Daewoo DPP-4272NBS Schematic

Caution

: In this Manual, some parts can be changed for improving. their
performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List)in
Service Information Center.

Service Manual

42" PLASMA PDP TV

CHASSIS :

Model :

S/M NO. : DSP201PEF0

SP-201P

DPP-4272NBS

Contents

I. Parts with the exception of MODULE

1. Safety Precautions 2

2. Product Specification 3
2-1. SPECIFICATION 3
2-2. Available Input Signal 5
2-3. Remote Control Setup Code 6

3. BLOCK DIAGRAM 27

4. Description Of A/V and power 28
4-1. Block Diagram of main IC and TP 28
4-2. Overview 29
4-3. POWER PCB 37
4-4. Interface with PDP module 39

5. SERVICE MODE 40
5-1. Checking initial menu data 40
5-2. Entering SERVICE MODE 41
5-3. Description Of SERVICE MODE Items 43

6. Adjusting Method 46
6-1. WHITE BALANCE Adjusting 46
6-2. POWER PCB Adjusting 47

7. SOFTWARE UPGRADE Method 49

8. Main PCB Trouble Diagnosis 52
8-1. MAIN & SUB PCB Trouble Diagnosis 52
8-2. POWER PCB Trouble Diagnosis 59

9. TROUBLE DIAGNOSIS 60
9-1. Facts You Must Know When Diagnosing And Repairing 60
9-2. Typical Symptoms of PCB problem or bad Connection 60
9-3. Trouble Diagnosis and Repairing Method for Representative Symptoms 61

10. ASSEMBLY LIST 66

11. STRUCTURE OF PDP SET 67

12. EXPLODED VIEW 72

II. Parts of MODULE

1. Confirmation Manual

2. Repair Manual

-1-

-2-

1. Safety Precautions

I. Parts with the exception of MODULE

1. Safety Precautions

(1) When moving or laying down a PDP Set, at least two people must work together. Avoid

any impact towards the PDP Set.

(2) Do not leave a broken PDP Set on for a long time. To prevent any further damages, after

checking the condition of the broken Set, make sure to turn the power (AC) off.

(3) When opening the BACK COVER, you must turn off power (AC) to prevent any electric

shock. When PDP is operating, high voltage and high current inside the Set can cause
electric shocks.

(4) When loosening screws, check the position and type of the screw. Sort out the screws and

store them separately for reassembling. Because screws holding PCBs are working as
electric circuit GROUNDING, make sure to check if any screw is missing when
assembling/reassembling. Do not leave any screws inside the set.

(5) If you open the BACK COVER, you will see a

Panel Gas Exhaust Tube (Picture. 1-1) inside
the bracket. If this part is damaged, the entire
PDP PANEL must be replaced. Therefore,
when working with the set, be careful not to
damage this part.

Picture 1-1. Panel Gas Exhaust Tube

(6) A PDP Set contains different kinds of

connector cables. When connecting or disconnecting cables, check the direction and
position of the cable beforehand.

(7) Connect/disconnect the connectors slowly with care especially FFC (film) cables and FPC

cables. Do not connect or disconnect connectors instantaneously with force, and handle
them carefully for reassembling.

(8) Connectors are designed so that if the number of pins or the direction does not match,

connectors will not fit. When having problem in plugging the connectors, check their kind,
position, and direction.

-3-

2. Product Specification

I T E M S P E C I F I C A T I O N REMARK

1. GENERAL
1-1. MODEL NO DPP-4272NBS
1-2. CHASSIS NO SP-201P
1-3. SCREEN SIZE 42” (16:9)
1-4. COUNTRY Europe

1-5. RESOLUTION 853(H) x 480(V)
1-6. REMOCON TYPE R-52M17
1-7. SAFETY STANDARD CE(CLASS B), CB
1-8 .TUNIG METHOD FS
1-9. MEMORY CHANNEL 99CH

2. MECHANICAL

2-1. APPEARANCE

1) WITHOUT STAND W x H x D =1044 x 631 x 89 mm

2) WITH STAND W x H x D =1044 x 705.9 x 310 mm

2-2. WEIGHT

1) WITHOUT STAND 30.2 Kg

2) WITH STAND 37 Kg

3. ELECTRICAL

3-1. VIDEO INPUT COMPOSITE(NTSC, PAL, SECAM, PAL-M/N, NTSC4.43) &

S-VHS(50/60Hz Y/C) 1 set

3-2. DTV/DVD INPUT 1080 i, 720P, 480P , 480i, 576P, 576i

(Y, Pb/Cb, Pr/Cr COMPONENT SIGNAL) 2sets
3-3. SCART INPUT SCART(COMPOSITE, R,G,B, SOUND) R/L 2sets
3-4. PC INPUT VGA ~ SXGA(Dot clock : 120MHz), 15 PIN D-SUB 1set
3-5. DVI INPUT DVI-D INPUT (DVI Jack) 1set
3-6. TV INPUT

1) COLOR STANDARD PAL B/G+I/I+D/K, L-SECAM, L’--SECAM

2) ANTENNA IN ONE INPUT 75

Unbalanced (DIN Standard)

3) RECEPTION CHANNEL
VHF LOW : E2 ~ S6 Ch.
VHF HIGH : S7 ~ S36 Ch.
UHF : S37 ~ E69 Ch.
L’-SECOM : FB, FC1, FC

4)

IF & SUBCARRIER

PIF : 38.90MHz (PAL B/G+I/I+D/K, L-SECAM

33.9 MHz (L’-SECAM)
SIF : 33.40MHz (B/G), 32.90MHz (I/I),

32.4MHz (D/K, L-SECAM), 40.4MHz (L’--SECAM)

3-7. SOUND INPUT VIDEO 1set, DTV/DVD 2set, PC 1set, DVI 1set
3-8. SPEAKER OUTPUT 10W(R) + 10W(L)
3-9. POWER REQUIREMENT AC 100V~240V, 50/60Hz

2-1. SPECIFICATION

-4-

Product Specification

I T E M S P E C I F I C A T I O N REMARK
3-10. POWER CONSUMPTION 260W(Typical)
3-11. RS-232 CONTROL RS-232 Communication (FOR SERVICE UPGRADE)
3-12. AV OUTPUT SCART(CVBS, SOUND R/L) 2 sets

3-11. AV OUTPUT CVBS 1 set, SOUND R/L 1 set

3-13. FUNCTION

1) SCALING DVI : H/V SIZE
PC: H/V SIZE, POSITION, PHASE, FREQUENCY
VIDEO/DVD(480i/576i) : 16:9, 4:3, AUTO, EnlargeLB,
EnlargeLBS, PANORAMA
DTV/DVD(480P and Better Reolusion) : 16:9, 4:3

2) ZOOM 20 STEP ZOOM and PANING

3) OSD Language

18 Languages (English, Greek, Dutch, German, Russian, Rumanian,
Swedish, Danish, Finnish, Norwegian, Spanish, Italian, French,
Polish, Portuguese, Czech, Hungarian , Slovakian)

