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LCD-TV
Chassis Model
VN32EO LW32A23W
VN40EO LW40A23W
SERVICE Manual
LCD-TV CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. PCB Layout
11. Schematic Diagrams
Samsung Electronics Co.,Ltd.
This Service Manual is a property of Samsung
416, Maetan-3Dong, Paldal-Gu, Suwon City, Kyungki-Do, Korea,442-742
Electronics Co., Ltd.
Printed in Korea
Any unauthorized use of Manual can be punished
P/N : BN82-00097D-00
under applicable International and/or domestic law.
URL : http://ecms. samsungelectronics. com/
5 Troubleshooting
5-1 No Power
Does proper DC 6V appear at No WAVEFORMS
1 Check sub power PCB.
Pin 1 of power S/W board CN130?
1 DC 6V
Yes
Does proper DC 6V appear at No
1 Check S/W board ass'y.
Pin 3 of input board CN144?
Yes 2 DC 5V
Does proper DC 6V appear at No
1 Check input board.
Pin 3 main board CN505?
Yes
3 DC 3V
Does proper DC 5V appear at No
2 Check IC800 and main power.
Pin 4 main board IC800?
Yes
Does proper DC 3 V appear at No
3 Check IC952, IC955 and IC958.
Pin 3 main board IC801?
Yes
Check IC917, IC902, IC901 and IC900.
LW32A23W/LW40A23W 5-1
5 Troubleshooting
5-2 No Video (CVBS)
The power LED turns green.
Does proper signal appear at No
4 Check cable and input board.
Pin 26 of input board CN136?
Yes
Does proper signal appear at No
4 Check IC700 and related circuit.
Pin 15 of main board IC700?
Yes
6 Does proper clock pulse at Pin 3 of No
5
7 main board IC200 and communicates Check IC200 and related circuit.
with Pin 178 and 179?
WAVEFORMS
4 CVBS Signal 5 IC200,#3 Clock Signal 6 IC200,#178 Communichion Data Signal 7 IC200,#179 Communichion Clock Signal
5-2 LW32A23W/LW40A23W
5 Troubleshooting
Yes
Does proper clock pulse at
9 No
8 Pin 205 of main board IC434 and Check IC400 and related circuit.
10
communicates with Pin 1 and 2?
Yes
Does proper clock pulse at
12 No
11 Pin 31, 27 and 28 of Check IC434 and related circuit.
13
main board IC500?
Yes
Does proper clock pulse at Pin 37, No
14
39 and 40 of main board IC500? Check IC500 and related circuit.
Yes
Replace LCD panel.
WAVEFORMS
8 IC434,#205 Clock Signal 9 IC400,IC434 Communichion Data Signal 10 IC400,IC434 Communichion Clock Signal 11 IC500,#31 Clock Signal
12 IC500,#27 H-Sync 13 IC500,#28 V-Sync 14 IC500,#37,39,40 Clock Output Signal
LW32A23W/LW40A23W 5-3
5 Troubleshooting
5-3 No Video (S-Video)
The power LED turns green.
Does proper signal No
15 appear at Pin 26 and 28 of Check cable and input board.
main board CN505?
Yes
Does proper signal No
15 appear at Pin 18 and 19 of Check IC701 and related circuit.
main board IC701?
Yes
6 Does proper clock pulse at Pin 3 of No
5
7 main board IC200 and communicates Check IC200 and related circuit.
with Pin 178 and 179?
WAVEFORMS
5 IC200,#3 Clock Signal 6 IC200,#178 Communichion Data Signal 7 IC200,#179 Communichion Clock Signal 15 S-Video signal,CN505,#26(Y),28(C),
IC701,#18(Y),19(C)
5-4 LW32A23W/LW40A23W
5 Troubleshooting
Yes
Does proper clock pulse at
9 No
8
10
Pin 205 of main board IC434 and Check IC400 and related circuit.
communicates with Pin 1 and 2?
Yes
Does proper clock pulse at No
12
11
13
Pin 31, 27 and 28 of Check IC434 and related circuit.
main board IC500?
Yes
Does proper clock No
14 pulse at Pin 37, 39 and 40 of Check IC500 and related circuit.
main board IC500?
