DOWNLOAD LG 47LH7000 / 47LH7020 / 47LH7030 (CHASSIS:LD91D) Service Manual ↓ Size: 3.51 MB | Pages: 35 in PDF or view online for FREE

- 5 -

IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.

Removal
1.  Desolder and straighten each IC lead in one operation by gently

prying up on the lead with the soldering iron tip as the solder
melts.

2.  Draw away the melted solder with an anti-static suction-type

solder removal device (or with solder braid) before removing the
IC.

Replacement
1.  Carefully insert the replacement IC in the circuit board.
2.  Carefully bend each IC lead against the circuit foil pad and

solder it.

3.  Clean the soldered areas with a small wire-bristle brush.

(It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor
Removal/Replacement
1.  Remove the defective transistor by clipping its leads as close as

possible to the component body.

2.  Bend into a "U" shape the end of each of three leads remaining

on the circuit board.

3.  Bend into a "U" shape the replacement transistor leads.
4.  Connect the replacement transistor leads to the corresponding

leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.

Power Output, Transistor Device
Removal/Replacement
1.  Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3.  Carefully remove the transistor from the heat sink of the circuit

board.

4.  Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6.  Replace heat sink.

Diode Removal/Replacement
1.  Remove defective diode by clipping its leads as close as

possible to diode body.

2.  Bend the two remaining leads perpendicular y to the circuit

board.

3.  Observing diode polarity, wrap each lead of the new diode

around the corresponding lead on the circuit board.

4.  Securely crimp each connection and solder it.
5.

Inspect (on the circuit board copper side) the solder joints of

the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.

Fuse and Conventional Resistor
Removal/Replacement
1.  Clip each fuse or resistor lead at top of the circuit board hollow

stake.

2.  Securely crimp the leads of replacement component around

notch at stake top.

3.  Solder the connections.

CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.

Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.

At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).

1.  Carefully remove the damaged copper pattern with a sharp

knife. (Remove only as much copper as absolutely necessary).

2.  carefully scratch away the solder resist and acrylic coating (if

used) from the end of the remaining copper pattern.

3.  Bend a small "U" in one end of a small gauge jumper wire and

carefully crimp it around the IC pin. Solder the IC connection.

4.  Route the jumper wire along the path of the out-away copper

pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.

At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.

1.  Remove the defective copper pattern with a sharp knife.

Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.

2.  Trace along the copper pattern from both sides of the pattern

break and locate the nearest component that is directly
connected to the affected copper pattern.

3.  Connect insulated 20-gauge jumper wire from the lead of the

nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

- 6 -

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

This specification is applied to the LCD TV used LD91D
chassis.

Each part is tested as below without special appointment.

1) Temperature :  25±5ºC (77±9ºF), CST : 40±5ºC
2) Relative Humidity :  65±10%
3) Power Voltage : Standard input voltage(100~240V@50/60Hz)

* Standard Voltage of each products is marked by models.

4) Specification and performance of each parts are followed

each drawing and specification by part number in
accordance with BOM.

5) The receiver must be operated for about 5 minutes prior to

the adjustment.

1) Performance: LGE TV test method followed 
2) Demanded other specification 

- Safety: CE/IEC specification
- EMC: CE/IEC

No

Item Specification 

Remark

1

Display Screen Device 

47 wide Color Display Module 

LCD

2

Aspect Ratio

16:9

3

LCD Module 

47” TFT LCD FHD 100Hz

LGD

4

Operating Environment  Temp. : 0 ~50 deg

Humidity : 20 ~90 %

5

Storage Environment 

Temp. : -20 ~60 deg

Humidity : 10 ~90 %

6

Input Voltage 

AC100-240V~, 50/60Hz

7

Power consumption

Power on  (White)

47” LGD

Typ : 213, Max : 240 

LCD(Module) + Backlight(Lamp)

8

Module Size

47” LGD

1075.6(H) x 620.8(V) x 30.3mm(D)

9

Pixel Pitch

47” LGD

0.5415(H) x 0.5415(V)

10

Backlight  

22 EEFL

11

Display Colors

1.06B(true) colors

12

Coating 3H(Hard 

coating)

(1) Module optical specification

1) Stable for approximately 60 minutes in a dark environment at 25±2ºC and windless room
2) Operating Ambient Humidity : Min 10, Max 90% RH
3) Supply Voltage : 24V
4) Frame Frequency : 120Hz

(2) Chroma (PSM: Vivid, Color Temperature: Cool)

- except “RGB PC Mode PSM:Standard,Color Temperature:Medium”
**The W/B Tolerance is ±0.002 for Adjustment, but for DQA ±0.015

(3) SET Optical Feature

1) General feature

* Measurement Condition: Full white/Dynamic) -> Measure the black luminance after 30 seconds.