4) OTHERS STILL, SLEEP MODE, SOUND MODE, PICTURE MODE
TIMER, TELETEXT (LEVEL 2.5)

4. OPTICAL
4-1. SCREEN SIZE 42”(106 cm) DIAGONAL
4-2. ASPECT RATIO 16 : 9
4-3. NUMBER OF PIXELS 853(H)X480(V)
4-4. DISPLAY COLOR 1,677 Million Colors ( 8bits for each RGB)
4-5. CELL PITCH 1.08(H) x 1.08(V)mm (1 Pixel = a Set of RGB Cells )
4-6. PEAK LUMINANCE 400cd/m

2

(WITH FILTER GLASS)
4-7. CONTRAST RATIO 1500:1 (Dark Room)
4-8. VIEWING ANGLE 160 degree(VERTICAL/HORIZONTAL)

5. USERCONTROL & ACCESSORIES
5-1 CONTROL BUTTON(SET) PUSH-PULL S/W : AC POWER BUTTON

SOFT S/W: MOVE/CH(UP, DOWN), VOLUME(LEFT, RIGHT),
MENU, INPUT SELECT

5-2. REMOTE CONTROL

(R-52M17) Power, Universal Selection (TV, VIDEO/DVD, CATV/SAT),

10 KEYS(0~10), Recall, VCR /DVD KEY
(F.R/SLOW, Play, F.F/SLOW, Stop, PAUSE, OPEN/CLOSE,
PREV, NEXT ), Menu, TV/VIDEO, MULTIMEDIA, Still,
Previous PR, Sound Off, PR(UP/DOWN), Volume(UP/DOWN),
P.MODE, S.MODE, - , Screen Size, Zoom-, Zoom+, Sleep Timer,
Multilingual/CYAN, Sound Mode/INDEX,. RED, GREEN, YELLOW,
TEXT, REVEAL, UPDATE, EXPAND, SUBPAGE, HOLD

5-3. ACCESSORIES

REMOCON, BATTERY, USERS MANUAL, A/V CABLE, RF CABLE

5-4. OPTIONAL PARTS STAND, WALL HANGER, SPEAKER UNITS(Left, Right)

-5-

Product Specification

Resolution H Freq. (KHz) V Freq. (Hz) Remark DVI PC

640x400 37.861 85.080 VESA O
640x480 31.469 59.940 DOS O O

37.861 72.809 VESA O O

37.500 75.000 VESA O O

43.269 85.061 VESA O O

720x400 31.469 70.087 IBM O O

37.927 85.039 VESA O

800x600 35.156 56.250 VESA O O

37.879 60.317 VESA O O

48.077 72.188 VESA O O

46.875 75.000 VESA O O

53.674 85.061 VESA O O

1024x768 48.363 60.004 VESA O O

56.476 70.069 HP&VESA O O

60.023 75.029 VESA O O

68.677 84.997 VESA O
1152x864 67.500 75.000 VESA O O
1280x960 60.000 60.000 VESA O O

2-2. Available Input Signal

(1) PC & DVI

(2) DTV

-1080i/ 60 Hz

-720P / 60 Hz

-480P / 60 Hz

(3) VIDEO

-PAL, PAL-M, PAL-N

-NTSC , NTSC4.43

- SECAM

-6-

Product Specification

2-3. Remote Control Setup Code

-7-

Product Specification

VCR

VCRVCR

VCR

Mak er (BRAND) NAME CODE NUMB ER ( 3D IGIT) L IST
CANON 147
CAPEHART 061
CARENA 065
CARREFOUR 009
CASIO 039 148
CATHAY 021
CATRON

061 171
CGE 039 044 090 133 148 155
CIHAN CLARIVOX 1 55
CIMLINE

029
CLATRONIC

029 061 171
COMBITECH

033
CONDOR 021 061 155 171
CONTI NEN TA L ED ISO N 044 090
CORVUS 148
CRAIG 008 056
CROSLEY 160
CROWN 009 021 029 061 064 171
CROWN/ONWA 148
CURTISMATHES 060
CYRUS 175
DAEWOO 001 009 021 033 061 064 155 171
DANSAI 021 029 055
DAWA 155
DAYTRON 021 061
DE GRAAF 113 177
DECCA 039 044 047 065 090 148 155 166 175
DECCA(UK) 054
DEGRAAF 015 039 049 054 065 113 148
DEITRON 021
DENKO 029
DENON 113
DESMET 155
DIAMANT 055
DIXI 078
DOMOH 155
DORIC 160
DUAL 021 039 044 065 090 112 148 155
DUMONT 015 039 054 065 148 155 175 189
DYNATECH 039 148
ELBE 021 036 148
ELCATECH 029
ELIN 056 113 155
ELSAY 029
ELTA 021 029 148
EMERSON 009 011 029 032 039 060 073 127 148 155
ESC

021 056 057 061 064
ESSELTE 148
ETZUKO

029
EUROMAN 155
EUROPHON 061
FENNER 061 155
FERGUSON 016 021 023 039 044 090 094 100 104 108

112

130 131 165
FIDELITY 029 039 056 148 162
FINLANDIA 015 039 049 054 065 113 175

-8-

Product Specification

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Product Specification

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Product Specification

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Product Specification

Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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Product Specification

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-27-

3. BLOCK DIAGRAM

-28-

4. Description of A/V(MAIN and SUB PCB) and POWER

4-1. Block Diagram of main IC and TP

IC112

IC149

IC140

IC114

IC102

IC134

IC121

IC132

IC104

IC904

IC903

IC901

PC901

TUNER

LED

KEY

PC101

PC102

PC102

PC900

JA109

JP117

PA102

P100

TO PWR

TO PWR

TO PDP
MODULE

PC103

TP116
TP117

TP130

TP128

TP204 TP205

TP187
TP184
TP181
TP188

TP261

TP136

TP135

TP134

TP143

TP145

TP_AUDIO

Top
Bottom

IC126

IC156

JP118

JA110

-29-

Description of A/V(MAIN and SUB PCB) and POWER

4-2. Overview

A/V block (Main and Sub PCB) is Multi Media circuit board that can process various input signals
such as video, component, PC, DVI, and analog TV signal. It is mainly composed of switching,
sync processing, decoding, analog TV, digital image processing, and system control part

4-2-1. Composite video, Y/C(S-Video) and SCART (CVBS, RGB) composite video

Y/C(S-Video) and SCART(CVBS) have similar signal paths, IC102 receives these signals
and swithes out a selected signal. Then the signal goes into IC132 for video processing,
SCART(RGB) signal goes directly into IC132. The output of IC132 goes through IC134 and
IC140 for deinterlacing and digital image processing respectively.

