LG 42PC56 Bedienungsanleitung

PLASMA TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : PD73A

MODEL : 42PC56 42PC56-ZD

website:htt ://biz.LGservice.com

- 2 -

CONTENTS

SAFETY PRECAUTIONS ....................................................................................3

SPECIFICATIONS ................................................................................................4

ADJUSTMENT INSTRUCTIONS .........................................................................6

TROUBLE SHOOTING GUIDE..........................................................................19

BLOCK DIAGRAM.............................................................................................29

EXPLODED VIE ..............................................................................................30

EXPLODED VIE PARTS LIST ........................................................................31

REPLACEMENT PARTS LIST...........................................................................32

SCHEMATIC DIAGRAM.........................................................................................

PRINTED CIRCUIT DIAGRAM ..............................................................................

- 3 -

SAFETY PRECAUTIONS

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the

Schematic Diagram and Replacement Parts List.

It is essential that these special safety parts sh uld be replaced with the same c mp nents as rec mmended in this manual t prevent

X-RADIATION, Sh ck, Fire, r ther Hazards.

D n t m dify the riginal design with ut permissi n f manufacturer.

General Guidance

An isolation Transformer should always be used during the

servicing f a receiver wh se chassis is n t is lated fr m the AC

p wer line. Use a transf rmer f adequate p wer rating as this

pr tects the technician fr m accidents resulting in pers nal injury

fr m electrical sh cks.

It will als pr tect the receiver and it's c mp nents fr m being

damaged by accidental sh rts f the circuitry that may be

inadvertently intr duced during the service perati n.

If any fuse ( r Fusible Resist r) in this m nit r is bl wn, replace it

with the specified.

When replacing a high wattage resist r (Oxide Metal Film Resist r,

ver 1W), keep the resist r 10mm away fr m PCB.

Keep wires away fr m high v ltage r high temperature parts.

Due t high vacuum and large surface area f picture tube,

extreme care sh uld be used in handling the Picture Tube.

D n t lift the Picture tube by it's Neck.

Leakage Current Cold Check(Antenna Cold Check)

With the instrument AC plug rem ved fr m AC s urce, c nnect an

electrical jumper acr ss the tw AC plug pr ngs. Place the AC

switch in the n p siti n, c nnect ne lead f hm-meter t the AC

plug pr ngs tied t gether and t uch ther hm-meter lead in turn t

each exp sed metallic parts such as antenna terminals, ph ne

jacks, etc.

If the exp sed metallic part has a return path t the chassis, the

measured resistance sh uld be between 1MΩ and 5.2MΩ.

When the exp sed metal has n return path t the chassis the

reading must be infinite.

An ther abn rmality exists that must be c rrected bef re the

receiver is returned t the cust mer.

Leakage Current Hot Check (See below Figure)

Plug the AC c rd directly int the AC utlet.

Do not use a line Isolation Transformer during this check.

C nnect 1.5K/10watt resist r in parallel with a 0.15uF capacit r

between a kn wn g d earth gr und (Water Pipe, C nduit, etc.)

and the exp sed metallic parts.

Measure the AC v ltage acr ss the resist r using AC v ltmeter

with 1000 hms/v lt r m re sensitivity.

Reverse plug the AC c rd int the AC utlet and repeat AC v ltage

measurements f r each exp sed metallic part. Any v ltage

measured must n t exceed 0.75 v lt RMS which is c rresp nds t

0.5mA.

In case any measurement is ut f the limits specified, there is

p ssibility f sh ck hazard and the set must be checked and

repaired bef re it is returned t the cust mer.

Leakage Current Hot Check circuit

1.5 K hm/10W

T Instrument's

exp sed 

METALLIC PARTS

G d Earth Gr und

such as WATER PIPE,

CONDUIT etc.

AC V lt-meter

IMPORTANT SAFETY NOTICE

0.15uF

SPECIFICATIONS

NOTE : Specifications and others are subject to change without notice for improvement

VApplication Range

This spec is applied to the 42” PL SM TV used PD73 Chassis.

V Specification

Each part is tested as below without special appointment.

1) Temperature : 25±5°C (77±9°F), CST : 40±5

2) Relative Humidity: 65±10%

3) Power Voltage: Standard Input voltage (100-240V~, 50/60Hz)

* Standard Voltage of each product is marked by models.

4) Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM.

5) The receiver must be operated for about 20 minutes prior to the adjustment.

VTest Method

1) Performance : LGE TV test method followed.

2) Demanded other specification

Safety : CE, IEC specification

EMC : CE, IEC

VGeneral Specification

1. Mod le Specification ( 42” XGA MODULE )

- 4 -

Display Screen Device

spect Ratio

PDP Module

Operating Environment

Storage Environment

Input Voltage

No Item Specification Remark

42” Wide Color Display Module

16:9

PDP42X4,

RGB Closed Type, Film Filter

1)Temp. : 0~40deg

2)Humidity : 20~80%

3)Temp. : -20~60deg

4)Humidity : 10~90%

100-240V~, 50/60Hz

Plasma Display Panel

LGE SPEC.

Maker LG

Chassis

PD73 42PC56-ZD UK, German, Italy, France, Sweden, Finland, Spain LG

Model Name Market Brand Remark

42PC56-ZD

Safety : IEC/EN60065

EMI : EN55013

EMS : EN55020

UK, German, Italy, France, Sweden, Finland, Spain TEST

Model pplianceMarket Remark

- 5 -

2. Model General Specification

Market

Br adcasting system

Receiving system

Scart Jack (2EA)

Vide Input (1EA)

S-Vide Input (1EA)

C mp nent Input (1EA)

RGB Input(1EA)

HDMI Input(2EA)

Audi Input (3EA)

N Item Specificati n Remark

UK, German, Italy, France, Sweden, Finland, Spain

1) PAL-BG

2) PAL-DK

3) PAL-I,I’

4) DVB-T(ID TV)

5) SECAM-L/L’

Anal g : Upper Heter dyne

Digital : COFDM

PAL, SECAM

PAL, SECAM, NTSC

Y/Cb/Cr, Y/Pb/Pr

RGB-PC

HDMI-DTV & SOUND

PC Audi , C mp nent, AV

4 System : PAL, SECAM, NTSC, PAL60

L/R Input

- 6 -

ADJUSTMENT INSTRUCTIONS

1. Application Object

These instructi ns are applied t all f the 42” PLASMA TV,

PD73A Chassis.

2. Note

(1) Because this is n t a h t chassis, it is n t necessary t use

an is lati n transf rmer. H wever, the use f is lati n

transf rmer will help pr tect test instrument.

(2) Adjustment must be d ne in the c rrect rder.

(3) The adjustment must be perf rmed in the circumstance f

25±5°C f temperature and 65±10% f relative humidity if

there is n specific designati n.

(4) The input v ltage f the receiver must keep 100-240V~,

50/60Hz.

(5) The receiver must be perated f r ab ut 15 minutes pri r

t the adjustment.

OAfter RGB Full white HEAT-RUN M de, the receiver must

be perated pri r t adjustment.

OEnter int HEAT-RUN MODE

1) Press the POWER ON KEY n R/C f r adjustment.

2) OSD display and screen display PATTERN MODE.

[Set is activated HEAT-RUN with ut signal generat r in

this m de.

[Single c l r pattern(RED/BLUE/GREEN) f HEAT-RUN

m de uses t check PANEL.

3. Channel memory Setting Method

: Y u can set channel mem ry by R/C f r adjustment.

1) Press ADJ key n R/C f r adjustment.

2) Press ENTER key n “System C ntr l3”.

3) Press VOL + key n “Channel Rec ver”.

4. PCMCIA CARD Checking Method

: Y u must adjust DTV 29 Channel and insert PCMCIA CARD

t s cket.

1) If PCMCIA CARD w rks n rmally, n rmal signals display

n screen.

But it w rks abn rmally, “N CA m dule” w rds display n

screen.

5. PO ER PCB Assy Voltage

Adjustments (Va, Vs V ltage adjustments)

5-1. Test Equipment : D.M.M. 1EA

5-2.Connection Diagram for Measuring

: refer t Fig.1

5-3. Adjustment Method

(1) Va Adjustment

1) After receiving 100% Full White Pattern, HEAT RUN.

