HSYNC
A_GND
SHELL2
C4
0.1
GND
CLK-
1
+5V
GND
C5
0.1C60.1
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25(C1)
26(C2)
27(C3)
28(C4)
29(C5)
32
47uF/16V
2
C1
C7
0.1C80.1C90.1
GSCLV
DDCDV
DVC1
L2
2
112
22uH
L3
22uH
L4
22uH
C2
0.1
L5
22uH
GSCLV
DDCDV
7,9
3,7,9
9
OVCC
PVCC
AVCC
CVCC
OVCC OVCC OVCC OVCC OVCC CVCC CVCC CVCC
C11
C12
C13
0.1
0.1
0.1
DIGSEL
PD
C14
0.1
CVCC
R2
1K
R187
0
C15
C16
0.1
0.1
R10
1K_NS
90
RX0p
91
RX0m
85
RX1p
86
RX1m
80
RX2p
81
RX2m
93
RXCp
94
RXCm
100
OCK_INV
4
PIXS
1
DFO
7
STAG_OUT
3
ST
9
PDO
2
PD
99
RSVD
CVCC
C17
C18
C19
0.1
0.1
0.1
OVCC578OVCC457OVCC343OVCC229OVCC1
OGND119OGND228OGND345OGND458OGND576GND15GND239GND368PGND98AGND179AGND283AGND387AGND489AGND5
U1
AVCC495AVCC388AVCC284AVCC1
8
SCDT
10
QE0
11
QE1
12
QE2
13
QE3
14
QE4
15
QE5
16
QE6
17
QE7
20
QE8
21
QE9
22
QE10
23
QE11
24
QE12
25
QE13
26
QE14
27
QE15
30
QE16
31
QE17
32
QE18
33
QE19
34
QE20
35
QE21
36
QE22
37
QE23
49
QO0
50
QO1
51
QO2
52
QO3
53
QO4
54
QO5
55
QO6
56
QO7
59
QO8
60
QO9
61
QO10
62
QO11
63
QO12
64
QO13
65
QO14
66
QO15
69
QO16
70
QO17
71
QO18
72
QO19
73
QO20
74
QO21
75
QO22
76
QO23
44
ODCK
46
DE
47
VSYNC
48
HSYNC
40
CTL1
41
CTL2
42
CTL3
SII161
92
R11
RP1
RP3 47
RP2 47
RP4
RP5 47
RP6 47
1
1
GB0
47
47
47
R12
T2
1
T1
2
GB1
GB2
GB3
GB4
GB5
GB6
GB7
GG0
GG1
GG2
GG3
GG4
GG5
GG6
GG7
GR0
GR1
GR2
GR3
GR4
GR5
GR6
GR7
R13 47_NS
T3
GCLK
GFBK
6,7,8
GVS
GRAPHIC
47
DVI-DE
8
D
C
B
A
Model No.: LCT-27KXSTP
Version: 1.0
-9 -
7654321
D
C
B
CN14
CON6
CN12
CON6
TVVIN
1
GND
2
BLANKING
3
4
GND
5
TV-AUDIO
SCART_L
6
SD
5
SCART_R
4
SL
3
SD
2
SR
1
A
TV-VIN
BLANKING
S-B
3.3uHR239 75
S-G
3.3uHR240 75
S-R
3.3uHR241 75
GND
S-R
S-G
S-B
GND
RGB/V
RGB/V
R242 75L45
R243 75L46
R244
75L47
SCART
20
1819
1617
1415
1213
1011
89
67
45
23
1
SCART
R230 1K
C251
330pF
C252
330pF
C253
330pF
S-B
S-G
S-R
GND
VIN
VIN
ZD1
ZENER3
R8 1K
R9 1K
100uF/16V
ZD2
ZENER3
R236
10K
C23
R237
10K
SW
R17
SCART_L
SCART_R
R15
10K
R16 10K
R19 47
SW
C8
100uF/16V
GND
10K
Q15
9014
VCC
R25
47
Q12
9014
R26
1K
VCC
R18
10K
Q17
9014
R20
47
R22
1K
GND
SCART
Q13
9014
SCART
GND
R21
47
R24 10K
R23
10K
R27
10K
TV-AUDIO
C10
100uF/16V
TVVIN
GND
1 2 3 4 5 6 78
8
D
C
B
A
Model No.: LCT-27KXSTP
Version: 1.0
-10 -
VSYNC
8
D
7
C
B
A
7654321
D
PWCS0#
PWD0
PWD1
PWD2
PWD3
PWD4
PWD5
PWD6
PWD7
MEM_BUS
9,10
CLK
VCC
3
1D
4
2D
7
3D
8
4D
13
5D
14
6D
17
7D
18
8D
74HC374
GND
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
OE
U2
11
VDD
20
2
5
6
9
12
15
16
19
1
10
MUTE
C