- Main IC
A. IC102: Switching IC (Input: analog inputs Output: an analog output)
B. IC126: Teletext IC
C. IC132: Video processor (Input: Y/C, CVBS Output: 16bit digital, HV)
D. IC134: Deinterlacer (Input: 16bit digital, HV Output: 24bit digital RGB, HV)
E. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)

- Main TP (Input: Color Bar Pattern)

TP145: Brightness signal (input to IC132)

TP143: Color signal (input to IC132)

-30-

Description of A/V(MAIN and SUB PCB) and POWER

TP184: Horizontal sync (output of IC140)

TP187: Vertical sync (output of IC140)

TP181: Data enable (output of IC140)

-31-

Description of A/V(MAIN and SUB PCB) and POWER

4-2-2. TV signal
Tuner(PC901) receives antenna signal and outputs CVBS and sound signal. IC102 switches out the
CVBS and the rest of the signal flow is same as composite video signal flow mentioned earlier.

- Main IC
A. PC901: Tuner (Input: antenna signal Output: CVBS)
B. IC102: Switching IC (Input: CVBS Output: CVBS)
C. IC126: Teletext IC
D. IC132: Video processor (Input: Y/C Output: 16bit digital, HV)
E. IC134: Deinterlacer (Input: 16bit digital, HV Output: 24bit digital RGB, HV)
F. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)

- Main TP (Input: Color Bar Pattern)

TP143, 145
TP181, 184, 187, 188

4-2-3. DTV/DVD signal

Both DTV(Y, Pb, Pr) and DVD(Y, Cb, Cr) share same jack and signal path. IC102 switches out
signal and also detects type of signal so that IC121 can convert the analog signal to digital. Then
the signal goes through IC134(deinterlacer) and IC140 for digital image processing.

- Main IC
A. IC102: Switching IC (Input: Component Output: Component, HV)
B. IC121: A/D converter (Input: Component, HV Output: 24bit digital RGB, HV)
C. IC134: Deinterlacer (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)
D. IC140: Image Processor (Input: 24bit digital RGB, HV Output: 24bit digital RGB, HV)

TP188: Clock for display (output of IC140)

-32-

Description of A/V(MAIN and SUB PCB) and POWER

- Main TP (Input: 480P, Color Bar Pattern)
TP261: Y signal (Input to IC121)

TP134: Clock (output to IC121)

TP135: Horizontal sync (output of IC121)

-33-

Description of A/V(MAIN and SUB PCB) and POWER

4-2-4. PC (Personal Computer)signal

PC signal is switched out by IC109 and input to IC114 for A/D conversion. Then the signal goes
through IC140 for digital image processing.

- Main IC
A. IC109: Switching IC (Input: Analog RGB, H, V Output: Analog RGB, H, V)
B. IC114: A/D converter (Input: Analog RGB, H, V Output: 24bit digital RGB, H, V)
C. IC140: Image Processor (Input: 24bit digital RGB, H, V Output: 24bit digital RGB, H, V)

- Main TP (Input: Color Bar Pattern)

TP130: Vertical sync (output of IC114)

TP136: Vertical sync (output of IC121)

-34-

Description of A/V(MAIN and SUB PCB) and POWER

TP128: SYNC for PLL (output of IC114)

TP127: Output clock (output of IC114)

4-2-5. DVI(Digital Visual Interface) signal

To process DVI signal, graphic card of AV device reads EDID data from IC101(ROM). Then DVI
signal is directly inputted to IC112, which outputs digital 24bit RGB and H, V. The output goes
through IC140 for digital image processing.

- Main IC
A. IC101: ROM containing EDID data (EDID: display capabilities such as resolution, aspect ratio

etc.)

B. IC112: DVI signal processor (Input: TMDS Output: 24bit digital RGB, H, V)

-35-

Description of A/V(MAIN and SUB PCB) and POWER

- Main TP (Input: Color Bar Pattern)
TP116: Horizontal sync (output of IC112)

TP117: Vertical sync (output of IC112)

4-2-6. Video Enhancer and LVDS transmitter (for all inputs)

Outputs of IC140 are inputted to IC149(video signal enhancer) which improves picture quality greatly.
Outputs of IC149 are inputted to IC150 which is a LVDS transmitter. The converted LVDS signal is
transmitted to the digital board.

- Main IC

A. IC149: Video enhancer (Input: 24bit digital RGB, H, V Output: 24bit digital RGB, H, V)
B. IC150: LVDS transmitter (Input: 24bit digital RGB, H, V Output: LVDS signal)

- Main TP (Input: Color Bar Pattern)

TP204: Horizontal sync (output of IC149), refer to TP184
TP205: Vertical sync (output of IC149), refer to TP187

-36-

Description of A/V(MAIN and SUB PCB) and POWER

4-2-7. Audio signal processing, KEY, and LED

IC104 switches Audio signals and passes a switched signal to IC904 for audio signal processing.
IC904 controls sound parameters such as Volume, Balance, and Equalize. The outputs of IC904 are
passed to IC901(left), and IC903(right) respectively to amplify the signals. KEY and LED PCBs send
signals received from key buttons and LED to IC140 for command processing.

- Main IC
A. IC104
B. IC904
C. IC901, IC903

- Main TP (Input: Sound wave 400Hz)

TP_AUDIO: AUDIO SIGNAL that goes into MSP3420 before AUDIO PROCESSING

RIGHT (LEFT) : AMP input signal before 30dB amplification

-37-

Description of A/V(MAIN and SUB PCB) and POWER

Remote control signal

4-3. POWER PCB

<Input requirements>

Nominal Input Voltage: AC100V to AC240V (Variation Range- AC85V~ AC276V)
Single-Phase full wave
Regulation Method: Transistor & Switching Method
Input Frequency: 50~60Hz (Variable Range- 45Hz ~ 66Hz)
Inrush Current: 50A zero-peak max at AC264V
Output Voltage is as follows.

No. Output Nominal Variable Voltage Nominal Load current Ripple/Noise

Name Voltage Range Accuracy current range (mVp-p)*2

(V) (V) (%)*1 (A) (A)

1 Vsus 190 180-195 5V 1.3 0.1~1.3 1000/500
2 Vadd 60 50-80 2V 1 0.1~1 250/500
3 V1 5.1 - 5% 2.5 0.1~3 50/100
4V3 17 - 5% 1 0~1 50/100

(SOUND) -17 - 5% 1 0~1 50/100
5V4 50 - 5% 1.5 0.1~1.5 50/100
6V5 12 - 5% 0.6 0~1 50/100
7 Vstb 5 -

5% 1.5 0~1.5 100/100

-38-

Connector number P4 P5 P7

Model name YMW025-10R YMW025-05R YMW025-04R

Maker YEONHO YEONHO YEONHO

The number of pins 10 5 4

1 NC POWER(ON/OFF) V3 - 17V
2NCNCG
3 V5 12V NC G
4 G G V3 17V
5 G Vstb
6 V4 5V
7G
8G
9NC

10 NC

Pin

number

* P2 is connected to P5 of Y-SUB PCB.