2) Special feature (Dynamic CR 15000:1)

- 7 -

No.

Item Specification 

Min.

Typ.

Max.

Remark

1.

Viewing Angle<CR>10>

Right/Left/Up/Down 

89/89

CR>10

89/89

2.

Luminance

Luminance (cd/m2)

400 

500

PSM:Vivid,CSM:Cool, 

White(100IRE)

Dynamic contrast :off

Dynamic color L off

Variation 1.3 

MAX 

/MIN

3.

Contrast Ratio 

CR 

1000 

1300

4.

CIE Color Coordinates

White

Wx

Typ 

0.279

Typ 

PSM:Vivid,CSM:Cool,

Wy

-0.03

0.292

+0.03

White(85IRE)

RED

Xr

0.638

Dynamic contrast :off

Yr

0.335

Dynamic color L off

Xg 0.289

Green

Yg 0.609

Xb 0.145

Blue

Yb

0.063

No Item 

Min

Typ 

Max 

Remark

1.

Cool

White Balance,X axis

0.274 

0.276

0.278

DQA : ±0.015

White Balance,Y axis

0.281  

0.283

0.285

DQA : ±0.015

2. 

Medium

White Balance,X axis

0.283 

0.285

0.287

DQA : ±0.015

White Balance,Y axis

0.291 

0.293

0.295

DQA : ±0.015

3.

Warm

White Balance,X axis

0.311 

0.313

0.315

DQA : ±0.015

White Balance,Y axis

0.327 

0.329

0.331

DQA : ±0.015

No 

Item

Min

typ

Max

Inch

Power Board P/N

Remark

1

Dynamic CR

10000 

15000

47”

EAY58470001

HDMI 720p Full Black Pattern

(Only HDMI mode) 

No Item

Module

Luminance (min)

C/R(min)

Remark

AV,COMPONENT,HDMI AV,COMPONENT,HDMI

1. 

47 inch

LGD

400cd/m2

1000 

except from the PC mode.

- 8 -

No

Specification

Remark

Resolution

H-freq(kHz)

V-freq(Hz)

1.

720x480 15.73 

60.00 

SDTV,DVD 

480i

2.

720x480 15.63 

59.94

SDTV,DVD 

480i

3.

720x480 31.47

59.94

480p

4.

720x480 31.50 

60.00

480p

5.

720x576 

15.625 

50.00

SDTV,DVD 625 Line

6.

720x576 31.25 

50.00

HDTV 

576p

7.

1280x720 45.00

50.00

HDTV 

720p

8.

1280x720 44.96

59.94

HDTV 

720p

9.

1280x720 45.00

60.00

HDTV 

720p

10.

1920x1080

31.25

50.00

HDTV 1080i

11.

1920x1080 33.75 

60.00

HDTV 

1080i

12.

1920x1080 33.72 

59.94

HDTV 

1080i

13.

1920x1080 26.97/27 

23.97/24

HDTV 

1080p

14.

1920x1080 33.716/33.75 

29.976/30.00

HDTV 

1080p

15.

1920x1080 56.250 

50

HDTV 

1080p

16.

1920x1080 67.43/67.5  59.94/60

HDTV 

1080p

No

Resolution

H-freq(kHz)

V-freq.(Hz)

Pixel clock(MHz)

Proposed

Remark

1.

720x400 31.468 

70.08  28.321

2.

640x480 31.469 

59.94

25.17

VESA

37.684 75.00

31.50

3. 800x600

37.879 

60.31

40.00 

VESA

46.875 75.00

49.50

4.

832x624 49.725 

74.55  57.283 

Macintosh

5. 1024x768

48.363 

60.00 

65.00 

VESA(XGA)

56.470 70.00 

75.00

60.123

75.029

78.75

6. 1280x768 

47.78 

59.87 

79.5 

WXGA

7. 1360x768 

47.72 

59.8 

84.75 

WXGA

8. 1366x768

47.56 

59.6 

84.75 

WXGA

9. 1280x1024 

63.595 

60.0 

108.875 

SXGA

10. 1920x1080

66.647 

59.988 

138.625 

WUXGA