CON5 is for LCD control (J24's) supplement,
11
LCDON
11
BKLON
PD
4,9
LVDSON
12
680R
680R
0
LED1
GREEN
LED2
DIGSEL
R38
R39
R40
DIODE
DIGSEL
MUTE
CN5
1
2
CON2
7
7
BUF-VS
1
BUF-VS
22R
7
HSYNC
R35
22R
R36
C25
2.2K
22P
C26
R37
22P
2.2K
R34
BUF-HS
BUF-HS
U3
1
2
3
4
5
6
7 8
74hc14a
VFF
14
13
12
11
10
9
1,7,9
7
7,1 7,1 7,1
B
VCC VCC VCC VCC VCC VCC VCC VCC VCC VCC VCC
2
K
A
1
D1
3
BAV99L
DDCD
R29
10K
D2
BAV99L
DDCC
R30
10K
D3
BAV99L
RED
D4
BAV99L
GREEN
D5
BAV99L
BLUE
D6
BAV99L
BUF-HS
R44
2K
D7
BAV99L
BUF-VS
R45
2K
R184 10K
VIN
VIN4
YSOG
VIN
VIN4
YSOG
1
2
3
4
5
6
7
U21
0Y
2Y
YOUT
3Y
1Y
INH
VEE
VSS8B
VDD
XOUT
CD4052
VCC
R223
10K
2X
1X
0X
3X
A
VCC
C234
16
0.1
15
14
13
12
11
10
A
9
B1
R225
10K
VIN YSOG
R224
10K
DEN
DDEN
DVI-DE
A
B1
A
1 2 3 4 5 6 78
Model No.: LCT-27KXSTP
Version: 1.0
-11 -
7654321
D
C62
R59
100
VOUT
4
VOUT
4.7
VOUT
VINHS
VINVS
SDA
RST1#
C246
SCL
RST1#
4.7
R204
0
R66
VAA
R202
5.6K
100
C
+12
R205
22K
L41
FB
3
C249
100uF/16V
IC9
7805
IN
1
OUT
GND
2
B
L42
FB
GND GND
VAA
C208
100uF/16V
GND
A
1 2 3 4 5 6 78
VAA
R62
5.6K
R63
22K
GND GND
VAA
R203
47
Q2
9014
R206
470
4,6,8,9
C244
0.1
VAA
C20
0.1
V33VT
R64
47
Q3
9014
C63
R60
470
R207
R209 1K
0.1
470
VID_BUS
R80
24K
20pF
BLUE
VDS
RED
BLUE
PWM
PW7
PW6
PW5
PW4
PW3
PW2
PW1
PW0
P0_7
P0_6
P0_5
P0_4
P0_3
P0_2
P1_5
P1_4
P1_3
P1_2
P1_1
P1_0
COR
VDD
SDO
RED
BOX
VAA
C65
0.1
GND
VAA
GND
12
16
GND
18
2
3
17
C67
8
R75
9
LPF
5264
6.8K
C77
35
34
33
32
1
30
8
7
6
5
4
3
2
21
20
19
18
17
16
R210 10K
52
51
48
47
46
45
29
27
15
DA
14
CL
GND
C54
C78
6.8nF
0.1
R31
10K
R192
R67 470
R193
R194
R69 470
D13
IN4148
68nF
V33VT
0.1
470
470
470
R32
10K
V33VT
D14
IN4148
R196
R198
R200
GND
C71
75
R74
R76
75
GND
470
470
470
U6
5
6
7
8
SDA
SCL
TEST
VCC
GND
A2
A1
A0
24C16
33pF
C72
0.22
V-RED
C69
33pF
C73
0.22
C70
33pFR68 470
C74
0.22
4
3
2
1
V-RED
V-GRN
V-GRN
V-BLU
V-BLU
V-BOX
V-BOX
C75
33pF
VDD V33VT
L8
FB
U26 bypass cap
C80
100uF/16V
VAA
C38 is the bypass cap for Q1
C64
0.1
GND
R61
470
CVBS0
SCL
SCL
SDA
SDA
VINVS
VINHS
C21
CVBS0
0.1
X2
12.000M
R208
5.6K
C61
20pF
Q1
9015
RST1#
R232
10K
C60
VAA
CCVIN
VINHS
VINVS
SDA
SCL
R73 10K
GND GND
49
SCL
50
SDA
37
VSYNC
36
HSYNC
23
CVBS0
24
CVBS1
25
FILT
26
IREF
42
XO
41
XI
40
XGND
43
RESET
28
TEST
9
ADC0
10
ADC1
11
ADC2
12
ADC3
R65
0_NS
7
5
13
14
15
4
10
6
1
11
31
VDDA
22
V33VT
GNDA
U7
VIDEO
HS_IN
VS_IN
SDA
SCL
SEN
PREF
SMS
ASEL
VSSA
Z86229
39
VDDC
U8
13
GNDC
44
VDDP
38
SDA_NV
SCL_NV
GNDP
GREEN
CSYNC
GREEN
FRAME
8
D
C
C22
0.1
B
A
Model No.: LCT-27KXSTP
Version: 1.0