P3 is connected to P1 of Z-SUS PCB.
P6 is connected to P6 of Y-SUS PCB.
P4 is connected to PA4 of VIDEO PCB.
P5 is connected to PA5 of VIDEO PCB.
P7 is connected to PA6 of JACK PCB.

Description of A/V(MAIN and SUB PCB) and POWER

Connector number P2 P3 P6

Model name GP390-10P-TS 1-1123723-8 GP390-04P-TS

Maker LG Cabel AMP LG Cable

The number of pins 10 8 4

1 Vsus 190V Vsus 190V G
2 Vsus 190V Vsus 190V G
3 Vsus 190V NC V1 5.1V
4 NC G V1 5.1V
5GG
6 G Vadd 60V
7GG
8 G V1 5.1V
9NC

10 NC

Connector

Pin

number

-39-

Description of A/V(MAIN and SUB PCB) and POWER

4-4. Interface with PDP Module

< PDP Module >

A/V

POWER

-40-

5. SERVICE MODE

5.1 Checking initial menu data
(1) Check initial data of User Menu

1) Picture

- Mode : Normal
BRIGHTNESS : 32

CONTRAST : 48
COLOR : 32
Tint : 32 (CENTER) * Not displayed when input signal is PAL or SECAM
Sharpness : 32

- Colour Temp. : Normal

2) Sound

- Balance : 0 (CENTER)

- Effect : Off

- AVC : Off

- Mode : Normal
120 Hz : 0 (CENTER)

500 Hz : 0 (CENTER)

1.5 KHz : 0 (CENTER)
5 KHz : 0 (CENTER)
10 KHz : 0 (CENTER)

3) Screen Mode : 16:9

4) Features

- Background : Opaque

- Language : English

- Child Lock : Off

- Enhancer : On

- Auto Power : Off

- Time Setting

Clock : — —:—
Off Timer : Off
Off Time : AM 12:00
Wake Timer : Off
Wake Time : AM 12:00
Wake Pro. : 1
Wake Vol. : 20

- ISM
Pixel Shift : Off

Low Bright : Off

- Initialize

-41-

SERVICE MODE

5) Install(TV input only)

- Auto Setup

- Edit

- Manual Setup

5-2 Entering SERVICE MODE

To enter SERVICE MODE

Press “ VOL” => “MUTE” => “RECALL” => “MUTE” BUTTON of Remote Controller

(1) Check initial data of Service mode

1) PW 181-1
[Note] Initial data of Service Mode can be different depending on Micom(firmware) version.

The actual data applied to each set is equal to the data of when executing “Servide
Mode->Reset->Level 1”

- Sub Brt : 24

- Sub Cont : 12

- Bias R : 32

- Bias G : 30

- Bias B : 30

- Gain R : 20

- Gain G : 20

- Gain B : 12

2) PW 181-2

- DVI Brt : 16

- DVI Cont : 0

- Sharp Filter : Normal

3) VPC 3230

- Comm Brt : 139

- Comm Cont : 44

- Comm Peak : 3

- CVBS Color : 112

- CVBS Tint : 128

- Comp Brt : 196

- Comp Cont : 28

- Comp Cb : 23

- Comp Cr : 29

- Comp Tint : 32

4) 9883_G

- Bias R : 64

- Bias G : 64

- Bias B : 64

- Gain R : 128

- Gain G : 128

- Gain B : 128

5) 9883_V

- Bias Cr : 64

-42-

SERVICE MODE

- Bias Y : 60

- Bias Cb : 64

- Gain Cr : 128

- Gain Y : 128

- Gain Cb : 128

6) MDIN 150

- Bright : 128

- Contrast : 64

- Color : 64

- NR : Off

7) Enhncr

- B&W : ON

- FCT : ON

- ACR : ON

- Gamma : ON

- Dither : ON

- SEISAI : ON

8) MSP 34xx

- Sc pScale : 21

- FM pScale : 25

- NC pScale : 51

9) M2

- Contrast :1

- H Posi Full : 30

- Language : 0

- Option : 2

- CIK Full C40 : 0

- CIK Full C56 : 0

- Vposi Full : 132

10) Misc

- Tst Ptrn : AT

- Tst Ptrn : MA

- AT Search ON : ON

- TV AT OFF : ON

11) Info (firmware version information)

12) Reset

- Level 1

- Level 2

- Factory

13) Panel (NEC 42” SD)

- 50Hz Mode : STD1

- 60Hz Mode : STD1

- Frame Conv : Off

- Long Life : Off

- Gamma : On

- ED : On

-43-

SERVICE MODE

5-3. Description of SERVICE MODE Items

1) PW181-1 : Image processor control values. Mainly used to adjust White balance.

[Note] These values need to be adjusted only after replacing MAIN PCB. These values
may vary from set to set. Therefore if these values are recorded before replacing MAIN
PCB, you do not need to adjust WHITE BALANCE additionally.

(1) Sub Brt : For BRIGHTNESS adjustment (All inputs)
(2) Sub Cont : For CONTRAST adjustment (All inputs)
(3) Bias R : For R BRIGHTNESS adjustment (All inputs)
(4) Bias G : For G BRIGHTNESS adjustment (All inputs)
(5) Bias B : For B BRIGHTNESS adjustment (All inputs)
(6) Gain R : For R CONTRAST adjustment (All inputs)
(7) Gain G : For G CONTRAST adjustment (All inputs)
(8) Gain B : For B CONTRAST adjustment (All inputs)

2) PW181-2 : Additional PW181 control values

[Note] The following values do not need to be adjusted after replacing MAIN PCB.
Therefore you do not need to change initial values..

(1) DVI Brt : For BRIGHTNESS adjustment (DVI)
(2) DVI Cont : For CONTRAST adjustment (DVI)
(3) Sharp Filter : For SHARPNESS adjustment (Video, S-video)

3) VPC3230 : VIDEO DECODER control values. Used to adjust picture quality of VIDEO/S-

VIDEO inputs.

[Note] The following values do not need to be adjusted after replacing MAIN PCB.
Therefore you do not need to change initial values.

(1) Comm Brt : For BRIGHTNESS adjustment (Video, S-video, Caption)
(2) Comm Cont : For CONTRAST adjustment (Video, S-video, Caption)
(3) Comm Peak : For SHARPNESS adjustment (Video, S-video, Caption)
(4) CVBS Color : For COLOR adjustment (Video, S-video)
(5) CVBS Tint : For TINT adjustment (Video, S-video)
(6) Comp Brt : For BRIGHTNESS adjustment (Caption only)
(7) Comp Cont : For CONTRAST adjustment (Caption only)
(8) Comp Cb : For Color (Cb) adjustment (Caption only)
(9) Comp Cr : For Color (Cr) adjustment (Caption only)
(10) Comp Tint : For TINT adjustment (Caption only)

4) 9883_G : Graphic port A/D converter control values. Used to adjust picture quality of PC

input.