Yes
Replace LCD panel.
WAVEFORMS
8 IC434,#205 Communichion Clock Signal 9 IC400,IC434 Communichion Data Signal 10 IC400,IC434 Communichion Clock Signal 11 IC500,#31 Clock Signal
12 IC500,#27 H-Sync 13 IC500,#28 V-Sync 14 IC500,#37,39,40 Clock Output Signal
LW32A23W/LW40A23W 5-5
5 Troubleshooting
5-4 No Screen (DVD)
The power LED turns green.
Does proper signal No
17
16
18
appear at Pin 4, 14 and 15 of Check IC102 and related circuit.
main board IC102?
Yes
Does proper signal No
17
16
18
appear at Pin 16, 17 and 18 of Check IC702 and related circuit.
main board IC702?
Yes
Does proper synchronization pulse No
19 21
20 22
at Pin 64 and 66 of main board IC202 and Check IC202 and related circuit.
communicates with Pin 56 and 57?
WAVEFORMS
16 DTV,DVD,Y Signal 17 DTV,DVD,Pb(Cb) Signal 18 DTV,DVD,Pr(Cr) Signal 19 IC202,#66,H-Sync Output Signal
IC101,IC102,#14,IC702,#18 IC101,IC102,#15,IC702,#17 IC101,IC102,#4,IC702,#16
20 IC202,#64,H-Sync Output Signal 21 IC202,#56 Communichion Data Signal 22 IC202,#57 Communichion Clock Signal
5-6 LW32A23W/LW40A23W
5 Troubleshooting
Yes
Does proper synchronization No
23
24
pulse at Pin 30, 31 of Check IC205 and related circuit.
main board IC202?
Yes
Does proper clock No
25 pulse at Pin 71~78, 2~10 of Check IC202 and related circuit.
main board IC202?
Yes
Does proper clock pulse No
6
5
7 at Pin 3 of main board IC200 and Check IC200 and related circuit.
communicates with Pin 178 and 179?
WAVEFORMS
5 IC200,#3 Clock Signal 6 IC200,#178 Communichion Data Signal 7 IC200,#179 Communichion Clock Signal 23 IC202,#30 H-Sync intput Signal
24 IC202,#31 V-Sync Intput Signal 25 IC202,#71~78, 2~10 Data Puls Signal
LW32A23W/LW40A23W 5-7
5 Troubleshooting
Yes
Does proper clock pulse No
9
8
10
at Pin 205 of main board IC434 and Check IC400 and related circuit.
communicates with Pin 1 and 2?
Yes
Does proper clock No
12
11
13
pulse at Pin 31, 27, 28 of Check IC434 and related circuit.
main board IC500?
Yes
Does proper clock No
14 pulse at Pin 37, 39, 40 of Check IC500 and related circuit.
main board IC500?
Yes
Replace LCD panel.
WAVEFORMS
8 IC434,#205 Communichion Clock Signal 9 IC400,IC434 Communichion Data Signal 10 IC400,IC434 Communichion Clock Signal 11 IC500,#31 Clock Signal
12 IC500,#27 H-Sync 13 IC500,#28 V-Sync 14 IC500,#37,39,40 Clock Output Signal
5-8 LW32A23W/LW40A23W
5 Troubleshooting
5-5 No Screen (D-TV)
The power LED turns green.
Does proper signal No
17
16
18 appear at Pin 4, 14 and 15 of Check cable and input board.
main board CN101?
Yes
Does proper signal No
17
16
18
appear at Pin 16, 17 and 18 of Check IC702 and related circuit.
main board IC702?
Yes
Does proper synchronization pulse No
19 21
at Pin 64 and 66 of main board IC202 and Check IC202 and related circuit.
20 22
communicates with Pin 56 and 57?
Yes
Does proper synchronization No
23
pulse at Pin 30, 31 of Check IC205 and related circuit.
24
main board IC202?