2) C nnect + terminal f D.M.M t Va pin f P812, c nnect

- terminal t GND pin f P812.

3) After turning VR901, v ltage f D.M.M adjustment as

same as Va v ltage which n label f panel right/t p.

(Deviati n; ±0.5V)

(2) Vs Adjustment

1) C nnect + terminal f D.M.M t Vs pin f P812, c nnect

– terminal t GND pin f P812.

2) After turning VR951, v ltage f D.M.M adjustment as

same as Va v ltage which n label f panel right/t p.

(Deviati n; ±0.5V)

If y u turn n a still screen m re than 20 minutes (Especially

Digital pattern, Cr ss Hatch Pattern), an afterimage may ccur

in the black level part f the screen.

Each PCB assembly must be checked by check JIG set.

(Because p wer PCB Assembly damages t PDP M dule,

especially be careful)

(Fig. 1) C nnecti n diagram f p wer adjustment f r measuring

<42” EAY32808901>

<42” 6709900019A>

- 7 -

6. EDID (The Extended Display

Identification Data)/ DDC (Display

Data Channel) download

6-1. Required Test Equipment

1) Adjusting PC with S/W f r writing EDID Data.(S/W : EDID

TESTER Ver.2.5)

2) A Jig f r EDID D wnl ad

3) Cable : Serial(9Pin r USB) t D-sub 15Pin cable, D-sub

15Pin cable, DVI t HDMI cable

6-2. Setting of device

6-3. Preparation for Adjustment

1) As ab ve Fig. 2, C nnect the Set, EDID D wnl ad Jig, PC

& Cable.

2) Turn n the PC & EDID D wnl ad Jig. And Execute the

S/W : EDID TESTER Ver,2.5.

3) Set up S/W pti n.

Repeat Number : 5

Device Address : A0

PageByte : 8

4) P wer n the Set.

6-4. Sequence of Adjustment

- EDID Download

1) Init the data.

2) L ad the EDID data.(Open File).

[Anal g file] (f r RGB)

[Digital file] (f r HDMI)

3) Set the S/W as bel w.

4) Push the “Write Data & Verify”butt n. And c nfirm “Yes”.

5) If the writing is finished, y u will see the “OK” message.

6) If TV has tw HDMI, y u must d wnl ad tw times f r

each HDMI.

(Fig. 2) C nnecti n Diagram f DDC d wnl ad

Open FileOpen File

- 8 -

- EDID DATA

1) Anal g RGB.

=> Detail EDID Opti ns are bel w([1], [2], [3],[4], [5])

1. [1]-Pr duct ID

2. [2]-Serial N : C ntr lled n pr ducti n line

3. [3]-M nth, Year : C ntr lled n pr ducti n line

ex) Week : '03' => '03'

Year : '2006' => '10'

4. [4]-M del Name(Hex):

5. [5]-Checksum : Changeable by t tal EDID data

2) HDMI1.

=> Detail EDID Opti ns are bel w([1], [2], [3],[4], [5])

1. [1]-Pr duct ID

2. [2]-Serial N : C ntr lled n pr ducti n line

3. [3]-M nth, Year : C ntr lled n pr ducti n line

ex) Week : '03' => '03'

Year : '2006' => '10'

4. [4]-M del Name(Hex):

5. [5]-Checksum : Changeable by t tal EDID data

3) HDMI2.

=> Detail EDID Opti ns are bel w([1], [2], [3],[4], [5])

