Daewoo SL-500P Service Manual

Service Manual

LCD TV

CHASSIS : SL-500P

Model : DLP-26C2 DLP-26C3 DLP-32C1 DLP-32C2 DLP-32C3 DLP-32C5 DLP-32C6 DLP-32C7 DLP-37C3 DLP-37C7

S/M NO. : DSL500PEF0

Aug. 2007

Contents

1.Safety Precaution ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 3

2.Product Specification ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 4 2-1.Product Specification⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 4 2-2.Available Input Signal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 5

3.Block Diagram ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 6

4.Description of Each Block ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 8 4-1.Block Diagram of Main IC and TP ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 8 4-2.Overview ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 9

4-2-1.Composite video, Y/C(S-Video) and SCART(CVBS, RGB) composite video ⋯ 9 4-2-2.DTV/DVD signal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 11 4-2-3.PC(Personal Computer)signal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 13 4-2-4.HDMI signal ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 15 4-2-5.R/G/B Processing(SCART1, TELETEXT R/G/B) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 15 4-2-6.Audio signal processing, KEY, and LED ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 17

4-3.POWER PCB ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 22

5.SERVICE MODE ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 24 5-1.Entering SERVICE MODE ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 24

6.Main PCBs Trouble Diagnosis ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 26 6-1.Main PCBs Trouble Diagnosis⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 26

6-1-1.Common checking process when “No signal of Noraster” ⋯⋯⋯⋯⋯⋯⋯⋯⋯ 26 6-1-2.When No Sound ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 33 6-1-3.When Control Key does not operate⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 35 6-1-4.When Remote Controller does not operate⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 36

6-2.POWER PCB ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 38

7.Trouble Diagnosis⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 39 7-1.Facts you must know when Diagnosis or Repairing⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 39 7-2.Typical Symptoms of PCB problem or bad connection ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 40

8.Structure of LCD Set ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 41

9.Exploded View ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 43

10.Service Part List ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ 52

11.Circuit Diagram ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯100

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-3-

1. Safety Precautions

(1) When moving or laying down a LCD Set, please deal with care. Avoid any impact towards

the LCD Set.

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

check the broken Set’s condition, 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.

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

Sort out the screws and store them separately Because screws holding PCBs are working as electric circuit grounding, make sure to check if any screw is missing when assembling.

(5) A LCD Set contains different kinds of connector cables.

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

(6) When disconnecting connectors unplug the connectors slowly with care.

(7) 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, make sure to check their kind, position, and direction.

-4-

2. Product Specification

Features

LCD Panel

TV System

Input

Connector

Output

Connector

Sound

Output

Power

Consumption

Dimension

(W x H x D)

Screen Size Aspect Ratio

Resolution Pixel Pitch

Contrast

Ratio

Receiving

System

Stereo

System

26” 32”

16 : 9

1200 : 1

PAL, SECAM PAL, SECAM

FM MONO / 2-Carrier, NICAM

Channel

Memory

ANALOG : 0~99CH

75 Ohm Coaxial

S-Video

SCART

ANALOG : 0~99CH

75 Ohm Coaxial

Component

RCA X 1

PC RGB

D-Sub X 1

PC Audio

3.5mm Mini-Jack

Headphone

3.5mm Mini-Jack

10W

100W 115W

812 x 502.7 x 240

Max Power

Source

Set

Dimension

180VAC ~ 264VAC,

50~60Hz

806 x 628.5 x 250

180VAC ~ 264VAC,

50~60Hz

806 x 628.5 x 250 940 x 720 x 328.7

180VAC ~ 264VAC,

50~60Hz

180VAC ~ 264VAC,

50~60Hz

HDMI

RCA X 1 D-Sub X 1

FM MONO / 2-Carrier, NICAM

ANALOG : 0~99CH ANALOG : 0~99CH

75 Ohm Coaxial 75 Ohm Coaxial

RCA X 1 RCA X 1 D-Sub X 1 D-Sub X 1

3.5mm Mini-Jack

10W

135W 150W

3.5mm Mini-Jack 3.5mm Mini-Jack

10W 10W

1366x768(WXGA)

0.421(H) x

0.140(W)*3mm 800 : 1

PAL, SECAM PAL, SECAM

800 : 1 800 : 1

1366x768(WXGA) 1366x768(WXGA) 1366x768(WXGA)