16 DTV,DVD,Y Signal
IC101,IC102,#14,IC702,#18
WAVEFORMS
17 DTV,DVD,Pb(Cb) Signal 18 DTV,DVD,Pr(Cr) Signal 19 IC202,#66,H-Sync Output Signal 20 IC202,#64,H-Sync Output Signal
IC101,IC102,#15,IC702,#17 IC101,IC102,#4,IC702,#16
21 IC202,#56 Communichion Data Signal 22 IC202,#57 Communichion Clock Signal 23 IC202,#30 H-Sync intput Signal 24 IC202,#31 V-Sync intput Signal
LW32A23W/LW40A23W 5-9
5 Troubleshooting
Yes
Does proper clock No
25 pulse at Pin 71~78, 2~10 of Check IC202 and related circuit.
main board IC202?
Yes
Does proper clock pulse
6 No
5 at Pin 3 of main board IC200 and Check IC200 and related circuit.
7
communicates with Pin 178 and 179?
Yes
Does proper clock No
12
11
13 pulse at Pin 31, 27, 28 of Check IC434 and related circuit.
main board IC500?
Yes
Does proper clock No
14 pulse at Pin 37, 39, 40 of Check IC500 and related circuit.
main board IC500?
Yes
Replace LCD panel.
WAVEFORMS
5 IC200,#3 Clock Signal 6 IC200,#178 Communichion Data Signal 7 IC200,#179 Communichion Clock Signal 11 IC500,#31 Clock Signal
12 IC500,#27 H-Sync 13 IC500,#28 V-Sync 14 IC500,#37,39,40 Clock Output Signal 25 IC202,#71~78, 2~10 Data Puls Signal
5-10 LW32A23W/LW40A23W
5 Troubleshooting
5-6 No Screen [PC signal(Along)]
27
Does proper input signal No WAVEFORMS
26
28
appear at Pin 8, 9, 10, 12 and Check cable and input board.
13 of main board CN507? 9 IC400,IC434 Communichion Data Signal
Yes
Does proper signal appear at No
27
28
Pin 3, 6 (H-sync), 8 and 10 Check IC907 and related circuit.
(V-sync) main board IC907?
10 IC400,IC434 Communichion Clock Signal
Yes
27 Does proper input signal appear No
Check IC903 and related circuit.
28 at Pin 6, 8 of main board IC903?
Yes
14 IC500,#37,39,40 Clock Output Signal
Does proper communicate No
9
pulse appear at Pin R410 and Check IC400 and related circuit.
10
R457 of main board IC400?
Yes
Does proper signal No
14 appear at Pin 37, 39, 40 and 37 Check IC500 and related circuit. 26 CN507 PC RGB Signal #8,9,10
of main board IC500?
28 PC V-Sync Input Signal 27 PC H-Sync Input Signal
LW32A23W/LW40A23W 5-11
5 Troubleshooting
5-7 No Screen [PC signal(Digital)]
Does proper input signal
No WAVEFORMS
29 appear at Pin 18, 19, 21, 22, 24, 25, Check cable and input board.
27 and 28 of main board CN507? 9 IC400,IC434 Communichion Data Signal
Yes
Does proper signal appear at No
27
28
Pin 48 (H-sync) and 47 (V-sync) Check IC300 and related circuit.
main board IC300?
10 IC400,IC434 Communichion Clock Signal
Yes
27 Does proper input signal appear No
Check IC903 and related circuit.
28 at Pin 4, 10 of main board IC903?
Yes
27 PC H-Sync Input Signal
Does proper communicate No
9
10
pulse appear at Pin R410 and Check IC400 and related circuit.
R457 of main board IC400?
Yes
Does proper signal No
appear at Pin 39, 40 and 37 of Check IC500 and related circuit. 28 PC V-Sync Input Signal
main board IC500?
29 PC Digtal Input Signal
#18,19,21,22,24,25,27,28
5-12 LW32A23W/LW40A23W
2 Product Specifications
2-1 Specifications
Description
Item
LW32A23W LW40A23W
LCD Panel TFT-LCD panel, RGB vertical stripe, normally black TFT-LCD panel, RGB vertical stripe, normally black
transmissive, (32 -Inch) viewable, 0.537 mm pixel pitch transmissive, (40-Inch) viewable, 0.681 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 61 kHz Vertical : 56 Hz ~ 75 Hz
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels
Vertical : 768 Pixels
Input Video Signal Analog, 0.7 Vp-p