* Please refer HDMI1

M del

Name

42PC55-ZB

42PC56-ZD

50PC55-ZB

50PC56-ZD

50PB56-ZA

Pr duct ID

Pr duct ID EDID table

B19C

B39C

5FC3

61C3

63C3

Hex

9CB1

9CB3

C35F

C361

C363

40013

40015

50015

50017

50019

M del Name

42PC55-ZB

42PC56-ZD

50PC55-ZB

50PC56-ZD

50PB56-ZA

Hex Data

00 00 00 FC 00 34 32 50 43 35 35 2D 5A 42 0A 20 20 20

00 00 00 FC 00 34 32 50 43 35 36 2D 5A 44 0A 20 20 20

00 00 00 FC 00 35 30 50 43 35 35 2D 5A 42 0A 20 20 20

00 00 00 FC 00 35 30 50 43 35 36 2D 5A 44 0A 20 20 20

00 00 00 FC 00 35 30 50 42 36 35 2D 5A 41 0A 20 20 20

M del

Name

42PC55-ZB

42PC56-ZD

50PC55-ZB

50PC56-ZD

50PB56-ZA

Pr duct ID

Pr duct ID EDID table

B29C

B49C

60C3

62C3

64C3

Hex

9CB2

9CB4

C360

C362

C364

40114

40116

50016

50018

50020

M del Name

42PC55-ZB

42PC56-ZD

50PC55-ZB

50PC56-ZD

50PB56-ZA

Hex Data

00 00 00 FC 00 34 32 50 43 35 35 2D 5A 42 0A 20 20 20

00 00 00 FC 00 34 32 50 43 35 36 2D 5A 44 0A 20 20 20

00 00 00 FC 00 35 30 50 43 35 35 2D 5A 42 0A 20 20 20

00 00 00 FC 00 35 30 50 43 35 36 2D 5A 44 0A 20 20 20

00 00 00 FC 00 35 30 50 42 36 35 2D 5A 41 0A 20 20 20

- 9 -

7. ADC Calibration

8. Auto AV(CVBS) Color Balance

8-1. Requirement

VThis AV c l r balance adjustment sh uld be perf rmed

bef re white Balance Adjustment.

8-2. Required Equipment

1) Rem te c ntr ller f r adjustment.

2) MSPG-925FS Pattern Generat r (Which has Vide Signal:

7 C l r Bar Pattern sh wn in Fig. 3).

- M del: 202 / Pattern: 65 EC and FC m del use PAL-

BGDHI. (c mp site signal)

8-3. Method of Auto AV(CVBS) Color Balance

1) Input the Vide signal: 7 c l r Bar signal int AV3.

2) Set the PSM t Dynamic m de in the Picture menu.

3) Press IN-STAR key n R/C f r adjustment.

4) Press the G(V l. +) key perate t set, then it bec mes

aut matically.

5) Aut -RGB OK means c mpleted adjustment.

9. Adjustment of Component

9-1. Requirement

VThis AV c l r balance adjustment sh uld be perf rmed

bef re white Balance Adjustment.

9-2. Required Equipment

1) Rem te c ntr ller f r adjustment.

2) MSPG-925FS Pattern Generat r (Which has Vide Signal:

7 C l r Bar Pattern sh wn in Fig. 4).

- M del: 215 / Pattern: 65

9-3. Method of Auto Component Color Balance

1) Input the C mp nent 720p/50Hz 7 C l r Bar(MSPG-925FS

m del:215, pattern:65) signal int C mp nent.

2) Set the PSM t Dynamic m de in the Picture menu.

3) Press IN-STAR key n R/C f r adjustment.

4) Press the G(V l. +) key perate t set, then it bec mes

aut matically.

5) Aut -RGB OK means c mpleted adjustment.

10. Adjustment of RGB

10-1. Requirement

VThis AV c l r balance adjustment sh uld be perf rmed

bef re white Balance Adjustment.

10-2. Required Equipment

1) Rem te c ntr ller f r adjustment.

2) MSPG-925FS Pattern Generat r (Which has Vide Signal:

7 C l r Bar Pattern sh wn in Fig. 5).

- M del: 215 / Pattern: 65

10-3. Method of Auto RGB Color Balance

1) Input the PC 1024x768 @ 60Hz 7 c l r bar (MSPG-925FS,

M del:3, Pattern: 65) int RGB. (using D-sub t D-sub

cable)

2) Set the PSM t Dynamic m de in the Picture menu.

3) Press IN-STAR key n R/C f r adjustment.

4) Press the G(V l. +) key perate t set, then it bec mes

aut matically.

5) Aut -RGB OK means c mpleted adjustment.

MSPG925FS

C mp nent RGB-PCRF/AV/S-VIDEOADC

M del : 3

(1024*768 60Hz)

Pattern : 65

7 C l r Bar

M del:215(720P)

Pattern : 65

* 720/50Hz

7 C l r Bar

PAL

INPUT SELECT AV3

M del : 202

(PAL-BGDHI)

Pattern : 65

* PAL 7 C l r Bar

- System c ntr l RS-232 H st sh uld be “PC“ f r adjustment.