[Note] The following values do not need to be adjusted after replacing MAIN PCB.
Therefore you do not need to change initial values.

-44-

SERVICE MODE

(1) Bias R : For R BRIGHTNESS adjustment (PC)
(2) Bias G : For G BRIGHTNESS adjustment (PC)
(3) Bias B : For B BRIGHTNESS adjustment (PC)
(4) Gain R: For R CONTRAST adjustment (PC)
(5) Gain G: For G CONTRAST adjustment (PC)
(6) Gain B: For B CONTRAST adjustment (PC)

5) 9883_V : Video port A/D converter control values. Used to adjust picture quality of Component
inputs.

[Note] The following values do not need to be adjusted after replacing MAIN PCB. Therefore
you do not need to change initial values.

(1) Bias Cr : For Cr BRIGHTNESS adjustment (Component)
(2) Bias Y : For Y BRIGHTNESS adjustment (Component)
(3) Bias Cb : For Cb BRIGHTNESS adjustment (Component)
(4) Gain Cr : For Cr CONTRAST adjustment (Component)
(5) Gain Y : For Y CONTRAST adjustment (Component)
(6) Gain Cb : For Cb CONTRAST adjustment (Component)

6) MDIN150 : Used to adjust DEINTERLACE performance. Affect component & video input.

[Note] The following values do not need to be adjusted after replacing MAIN PCB. Therefore
you do not need to change initial values.

(1) Bright : For BRIGHTNESS adjustment (Video, S-video, Component)
(2) Contrast : For CONTRAST adjustment (Video, S-video, Component)
(3) Color : For COLOR adjustment (Video, S-video, Component)
(4) NR : Noise Reduction Filter adjustment (Video, S-video, Component)

7) Enhncr : Picture Quality Enhancer. Used to adjust picture quality for all inputs.

[Note] The following values do not need to be adjusted after replacing MAIN PCB. Therefore
you do not need to change initial values.

(1) B&W : Black & White Stretch ( ON: enables B Emph, W Emph, and G Emph)
(2) FCT : Favorite Color Technology
(3) ACR : Accurate Color Reproduction
(4) Gamma : Video Inverse Gamma(=1.47) Correction
(5) Dither : Error Diffusion
(6) SEISAI : Random dither pattern masking

8) MSP34xx : Sound processor

[Note] The following values do not need to be adjusted after replacing MAIN PCB. Therefore
you do not need to change initial values.

(1) Sc pScale : Prescale adjustment for external input(Video, Component, PC, DVI etc.)
(2) FM pScale : FM/AM prescale adjustment
(3) NC pScale : NICAM prescale adjustment

9) M2 : Teletext decoder

(1) Contrast : Text Contrast
(2) H Posi Full : Adjust H position in Full Text
(3) Language

Teletext Language Group Table

0 West Europe(England/France/Sweden/Czech/Germany/Spain/Italy)
1 East Europe(Poland/France/Sweden/Czech/Germany/Slovenia/Italy/Romania)
2 Turkish/Greek(England/France/Sweden/Turkey/Germany/Spain/Italy/Greece)
3 Cyrillic
4 ARAB/HEBREW
5 FARSI ALL

-45-

SERVICE MODE

(4) Option

0 : Top
1 : Flop

2 : Top & Flop
(5) CIK Full C40 : Adjust pixel clock in half text 40 column text
(6) CIK Full C56 : Adjust pixel clock in half text 56 column text
(7) Vposi Full : Adjust V position in Full Text

10) MISC
(1) TST PTRN AT : Cycled patterns from R G B WH every 1 minute automatically.
(2) TST PTRN MA : Cycled patterns from BK WH R G B by pressing volume up key
(3) AT Search ON : Auto program search and sorting.
(4) TV AT OFF : When in TV mode and no signal is detected for 30 min, the set is turned

off automatically.

11) INFOR : MICOM(firmware) version information

(year 4 digits, month 2 digits, date 2 digits and time 4 digits : e.g. 200409221030 )

12) RESET
(1) LEVEL 1: Reset all values (service mode & user menu).
(2) LEVEL 2: Reset all except PW181-1 values
(3) FACTORY: Reset user menu values

13) PANEL
(1) 50Hz Mode :

- STD1 : Standard Mode 1 (Peak Luminance 100%, False Contour Good)

- STD2: Standard Mode 2 (Peak Luminance 100%, False Contour Bad)

- HIQ1: High Image Quality Mode 1 (Peak Luminance 70%, False Contour Very Good)

- HIQ2: High Image Quality Mode 2 (Peak Luminance 70%, False Contour Good)
(2) 60Hz Mode :

- STD1: Standard Mode 1 (Peak Luminance 100%, False Contour Good)

- STD2: Standard Mode 2 (Peak Luminance 100%, False Contour Bad)

- HIQ1: High Image Quality Mode 1 (Peak Luminance 70%, False Contour Very Good)

- HIQ2: High Image Quality Mode 2 (Peak Luminance 70%, False Contour Good)
(3) Frame Conv :

- Off: Input Vsync Frequency = Panel Display Vsyinc Frequency

- On: Panel Display Vsync Frequency Fixed (=60Hz)
(4) Long Life : Safety Mode(Low Peak Luminance)
(5) GAMMA : Panel Inverse Gamma Correction
(6) ED : Panel Error Diffusion

-46-

6. Adjusting Method

Figure 6-1 Step Gray Scale Pattern

2) Check initial data from USER CONTROL (refer to 5-1)

3) In order to start Service mode, press button in following order “ Vol -> Mute -> Recall
(Display) -> Mute” of the remote control. And then select PW181-1 for checking initial data of

the SERVICE MODE (refer to 5-2).

4) Attach the sensor of White Balance Meter (CA-100) to the 80% white level of the screen.

5) Adjust White Balance by controlling R, G, B GAIN.

.

Control R, G, B GAIN values so that the ranges are within DP (Default Value)

10. If the gains

are deviated from the range, the SET is disqualified.

.

Set color coordinate to x=0.270

0.005, y=0.285 0.005, and the Color Temperature to greater

than 10,000

K.

6) Attach the sensor of White Balance Meter to 40% of white level on the screen

7) Adjust White Balance by varying the values of R,G, B BIAS.

.

Control R, G, B BIAS values so that the ranges are within “Default Value”

5. If deviate from

the range, classify the SET disqualified.

.

Set color coordinate to x=0.275

0.005, y=0.290 0.005.

8) Until the coordinte reaches previously set coordinate value depended on the white level, keep
adjusting.

9) To exit the Service mode, press Menu button of the remote control.