170.25um x

510.75um x RGB

0.51075(H) x

0.17025(W)*3

0.200mm x

0.600mm x RGB

16 : 9 16 : 9 16 : 9

32” 37”

DLP-26C2SMDB

DLP-32C6LMBD

DLP-37C3LMBDDLP-32C6SMBD

2-1.PRODUCT SPECIFCATION

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Product Specification

2-2.Available Input Signal

2-2-1.HDMI/PC/COMPONENT

2-2-2.VIDEO

- PAL, PAL-M, PAL-N

- NTSC, NTSC4.43

- SECAM

Resolution

640 x 480

800 x 600

1024 x 768

1360 x 768

720 x 480

720 x 480i 720 x 576i

720 x 576

1280 x 720

1920 x 1080i

V-freg

60Hz

HDMI

X 72Hz 75Hz 60Hz 72Hz 75Hz 60Hz 70Hz 75Hz 60Hz 75Hz 60Hz 50Hz 50Hz 60Hz

50Hz 60Hz 60Hz 50Hz

O O

X X

PC(D-Sub) Component Standard

VESA Standard VESA Standard VESA Standard

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3. Block Diagram

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Block Diagram

-8-

4. Description of Each Block

4-1.Block Diagram of Main IC and TP

-9-

Description of Each Block

4-2.Overview

Digital PCB is Multi Media circuit board that can process carious input signals such as Video, component, PC, HDMI, and analog TV signal.

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

-Flow Chart of RF, Video, S-Video Signal

Y-pb-pr

Scart1-rgb-fb

R-G-B HY

Tuner Cvbs

HDMI TMDS-IN

AV3-Y/C

U13 MST96889LD

Scart1-Cvbs

LVDS

Scart1-Cvbs

AV3-Cvbs

-10-

Description of Each Block

Color signal(input to U13)

Location:R204

Y signal(input to U13)

Location:R206

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Description of Each Block

CVBS signal(input to U13)

Location:R219

Y signal(input to U13)

Location:R199

4-2-2.DTV/DVD signal

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Description of Each Block

PB signal(input to U13)

Location:R193

Pr signal(input to U13)

Location:R201

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Description of Each Block

R signal(input to U13)

Location:R171

G signal(input to U13)

Location:R170

B signal(input to U13)

Location:R168

4-2-3.PC(Personal Conputer) signal

-14-

Description of Each Block

Horizontal sync(Output of U13) Location:R98

Vertical sync(Output of U13) Location:R101

-15-

Description of Each Block

Location:R75, R76, R79, R80, R82, R84, R85, R86,

4-2-4.HDMI signal

R signal(input to U13) Location:R185

4-2-5.R/G/B PROCESSING(SCART 1, TELETEXT R/G/B)

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Description of Each Block

G signal(input to U13) Location:R182

B signal(input to U13) Location:R179

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Description of Each Block

4-2-6.Audio signal processing, KEY, and LED

-Flow Chart of Audio Signal

Pre AMP input Location:CE298, CE302

MST96889LD

TDA8931T

WM8521

TDA1308

Speaker L & Headphone L

Speaker R& Headphone R

U20

U21

U23

12S

U13

HDMI

COMP

AV3

SC2

SC1

RF(SIF)

Sound L

Sound R

SC1-OUT

-18-

Description of Each Block

U20, U21 input Location:CE258, CE275

U20, U21 output Location:CM262, CM279

-19-

Description of Each Block

SIF input Location:R147

I2S input Location:R65(CLK)

-20-

Description of Each Block

Location:R67

Remote control signal Location:R161

-21-

Description of Each Block

4-3.Power PCB

4-3-1.Power Spec

-Rating:180V ~ 264V

-Regulating Method:

-Input Frequency : 50/60Hz

-Inrush Current : Below 80A at AC 230V

-Output Voltage and Current are shown below

-Ripple and Noise Output Valtage

26” & 32”

Board

DEP

+29Vdc +27.0Vdc

+22.3Vdc

+32.0Vdc +25.4Vdc +12.0Vdc

+5.25Vdc +5.25Vdc

0.1A

0.3A

0.1A

0.5A

5.2A

1.2A

1.5A

0.2A

0.7A

6.0A

2.0A

0.3A

+11.0Vdc

+4.75Vdc +4.75Vdc

+24Vdc +12Vdc

+ 5Vdc

ST+5Vdc

MIN NOR MAX

Condition

PWR-CTL

OFF

Output Current

Output Voltage

Minimum Output Voltage

Maxmum Output Voltage

37”

