LCT TV
Service Manual
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MODEL:
LCT-20KXST
Model No.: LCT-20KXST
Version: 1.0
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CONTENTS
SPECIFICATION..................................................................................................................................... 4
MAIN BOARD ........................................................................................................................................7
CIRCUIT DIAGRAM.............................................................................................................................. 8
PCB BOARD .........................................................................................................................................21
EXPLODED VIEW................................................................................................................................ 32
PART LIST............................................................................................................................................. 35
Model No.: LCT-20KXST
Version: 1.0
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SPECIFICATION
FEATURES:
Power supply: DC 15V/5A (Adaptor)
o Adaptor power supply: AC 100~240V 50/60Hz
Multi TV system: PAL BG /DK /I and SECAM BG /DK /LL’
Multi standard sound processors: NICAM, FM-stereo
Multi Video system: PAL /NTSC /SECAM
Versatile input sources: TV, Video, S-Video, Scart, PC (analog)
Full function remote controller
Excellent sound effect with volume, trable, bass, balance AVC adjustable
Smart sound & picture mode set: Standard, speech, music, soft, rich
Adaptive 2/4 line comb filter for PAL /NTSC
VTR for weak and distoreted signal from video tape recorder
10 pages teletext (option)
CCD, V-Chip (option)
Automatically turn off the set when signal absent longer than 10 minutes.
256 channels
Blue screen display
Model No.: LCT-20KXST
Version: 1.0
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GENERAL SPECIFICATION
PART 1: TV SET
67watt (max) Power consumption
≤3watt (stby)
TV receive system PAL D/K I B/G SECAM B/G DK /LL’
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 specification
Antenna input impedance 75Ω
Audio output power >3W (1KHz, 0.5Vrms, 10%THD)
LED indicator
Hand set power supply Battery 1.5V (AAA) x 2
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)
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 AV In /Out
21 pin Scart in
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
0.7V
2.4-5V (HSYNC & VSYNC)
English /Spanish /Italian OSD language
Russian /German /French
GREEN Power On
RED Power Off
ORENGE Sleep (PC)
p-p
(RGB signal) PC input
p-p
75Ω C:0.7V
p-p
75Ω
p-p
75Ω
p-p
p-p
75Ω
Model No.: LCT-20KXST
Version: 1.0
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PART 2: PC INPUT RESOLUTION
No Resolution V. Freq (Hz) H.Freq (KHz) Band Width
(MHz)
1 720*400 70 31.47 28.322 -/+
2 640*350 70 31.469 25.175 +/-
3 640*480 60 31.47 25.175 -/-
4 640*480 72 37.86 31.5 -/-
5 640*480 75 37.50 31.5 -/-
6 800*600 56 35.156 36 +/+
7 800*600 60 37.88 40 +/+
8 800*600 75 46.88 49.5 +/+
9 800*600 72 48.08 50 +/+
PART 3: PANEL
Brand & model AU /A201SN01
Resolution 800*600
Displayable color 16.7MHz
Surface Hard coating + Anti-Radiation
Viewing Angle (H/V) 160o (Hor) /120o (Ver)
Display Response Time 16ms
Contrast Ratio 1:500
Brightness 450nit
Aspect 4:3
Lamp Life 50,000Hrs
Bad Pixel Quality (Bright /Dark /Total) 2 /3 /5
Polarity H/V
Model No.: LCT-20KXST
Version: 1.0
MAIN BOARD
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Model No.: LCT-20KXST
Version: 1.0
CIRCUIT DIAGRAM
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
PCB BOARD
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
EXPLODED VIEW
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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Model No.: LCT-20KXST
Version: 1.0
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PART LIST
No Part Name Qty
1 Screw, KM 4*8, B 16
2 3001 Rubber 20*4 6
3 Base metal 1
4 Screw, PT 3*12, (white) 6
5 1701 support 2
6 Base aluminous 1
7 Base AL support el (R50*R25) *128.5 1
8 1701 Circuitmgyrate ROD 1
9 1701 Spring washer Φ 6.3/5.3 2
10 1701 Washer Φ 4.3 2
11 Screw BM 4*10, B 2
12 1701 Decorative cover 1
13 Screw BM 3*8, W 2
14 1701 Washer (3) 2
15 1701 Spring washer Φ12.2 (HRC50) 3
16 1701 Washer (2) 2
17 1701 Support metal 1
18 1701 Washer (1) 1
19 1701 Nut (M12) 1
20 SCRRW KM 4*12, C 4
21 1701 Handle 1
22 Screw BM 4*14, W 6
23 Screw KT 3*10, B 2
24 Tuner top cover 1
25 Tuner PCB assembly 1
26 Tuner bottom cover 1
27 Screw KA3L8,B 4
28 Screw BA 3*12, B 6
29 Screw BM 3*6, B 2
30 Rear cover 1
31 Screw BM 3*5, C 1
32 Screw BM 3*5, C 23
33 Screw BM 3*6, C 10
34 Main PCB 1
Model No.: LCT-20KXST
Version: 1.0
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No Part Name Qty
35 Port metal 1
36 Screw BA 3*8, C 16
37 2001 Main PCB support 1
38 Power PCB shielded metal 1
39 Power PCB 1
40 Power PCB Mylar (205*53*0.25mm) 1
41 Power metal 1
42 Screw BT 3*15, C 4
43 Panel 1
44 Screw BT 3*7, C 22
45 Front cover 1
46 Screw BA 3*10, C 5
47 Button PCB 1
48 Button 1
49 Screw BA 3*10,W 16
50 Speaker rear cover 2
51 2001A EVA4 (W) *1 (H) *412mm 2
52 Speaker cover 2
53 Screw BA 3*10, C 12
54 2001B PMMA T=5mm 1
55 Tape/3M Glue 10 (W) *200(L) 2
56 Screw OT 2*6, W 12
57 2001B decorative AL 2
58 Speaker 2
59 2001B PMMA T=3mm
60 Speaker front cover 1
61 Speaker Net 1
62 Cable (11P, 2.0) (2547AWG28#) 1
63 Cable (6P, 2.0) (2547AWG24#) 1
64 Cable (FFC) 1
65 Cable (6P, 2.0) (2468AWG 26#) 1
66 Cable (10P-11P, 2.0) (2468AWG 26#) 1
67 Speaker wire RED/ BLACK, right 1
68 Speaker wire BLUE /BLACK, left 1
68 Rear cover lable 1
70 Port label 1
Model No.: LCT-20KXST
Version: 1.0
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