6-1. WHITE BALANCE Adjustment

1) Apply 5 Step Gray Scale pattern to Video input terminal (Pattern generator: MIK 7253S)

-47-

2. Vadd (ADDRESS Voltage) : DATA Input Voltage
Measurement equipment : Digital Volt Meter ( DC Volt mode )

Adjusting TP : TP206 (See Picture. 6-2)
Adjusting Location : RV204 (See Fig.4)
Optimum Adjusting Voltage : Voltage which is written in Label which is at upper right side of PDP

Module. (Typical Voltage : 65 V - Fig.3)

Adjusting Method

6-2. POWER ADJUSTMENTS

Video pattern condition: 100 IRE Full White Pattern
Power PCB Adjustment mean that you should set the following 2-type power voltages to the values

which were already adjusted by PDP module (LG Module) maker. Therefore, if there are some
problems in picture after adjusting, you should classify that PDP module as a fault and contact to
PDP module maker.

1. Vsus (SUSTAIN Voltage): Discharge Sustain Voltage
Measurement equipment : Digital Volt Meter ( DC Volt mode )

Adjusting TP : TP204 (See Picture 6-2)
Adjusting Location : RV203(See Fig.4)
Optimum Adjusting Voltage : Voltage which is written in Label which is at upper right side of PDP

Module. (Typical Voltage: 190 V - Fig. 3)

Picture 6-1. Power Connection and Voltage Adjustment Label

Fig. 3Voltage Adjustment Label

-48-

Adjusting Method

Fig. 4 Connection and TP Location

1. High voltage S/W
Do not touch while operating

2. When replacing a power board make sure to check these switches.

.

High voltage S/W -> “HIGH”

Power => Z-sus

(Ysus,Vadd,5V)

Power => Y-sus

(5V)

Power => Video

(5V, 12V)

Power => Video

(STB 5V, PWR_CTL)

AC Power
Input Line

Vsus TP

(TP204)

Vadd TP (TP206)

High Voltage

Switch

VOLUME for adjust ing

Vsus (RV203)

VOLUME for adjust ing

Vadd (RV204)

-49-

7. SOFTWARE UPGRADE Method

1. Check whether MAIN PCB is connected to SUB PCB(JP117 to JA109).

2. Connect 9-PIN serial cable to the serial port of the computer.

3. Connect the opposite end of the serial cable to RS-232C port of SUB PCB.

4. Run Flashupgrader.exe in the PC to excute the program as shown below.

5. Select current Upgrade file

- Click “Choose...” button to select the file you want to upgrade.

- Select the file (pwSDK.inf) that you want to upgrade.

-50-

SOFTWARE UPGRADE Method

6. Select correct COM Port and Baud Rate(115200) as shown below. Then press Flash button to finish
setup.

7. Turn on the ac power and then upgrade program will start the download as shown below.

-51-

SOFTWARE UPGRADE Method

8. When the upgrading is complete, a window (below) will be opened. Press “Finish” button to complete
the process.

-52-

[NOTE] Refer to “PDP MODULE” section for trouble diagnosis other than MAIN, SUB and POWER

PCB.

1. Common checking process when “No signal” or “No raster”
(No signal: OSD is working but no images are displaying, No raster: Not even OSD is displaying)

2. When “No signal” in Video, S-VIDEO, and Component modes.

(1) First check if PC input is working.

If PC is not working replace MAIN PCB.
For detail examination, with an oscilloscope check TP188, TP184 and TP187 signal explained

in A/V block section.
If TP188, TP184 or TP187 signal does not appear, replace MAIN PCB.

(2) Checking waveforms with COLOR BAR pattern(for detail examination only)

8. Main PCB Trouble Diagnosis

Does "No si gnal " screen

appear ?

Is the signal input Jack

properly connected?

Does input source (AV

device) work ?

Is a weak

discharge detected

in the screen?

1.Check AC connection

2. Check Power S/W ON

3. Check other PCBs

N

N

N

Check the connection of

Jack(PDP and AV device)

Is LVDS connecti on

correctly connected?

Check LVDS connection

Is waveform of DVS,DHS,

DCLK in the Main PCB normal?

1. Check other PCBs and connectors

Check AV device

Check input

mode

Check start

N

N

N

N

N

Y

Y

Y

Y

Y

Y

Y

Is input selection in the

Correct mode ?

Y

Replace Main PCB

and/or Sub PCB

CN101 of Digital PCB &

P100 of Main PCB

Replace Main PCB

and/or Sub PCB

TP(187,184,181)

(Refer to PDP Module section)

8-1. MAIN & SUB PCB Trouble Diagnosis

-53-

Main PCB Trouble Diagnosis

When Y Cb Cr input : TP261 located in the center of the PCB near IC121.

COMPOSITE Input : Check Positive polarity of CE203 located near IC132.

S- VHS input : Check Negative polarity of CE284 located near IC159.

If above signals do not appear, MAIN PCB needs to be replaced.

(3) With Video or S-Video inputs

Check TP138(V sync), TP139(H sync)

If signals do not appear, replace MAIN PCB.

-54-

Main PCB Trouble Diagnosis

If above signals do not appear, replace MAIN PCB.

4. When PC signal do not appear on screen
(1) Input DTV or VIDEO signal and see if DTV or VIDEO images are displaying.

If “No signal”, check TP188, 184 and 187.
If TP188, 184 and 187 signal do not appear, replace MAIN PCB.

(2) Check TP124 (V SYNC), TP125 (H SYNC) (when 800 X 600).

(4) With Component inputs

Check TP136(V sync), TP135(H sync)

If signals do not appear, replace MAIN PCB.

3. When DTV (1080i, 720P, 480P) signal do not appear on screen
(1) Input PC or VIDEO signal and see if PC or VIDEO images are displaying.

If “no signal”, check TP188, 187 and 184.
If DCLKB, DHS and DVS signal do not appear, replace MAIN PCB.

(2) Check TP136(V sync), TP135(H sync) <when 1080i >

-55-

Main PCB Trouble Diagnosis

If above signal do not appear, replace MAIN PCB.

-56-

Main PCB Trouble Diagnosis

5. When No Sound

Do images display on

screen?

N

IC 904's problem.

Replace SUB PCB.

Check start

N

N

N

N

Y

Y

Y

Y

IC901 or IC903 Problems.

Replace SUB PCB.

N

Y

Y

Y

Is the Sound input Jack

properly connected?

Is the Speaker connection

correctly connected?

With a Video input(video&sound) Outputs

of 4th and 19th of JA109 ok?

Check 11th pin of IC901 & 903?

Is the sound output of JP901 in JACK

PCB normal?

Problem of SPEAKER or SOUND CABLE.
So, replace SPEAKER or SOUND CABLE

1. Check AC connection

2. Check Power S/W ON

3. Check MAIN or other PCBs

Check the connection of

Jack(PDP and AV device)

Check the connection of

Speaker

1. Check connection between
MAIN and SUB PCB

2. Or IC104's problem.
Replace MAIN PCB.

-57-

Main PCB Trouble Diagnosis

Is 5th pin from the top of PC102 output normal?