- Bef re AV ADC Calibrati n, execute the “Panel size selecti n“

(Fig. 4) C l r bar Test Pattern

(Fig. 3) C l r Balance signal

(Fig. 5) C l r bar Test Pattern

- 10 -

11. Adjustment of hite Balance

11-1. Requirement

VBef re adjusting White-balance , the AV ADC sh uld be

d ne.

11-2. Required Equipment

1) Rem te c ntr ller f r adjustment.

2) C l r Analyzer.( CA-1000,CA-100+,CA-200 r same

pr duct ) : CH10(PDP)

* Please adjust CA-210, CA-100+ by CS-1000 before

measuring.

3) Aut W/B adjustment instrument.( nly f r Aut adjustment)

4) AV Pattern Generat r.

W Synchr nizati n relati n between PSM and CSM.

CS-1000/CA-100+/CA-210 White balance adjustment c rdinate

and c l r temperature.

11-3. Connection Picture of the Measuring

Instrument(On Automatic control)

V Inside PATTERN is used when W/B is c ntr lled. C nnect

t aut c ntr ller r push c ntr l R/C IN-START -> Enter

the m de f White-Balance, the pattern will c me ut.

V Aut -c ntr l interface and directi ns

1. Adjust in the place where the influx f light like fl dlight

ar und is bl cked.(illuminati n is less than 10ux)

2. Measure and adjust after sticking the C l r Analyzer(CA-

100+, CA210) t the side f the m dule.

3. Aging time : keep white pattern using inside pattern.

WAut adjustment Map(RS-232C)

12. Adjustment of hite Balance

(Manual white Balance)

V One f R Gain/ G Gain/ B Gain sh uld be kept n 80, and

thers are c ntr lled l wering fr m 80

(1) ‘p wer n’ f the c ntr l R/C, set heat run t white by

pressing and heat run ver 15 minutes. (Set: RS-232 H st:

PC, Baud Rate: 115200bps, D wnl ad: C rtez)

(2) Zer Calibrate CA-100+, and stick the sens r t the center

f PDP m dule surface when y u adjust.

(3) D uble click In-start key n C ntr lling R/C and get in

‘white balance’.

(4) Set test-pattern n and display inside pattern. C ntr l is

carried ut n three c l r temperature, COOL, MEDIUM,

WARM. (C ntr l is carried ut three times.)

(5) When the R/G/B GAIN is 80 n OSD, it is the FULL

DYNAMIC Range f the M dule. In rder t c ntr l white

balance with ut the saturati n f FULL DYNAMIC Range

and DATA, ne f R Gain / G Gain / B Gain sh uld be kept

n 80, and ther tw is c ntr lled l wering fr m 80.

* C l r Temperature: C l, Medium, Warm

(1) When R GAIN is set t 80

- C ntr l G GAIN and B GAIN by l wering fr m 80.

(2) When B GAIN is set t 80

- C ntr l R GAIN and G GAIN by l wering fr m 80.

(3) When G GAIN is set t 80

- C ntr l R GAIN and B GAIN by l wering fr m 80.

One f R Gain / G Gain / B Gain sh uld be kept n 80, and

adjust ther tw l wer than 80.

(When R/G/B GAIN are all 80, it is the FULL DYNAMIC

Range f M dule)

(Fig. 6) Aut AV(CVBS) C l r Balance Test Pattern

Full White Pattern

RS-232C C mmunicati n

CA-210

C l r

ANALYZER

TYPE : CA-210

Type

Baud Rate

115200

Index

R Gain

G Gain

B Gain

R Offset

G Offset

B Offset

Data bit

Cmd1 Cmd2

St p bit

Parity

NONE

PD73A

Pr t c l

Setting

Data Min Value

00(00)

Max Value

128(80)

C l r C rdinate

0.283±0.002

0.293±0.002

0.329±0.00

11000K

9300K

6500K

0.000

0.003

0.276±0.002

0.285±0.002

0.313±0.00

COOL

MEDIUM

WARM

M de Temp uv

PLASMA Remark

11000K

9300K

6500K

C l

N rmal

Warm

CSM

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