Board

DEP

+29Vdc +27.0Vdc

+22.3Vdc

+32.0Vdc +25.4Vdc +12.0Vdc

+5.25Vdc +5.25Vdc

0.1A

0.3A

0.1A

0.5A

5.6A

1.2A

1.5A

0.2A

0.7A

6.5A

2.0A

0.3A

+11.0Vdc

+4.75Vdc +4.75Vdc

+24Vdc +12Vdc

+ 5Vdc

ST+5Vdc

MIN NOR MAX

Condition

PWR-CTL

OFF

Output Current

Output Voltage

Minimum Output Voltage

Maxmum Output Voltage

+29V +27.0Vdc

+22.3Vdc

+32.0Vdc +25.4Vdc +12.0Vdc

+5.25Vdc +5.25Vdc

500mVp-p

500mVp-p Don’t Care

Other Lines

+11.0Vdc

+4.75Vdc +4.75Vdc

+24V +12V

+ 5V

ST+5V

Continuous

Condition

MAX LOAD

PWR-CTR

PWR-CTL

OFF

AC ripple, switching ripple and noise

Output

Name

Minimum Output Voltage

Maxmum Output Voltage

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Description of Each Block

4-3-2.Connectors

A. CN7, CN8 pin Spec(YEON-HO 20010WS-14 14P)

B. CN5, CN6 pin Spec(YEON-HO 20010WS-12 12P)

CN7(AUO PANNEL)

PIN No.

1 2 3 4 5

6 7 8 9

10 11

12 13

Output

+24V +24V +24V +24V +24V GND

GND GND

DIMIMING

INV ON/OFF

N/C

GND

PIN No.

1 2 3 4 5

6 7 8 9

10 11

12 13

Output

+24V +24V +24V +24V +24V GND

GND GND

INV ON/OFF

CN5,CN6(LG PANNEL)

PIN No.

1 2 3

4 5 6 7 8

9 10 11

Output

+24V +24V +24V

+24V +24V GND

GND

GND GND GND

DIMIMING

INV ON/OFF

CN8(SAMSUNG PANNEL)

N/C

DIMIMING

N/C

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Description of Each Block

C.CN2 Pin Spec(YEON-HO YW025-04 4P)

PIN No.

1 2 3 4

Output

+29V +29V GND

GND

D.CN4 Pin Spec(YEON-HO SMW025-09 9P)

PIN No.

1 2 3 4

Output

+12V +12V GND

GND

+5VS

PWR ON/OFF

GND

+5VS

E.CN3 Pin Spec(CA3237W-300-08P)

PIN No.

1 2 3

Output

DIMIMING

INV ON/OFF

N/C

GND

GND 6 7 8

+5VS

+12V

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5. SERVICE MODE

5-1.Entering SERVICE MODE

Using the Service Remote controller, you can enter service mode directly.

5-1-1.Adjustment REMOCON and EEPROM Initial DATA

A.The adjustment Specification use the SERVICE REMOCON R-34SVC

(S/N:48B3034SVC)

B.Adjustment DATA

Key

Heat Run Mode Full White

2007. 05. 11

0-50-100-L-R

Black-W-R-G-B

to enter into Heat Run Mode

Sub Menu

Default Value

Description

Gumi Ch Map Write to set Gumi factory channels directly

Volume Test to set sound(display in sequence)

HDMI EDID WRITE to write HDMI EDID data directly from main chip

Test Pattem to display Test Pattem in sequence

Bri_Min-Cen-Max

Picture Test

DEMPOL CH Map Write

to test picture(displays in sequence)

Con_Min-Cen-Max

to test picture(displays in sequence)

Col_Min-Cen-Max

to test picture(displays in sequence) to test picture(displays in sequence)