1. Check AC connection

2. Check Power S/W ON

3. Check other PCBs

1. Replace the CONNCETOR.

2. Replace Key PCB.

Check the connection of KEY
PCB toMAIN PCB

Check MAIN PCB

Check start

N

N

N

Y

Y

Does LED turn on (green light)?

Y

Y

Does LED next to Power S/W
turn on (red light)?

6. When Key does not operate

-58-

Main PCB Trouble Diagnosis

N

Check the connection of LED PCB
to MAIN PCB

Check start

N

N

N

Y

Y

Y

Replace LED PCB.

Y

Y

Does LED next to Power S/W
turn on (red light)?

Is Remote Controller
working?

Does Set turn on by
pressing a key button?

Using an oscilloscope

check TP113 near PC101.

Does it output a signal whenever a remote

controller button is pressed?

1. Check AC connection

2. Check Power S/W ON

3. Check other BLOCKs

Check the Battery of
Remote Controller

1. IR Receiving BLOCK of MAIN PCB is not
working.

2. Replace MAIN PCB

7. When Remote Controller does not operate

-59-

Main PCB Trouble Diagnosis

8-2. POWER PCB Trouble Diagnosis

After checking High Voltage Board / Scan Relay Board / Data Relay Board (refer to II. PDP
MODULE), and the set still does not operate, then check if the following Power PCB’s Trouble
Symptoms appear.

After unplugging Power Connectors of Power PCB (P3 and P6) and checking remaining
voltage, there still exist several tens of remaining voltage.

When output condition of Power PCB is set to low-voltage, output voltage table lists 3~7 are
NOT normal. Or when set to high-voltage, output voltage table list 1~2 are NOT normal. (Refer

to 4-3)

When output condition of Power PCB is set to low-voltage, output voltage table lists 3~7 are
normal. But when set to high-voltage, output voltage table list 1~2 are NOT normal. (Refer to

4-3)

After turning on the PDP set with Remote Controller when output condition of Power Module is
set to high-voltage, the LED turn “Green” but the “Power Shut Down” happens after 2~3

seconds.

If high voltage (Vsus, Vadd) measured from Power PCB is different from that of optimum
adjusting voltage label, re-adjust the voltages referring to “I. 6-2. POWER Adjustments”

-60-

9. TROUBLE DIAGNOSIS

[NOTE] Refer to “PDP MODULE” section for module diagnosis.

* Refer to Chapter II for Symptoms of other parts with exception of MAIN, SUB PCB and POWER

PCB Trouble.

9-1. Facts you must know when trouble diagnosing or repairing

(1) Trouble diagnosing and repairing of set mean find out which PCBs or blocks are not working and

replace them with new PCBs. Repairing the broken PCBs are not necessary. Keep the broken
PCBs and return them to service center or R&D center.

(2) This TROUBLE DIAGNOSIS list only contains representative and simple PCB trouble diagnosis

and Module Exchange method. Therefore, if you find Sets that are difficult to diagnose or to
repair, contact R&D center.

(3) Basic TROUBLE DIAGNOSIS procedure

Check problem Symptoms -> Open BACK COVER -> Trouble Diagnosis e Replace broken PCB

-> Adjust new PCB module -> HEATRUN (for at least 30 minutes, input TEST PATTERN FULL
WHITE), full FUNCTION test -> Repair Complete.

(4) Required equipments for trouble diagnosis

- DIGITAL MULTIMETER (User Mode : measure DC VOLTAGE, measure DIODE VOLTAGE,
SHORT-OPEN TEST )

- Screwdriver (or electric screwdriver), plastic adjusting tool

- Oscilloscope (for detailed examination only)

(5) Each BLOCK operations explained in this manual include OSCILLOSCOPE waveforms, but these

are for reference only and utilizing them to repair PCBs is not necessary.

(6) Before replacing PCBs, you MUST turn the AC Switch “OFF”.

(7) After replacing High Voltage Board, POWER, and MAIN & SUB PCB, extra adjustment might be

needed. (Refer to I. 6. Adjusting Method)

(8) After the set is repaired, leave BACK COVER open for followings. Run HEATRUN for at least

30 minutes by displaying TEST PATTERN (FULL WHITE) of SERVICE MODE (Refer to
Service Manual I.5. Service Mode). Check the screen conditions and basic functions (remote
control operation etc.).

(9) After BACK COVER is closed, redo HEATRUN for at least one hour with FULL WHITE input

using TEST PATTERN of SERVICE MODE. Check the screen conditions and basic functions.

9-2. Typical Symptoms of PCB problem or bad Connection

(1) Symptoms of POWER PCB Trouble

<Symptom.1> Not even a weak discharge detected on the screen.
<Symptom.2> Discharge on the screen is unstable
<Symptom.3> Set is making unusual noise
<Symptom.4> POWER SHUT DOWN occur (refer to Service Manual I. 9-3)

-61-

TROUBLE DIAGNOSIS

(2) Symptoms of MAIN or SUB PCB Trouble

<Symptom.1> Only a weak discharge shows on the screen, but it is displaying No images.
<Symptom.2> Images are abnormal
<Symptom.3> Particular input signal (Video, PC or Component etc.) does not work.
<Symptom.4> No SOUND
<Symptom.5> Occasionally, set does not operate normally. Turning off and on the AC power make

the set to operate normal again.
<Symptom.6> Remote Control or KEY does not work.
<Symptom.7> POWER SHUT DOWN occur (refer to Service Manual I. 9-3 )

(3) Representative Symptoms caused by bad Connection between PCBs.

[Note] Dust or extraneous materials may cause bad connections. Most of the time, applying soft

brush, AIR FRESHER, or breath to clean dust or extraneous materials can solve it. And
then reassemble the Connector.

9-3. Trouble Diagnosis and Repairing Method for Representative Symptoms

(1) When POWER SHUT DOWN occurs

<1> Definition of “SHUT DOWN”

- While LED color is green, POWER PCB does not make any operating noise. (Red: STAND
BY, Green: Operating)

- When the set is turned on power relay does not operate normally, and POWER PCB does not
make any operating noise.

<2> Trouble Repairing Procedure

- As shown in Fig. 5, first check whether “LOW VOLTAGE” part or “HIGH VOLTAGE” part has
problems.

- If “LOW VOLTAGE” part’s problem is detected, diagnose and repair the SET as shown in Fig. 6.

- If “HIGH VOLTAGE”part’s problem is detected, diagnose and repair the SET as shown in Fig. 6.

- <Caution1> When disconnecting/connecting connectors, you MUST turn “OFF” the AC power

and check the direction and position of the connectors before working.

- <Caution2> Whenever you reassemble connectors connecting High Voltage Board and

POWER PCB(CN805, CN806), remaining voltage still exists in the POWER PCB
could cause electric shock and damage the set. Therefore always reassemble the
connectors several minutes after AC power is off. To be more careful, using a
MULTIMETER you should check to see if Vsus is less than 10V and then connect
connectors.