-12 -
7654321
CN3
CON2
2
1
5,6,9,10,11
D
C
S-CIN
S-YIN
SAGND
SAGND
SAGND
SAGND
SAGND
SAGND
SAGND
HD-Y1
HD-Y
B
HD-Pb1
HD-Pb
HD-Pr1
HD-Pr
AV-IN
SAGND
S-VIDEO1
5
GND
GND
GND
X
2
X
2
X
2
5
CON9
Y
Y
Y
VOUT
VOUT
RST1#
RST1#
SDA
SCL
1
2
3
4
5
6
7
8
9
SDA
SCL
SCL
13
14
15
SCL
SDA
CLK560FPDAT58CLK2024ASGND7ASGND64GND11APGND25APVDD26PLGND30YGND35CGND46SPGND51AFGND65ISGND68ISGND77ISGND80I2CSEL
GND
R245
0_NS
R246
0_NS
R247
0_NS
YCb
YCr
AV-IN
S-CIN
S-YIN
YY
2
TV-VIN
R71 1.2K
TGND
GND
VIN4
VIN4
YSOG
GRN
RRED
V-BOX1
R216
10K
3.3uHR52 75
3.3uHR53 75
3.3uHR54 75
R218
10K
GND
GND
GND
BLU
YY YCb YCr YCb2 YY2 YCr2
R212
R214
10K
10K
R220
10K
R56 75L9
R57 75L10
R55
C58
20pF
C59
20pF
R49 2K
R50 75
R51 75
R58 75
75L11
GND
R222
10K
C55
330pF
C56
330pF
C57
330pF
C255 0.22
X1
20.25M
C27
0.68
C28
0.68
C31
1nF
C29
0.68
C30
0.68
C37
0.22
C38
0.22
C39
0.22
C256 0.22
C254
0.22
74
VIN3
73
VIN2
71
CIN
72
VIN1
75
VIN4
5
Y2/G2
4
U2/B2
6
V2/R2
2
Y1/G1
1
U1/B1
3
V1/R1
79
FBIN1
62
XTALI
63
XTALO
2
TV-VIN
G
B
R
1
1
1
V-BLU
V-BOX
RGB/V
R251 6.8K
S-B
V-GRN
S-G
V-RED
S-R
V-BOX
A
SDA
SCL
VDD
C53
0.1
1 2 3 4 5 6 78
U5
5
SDA
6
SCL
7
TEST
8
VCC
GND
4
3
A2
2
A1
1
A0
24C16
C32
1nF
VDD
C36
0.22
10
12
29
VDD
VDDCAP9GNDCAP
RST#
70
VOUT
U4
VPC3230D
C44
47nF
C33
1nF
R248 0_NS
R249
0_NS
R250
0_NS
VSS
16
2
S1A
3
S2A
5
6
11
10
14
13
1
15
VCC
S1B
S2B
S1C
S2C
S1D
PI5V330
S2D
IN
EN
GND
8 U24
GND
VDD +5
36
45
52
69
CVDD
YVDD
PLVDD
SPVDD
4
DA
7
DB
9
DC
12
DD
AFVDD
V-BOX1
GND
76
ISVDD
BLU
GRN
RRED
VCC is 5V power supply from the power socket VDD is 3.3V digital power supply, +5 is 5V
analog power supply for U1 VPC3230D; VTT is 5V power supply for U2 FI1256MK 2 (TV Tuner)
59
VREF
78
VREF
66
VRT
VSTBY
47nF
19
FFIE
20
FFWE
21
FFRST
22
FFRE
23
FFOE
31
Y7
32
Y6
33
Y5
34
Y4
37
Y3
38
Y2
39
Y1
40
Y0
41
UV7
42
UV6
43
UV5
44
UV4
47
UV3
48
UV2
49
UV1
50
UV0
27
LLC2
28
LLC
54
AVO
55
HCLP
56
HS
57
VS
53
INTLC
16
TEST
17
VGAV
18
OE#
67
47
47
L38
11R/100MHZ
YCr2
YCr
YCb2
B
YCb
RP7
RP8
U22
BY
BX
CY
C
CX
INH
VEE
VSS C
CD4053
GNDGND GND GND
L39
11R/100MHZ
VDD
AY
AX
C43
C45
47nFC42
10uF
VINY7
VINY6
VINY5
VINY4
VINY3
VINY2
VINY1
VINY0
VINCK
VHREF
VINHS
VINVS
VIODD
R
B
G
A
YY2
YY
A
B
R185 10K
C46
10uF
VIDEO BUS
+12
+5
(VSTBY)
C47
C48
10uF
0.1
GNDGND
VID_BUS
VDD
C49
0.1
+5
C40
0.22
Q9
R186 1K
C76
9014
0.1
8
D
5,6,8,9
C52
C51
C50
0.1
0.1
C34
C41
1nF
0.22
S/Y
GND
C
0.1
C35
1nF
B
A
A.1
Model No.: LCT-27KXSTP
Version: 1.0
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