Write Balance

S10 S11

S12

Sound Prescale

Sound Delay

Dimming Control

IFAGC Contronl

Frequency Gamma DLC Memory Recall Oper Mode Don’t use Version information

Factory Mode

Offset R

input Source Display

to display present input source mode

to display offset and gain value at mode above

to display the matched real value of the offset and gain

Offset G

Offset B

Gain R

Gain G

Gain B

Read Value

to display sound prescale value at each mode

to active or inactive sound delay mode

Speaker_SIF

32 Speaker_AV3 DVB Speaker_AV2 Speaker_HDMI

47 Speaker_AV1 PC COM

Scartout_SIF

88 Scartout_EXCEPTSIF

88 Delay Enable

to assign delay value

Delay value

OFF

254

to apply the changed value about sound delay to control the dimming value of the panel to adjust IF AGC value about signal except

SECAM L/L’ to adjust IF AGC value about SECAM L/L’

to display the frequency of the present signal to active or inactive gamma function to active or inactive DLC function to reset EEPROM Normal Mode-Debug Mode-Data Writing Mode

to display the date of the firm ware to initialize TV and make TV standby mode

¡

White Balance items(S8) are not initialized

Apply

IFAGC NORMAL

000 MHz

OFF OFF

NOR-DEB-DW

IFAGC L or L’

-25-

SERVICE MODE

5-1-2.Description of SERVICE MODE ITEM

A.S1(1) : Heat-Run Key B.S2(2) : Gumi Channel Map Write C.S3(3) : Volume Test

=> This key can check sound

D.S4(4) : EDIT WRITE

=> Using this key, you can up data EDID data. (but the “shunt”must be

connected, and only executed in the Factory.)

E.S5(5) : PANEL TEST

=> Using this key, you can test problem of PANEL, as confirm white pattern

red pattern, blue pattern, green pattern.

F.S6(6) : PICTURE TEST

=> Using this key, you can test brightness, contrast and color. G.S7(7): DEMPOL CHANNEL MAP WRITE H.S8(8) : White Balance adjustment

=> Using this key, you can adjust White balance. I.S9(9) : Device control

=> This key only use for R&D. J.S10(10) : Opion key

=> Using this key, you can adjust SSC, Dimming, panel Type and etc. K.S11(11) : Version key

=>Using this key, you can identify the information of the S/W of the set.

L.S12(SLEEP ) : Shipping key

=> Using this key, you can up at shipping mode.

-26-

Does No signal screen appear?

Is LVDS connection Correctly connected?

Is the signal input Jack properly?

Check start

Y Y

Does input source (AV device) work?

Is input selection in the Correct mode?

Is waveform of CLK in the Main PCB Normal?

Is a weak Discharge detected in the screen?

Check the connection of Jack (LCD and AV device)

Check AV device

Check input mode

Check LVD connection Panel & J10 of Main PCB

Replace Main PCB and/or Sub PCB

Check other PCBs and connectors

1.Check AC connection

2.Check Power S/W ON

3.Check other PCBs

6. Main PCBs Trouble Diagnosis

6-1.Main PCB Trouble Diagnosis

6-1-1.Common checking process when “No signal of Noraster”

No signal : OSD is work but no images are displying No raster : OSD as well as images in not working

-27-

Main PCBs Trouble Diagnosis

A.When “No signal”in CVBS(RF, AV)

1)First check if other inputs are working =>if other inputs are not working, replace MAIN PCB

2)Checking waveforms with Color Bar Pattern(Using the oscilloscope)

- Main TP(RF) : R219

- Main TP(RF) : R214

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Main PCBs Trouble Diagnosis

B.When “No signal”in Y/C signal(S-Video)

1)First check if other inputs are working =>if other inputs are not working, replace MAIN PCB

2)Checking waveforms with Color Bar Pattern(Using the oscilloscope)

- Main TP(Y signal) : R206

- Main TP(C signal) : R204

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Main PCBs Trouble Diagnosis

C.When “No signal”in Y/Pb/Pr signal(Component)

1)First check if other inputs are working =>if other inputs are not working, replace MAIN PCB

2)Checking waveforms with Color Bar Pattern(Using the oscilloscope)

- Main TP(COMP1- Y) : R199

- Main TP(COMP1-Pb) : R193

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Main PCBs Trouble Diagnosis

- Main TP(COMP1-Pr) : R201

D.When “No signal”in PC

1)First check if other inputs are working =>if other inputs are not working, replace MAIN PCB

2)Checking waveforms with Color Bar Pattern(Using the oscilloscope)

- Main TP(R signal) : R171

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