-62-

TROUBLE DIAGNOSIS

(2) When weak Discharge exists on screen but “OSD screen” can not be seen

<1> Definition of this symptom

- When the set is turned on, screen is BLACK but Weak Discharge (luminescence) exists.

- OSD does not show on screen and the set does not respond to remote controller or KEY panel
buttons.

<2> PCB CHECK PRIORITY

- MAIN PCB, SUS PCB

<3> Repairing Procedure

- Check LVDS cable (MAIN PCB to DIGITAL PCB) first and then other connectors connecting
MAIN PCB. If this does not fix the problem replace MAIN PCB.

-63-

TROUBLE DIAGNOSIS

Fig. 5 Trouble Diagnosis Flow when “SHUT DOWN” occurs

Turn ON the SET

NOYES

Turn AC power OFF

Open BACK COVER

Set POWER PCB'S VOLTAGE SWITCH

to LOW (refer to Fig. 4)

Turn AC power ON (STAND BY)

Disconnect P3, P4, P5, P6

of POWER PCB

"SHUT DOWN"

occur?

* LOW VOLTAGE part is problem.

* Related PCBs
DIGITAL, MAIN, SUB

* HIGH VOLTAGE part is problem.

* Related PCBs
High Voltage, SCAN, DATA

-64-

TROUBLE DIAGNOSIS

Fig. 6 Trouble Diagnosis Flow when LOW VOLTAGE “SHUT DOWN” occurs

YES

YES

NO

NO

YES

NO

Unplug Connectors connecting High
Voltage and POWER PCB(CN806)

AC PWR "ON" =>
PWR "ON" with Remote Controller

"SHUT DOWN"

occur?

AC PWR "OFF" =>

AC PWR "ON" =>
PWR "ON" with Remote Controller

AC PWR "ON" =>
PWR "ON" with Remote Controller

Unplug Connectors connecting High
Voltage and DIGITAL PCB(CN601)
Unplug Connectors connecting High
Voltage and DATA PCB(CN7)

AC PWR "OFF"

"SHUT DOWN"

occur?

Replace High

Voltage Or

SCAN PCB

"SHUT DOWN"

occur?

Replace DIGITAL

Or DATA PCB

Replace MAIN

PCB

Replace SUB

PCB

Unplug Connectors connecting SUB
and POWER PCB(P4 and P5)
Unplug Connectors connecting High
Voltage and POWER PCB(P6)
Unplug Connectors connecting SUB
and MAIN PCB(JP117)

Turn AC PWR OFF

Set VOLTAGE SWITCH of POWER

PCB to LOW (Fig. 4)

-65-

TROUBLE DIAGNOSIS

Fig. 7 Trouble Diagnosis Flow when HIGH VOLTAGE “SHUT DOWN” occurs

YES

YES

NO

NO

AC PWR "OFF"

AC PWR "ON" =>
PWR "ON" with Remote Controller

Replace Scan Relay Board

Replace failed PCB

"SHUT DOWN"

accur?

Diagnosis Complete

Replace High

Voltage Board

Do DIODE TEST

On High Voltage, Scan Relay Board

Tests Passed?

-66-

10. ASSEMBLY LIST

No. PCB ASS’Y NAME ASS’Y CODE ASS’Y DESCRIPTION

1 PCB MAIN MANUAL AS PTMPMSG047 DPP-4272NHS
2 PCB SUB MANUAL AS PTSBMSG074 DPP-4272NBS
3 CABINET AS PTCACAG074 DPP-4272NBS
4 COVER BACK AS PTBCSHG047 DPP-4272NHS
5 MODULE PDP 4850M09610 NP42B3MF03
6 MODULE POWER 4850M06310 PDD-422
7 HIGH Voltage PKG 485AS06490 PKG42B3G1-01D
8 Common Bypass PKG 485AS06590 PKG42B3J4/42D2J4/35B2J4-01A
9 Common Relay PKG 485AS06690 PKG42B3J3-01A

10 Data Relay PKG(L) 485AS06790 PKG42B3J1-02B

11 Data Relay PKG(R) 485AS06890 PKG42B3J2-02B
12 Scan Relay PKG-T 485AS06990 PKG42B3E1-01B
13 Scan Relay PKG-B 485AS07090 PKG42B3E2-01B
14 Digital PKG 485AS07290 PKG42B3C1-01D-06
15 GLASS FILTER 485A100380 PDF-69J06H (921X518.4)
16 CONNECTOR 4850705N31 12505HS-05+12505TS+ULW=650
17 CONNECTOR 4850706N23 12505HS-06+12505TS+ULW=450
18 CONNECTOR 4850710N18 10+YMH025-10+ULW=300
19 CONNECTOR 4850732N01 YDH200-32 50MM
20 CONNECTOR 4850724N01 YDH200-24 50MM
21 CONNECTOR 4950704N28 YMH025-04R+YMT025R+ULW=400
22 CONNECTOR 4850704N32 GP-390-04S+YH396-10V+ULW=600
23 CONNECTOR 4850708N22 YH396-08V+YH396-10V+ULW=400
24 CONNECTOR 4959204020 YMW025-04R
25 PLATE INLET FILTER 4855217100 A5052 T1.0
26 SPEC PLATE 4955400100 P.E FILM 91.5X63
27 SCREW SPECIAL 4856017100 WAS M5X14
28 BRKT POWER MODULE 4853220100 SECC T1.0
29 BRACKET POWER SW 4953201000 SECC T0.8
30 MASK FRONT 4952002351 FR ABS GY
31 FILTER EMI 5P06GEEW3E 06GEEW3ES
32 SW PUSH 5S40101005 KDC-A04-10(B)-A1-G

-67-

11. STRUCTURE OF PDP SET

-68-

STRUCTURE OF PDP SET

COMPONENTS PICTURE REMARK

1) PDP MODULE
(with F/SUPPORT)

1a) HIGH

VOLTAGE
PKG

1b) Common

Bypass
PKG

1c) Common

Relay
PKG(R)

-69-

STRUCTURE OF PDP SET

COMPONENTS PICTURE REMARK

1d) Data

Relay
PKG(L)

1e) Data

Relay
PKG(R)

1f) Scan

Relay
PKG-T

1g) Scan

Relay
PKG-B

-70-

STRUCTURE OF PDP SET

COMPONENTS PICTURE REMARK

1h) Digital

PKG

2) MAIN BOARD

3) SUB BOARD

4) POWER BOARD

-71-

STRUCTURE OF PDP SET

COMPONENTS PICTURE REMARK

5) FRONT MASK

6) FILTER GLASS

7) BACK COVER

-72-

DAEWOO ELECTRONICS CORP.

PRINTED DATE : JUNE 2005

686, AHYEON-DONG, MAPO-GU,
SEOUL, KOREA.
C.P.O. BOX 8003 SEOUL KOREA