DOWNLOAD LG 55LV770S (CHASSIS:LD12D) Service Manual ↓ Size: 14.21 MB | Pages: 86 in PDF or view online for FREE

- 5 -

No. Item

Specification

Remarks

3 

Receiving system

Analog : Upper Heterodyne

G

Digital : COFDM , QAM

- Guard Interval(Bitrate_Mbit/s)

1/4, 1/8, 1/16, 1/32

- Modulation : Code Rate

QPSK    :  1/2, 2/3, 3/4, 5/6, 7/8

16-QAM  :  1/2, 2/3, 3/4, 5/6, 7/8

64-QAM  :  1/2, 2/3, 3/4, 5/6, 7/8

G

- Guard Interval(Bitrate_Mbit/s)

1/4,1/8,1/16,1/32,1/128,19/128,19/256,

- Modulation : Code Rate

QPSK    : 1/2, 2/5, 2/3, 3/4, 5/6

16-QAM  : 1/2, 2/5, 2/3, 3/4, 5/6

64-QAM  : 1/2, 2/5, 2/3, 3/4, 5/6

256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6

G

- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s

- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM

G

- Symbolrate

DVB-S2 (8PSK/ QPSK) : 2 ~ 45 Msymbol/s

DVB-S (QPSK) : 2~ 45 Msymbol/s

-viterbi

DVB-S mode :1/2, 2/3, 3/4, 5/6, 7/8

DVB-S2 mode : 1/2, 23, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10

4 

Scart Gender Jack(1EA) PAL, SECAM

Scart Jack is Full scart and support MNT/DTV-OUT, DTV Recording(not support DTV Auto AV)

5

Video Input RCA(2EA) PAL, SECAM, NTSC

4System : PAL, SECAM, NTSC, PAL60

Rear 1EA, AV gender jack 1EA

6

Head phone out

Antenna, AV1, AV2, AV3,  

Component, RGB, HDMI1, HDMI2,

HDMI3, HDMI4, USB 

7

Component Input(1EA) Y/Cb/Cr, Y/Pb/Pr

Component Gender 1EA

8

RGB Input

RGB-PC

Analog(D-SUB 15PIN)

9

HDMI Input (4EA)

HDMI1-DTV/DVI

PC(HDMI version 1.3)

HDMI2-DTV

Support HDCP

HDMI3-DTV

HDMI4-DTV

10

Audio Input (4EA)

RGB/DVI Audio, Component, AV1, 2

L/R Input

11

SDPIF out (1EA)

SPDIF out

12

USB (2EA)

EMF, DivX HD, For SVC(download)

JPEG, MP3, DivX HD

- 6 -

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

SDTV 

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 56.250 

50 

HDTV 

1080p

14.

1920x1080

67.5 60 HDTV 

1080p

No.

Specification

Proposed

Remarks

Resolution

H-freq(kHz)

V-freq(Hz)

Pixel Clock(MHz)

1.

720*400 

31.468 

70.08

28.321 

For only DOS mode

2.

640*480 

31.469 

59.94

25.17 

VESA

Input 848*480 60 Hz, 852*480 60 Hz

-> 640*480 60 Hz Display

3.

800*600

37.879

60.31

40.00 VESA 

4.

1024*768 48.363 60.00

65.00 VESA(XGA) 

5.

1360*768 47.72

59.8

84.75 

WXGA

6.

1920*1080 66.587

59.93

138.625  WUXGA

FHD 

model

- 7 -

No.

Resolution

H-freq(kHz)

V-freq.(Hz)

Pixel clock(MHz)

Proposed

Remark

1.

720*400 31.468 

70.08 

28.321 

HDCP

2.

640*480 31.469 

59.94 

25.17

VESA  HDCP

3. 800*600

37.879

60.31 

40.00 

VESA 

HDCP

4.

1024*768

48.363

60.00 65.00 

VESA(XGA)

HDCP

5.

1360*768 47.72 59.8 84.75

WXGA  HDCP

6.

1280*1024 63.595

60.0  108.875  SXGA

HDCP/FHD 

model

No.

Resolution

H-freq(kHz)

V-freq.(Hz)

Pixel clock(MHz)

Proposed

Remark

1.

720*480 31.469/31.5 

59.94/60

27.00/27.03

SDTV 

480P

2.

720*576 31.25 

50

54 

SDTV 

576P

3.

1280*720 37.500 

50

74.25 

HDTV 

720P

4.

1280*720 

44.96/45 

59.94 /60

74.17/74.25 

HDTV 720P

5.

1920*1080 

33.72/33.75 

59.94 /60

74.17/74.25 

HDTV 1080I

6.

1920*1080 28.125 50.00

74.25 

HDTV 

1080I

7.

1920*1080 26.97/27 

23.97/24

74.17/74.25 

HDTV 

1080P

8.

1920*1080

33.716/33.75

29.976 /30.00

74.25

HDTV 1080P

9.

1920*1080 56.250 50

148.5

HDTV 

1080P

10.

1920*1080 

67.43/67.5 

59.94 /60

148.35/148.50 

HDTV 1080P

- 8 -

This specification sheet is applied to all of the LED LCD TV
with LD12D chassis.

(1) Because this is not a hot chassis, it is not necessary to use

an isolation transformer. However, the use of isolation
transformer will help protect test instrument.

(2) Adjustment must be done in the correct order. 
(3) The adjustment must be performed in the circumstance of

25 ºC ± 5 ºC of temperature and 65 % ± 10 % of relative
humidity if there is no specific designation. 

(4) The input voltage of the receiver must keep AC 100-240

V~, 50 / 60Hz.

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

the adjustment when module is in the circumstance of over
15.

In case of keeping module is in the circumstance of 0 °C, it
should be placed in the circumstance of above 15 °C for 2
hours 

In case of keeping module is in the circumstance of below -
20 °C, it should be placed in the circumstance of above 15
°C for 3 hours.

[Caution] 
When still image is displayed for a period of 20 minutes or
longer (especially where W/B scale is strong. Digital pattern
13ch and/or Cross hatch pattern 09ch), there can some
afterimage in the black level area.

(1) Overview

ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
* If Adjust ADC is “OTP”, It doesn’t need ADC adjustment.

(GP3-BCM)

(2) Equipment & Condition

1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA,

pattern - 65)

- Resolution : 480i Comp1

1080P Comp1
1920*1080 RGB

- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7 ± 0.1 Vp-p
- Image

(3) Adjustment

1) Adjustment method

- Using RS-232, adjust items in the other shown in

“3.1.(3).3)”

2) Adj. protocol

Ref.) ADC Adj. RS232C Protocol_Ver1.0

3) Adj. order

- aa 00 00  [Enter ADC adj. mode]
- xb 00 04  [Change input source to Component1(480i&1080p)]
- ad 00 10  [Adjust 480i Comp1]
- xb 00 06  [Change input source to RGB(1024*768)]
- ad 00 10  [Adjust 1024*768 RGB]
- ad 00 90  End adj.

Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port
Communication Port connection

A

Com 1,2,3,4 and 115200(Baud rate)

Mode check : Online Only

A

Check the test process: DETECT -> MAC -> CI -> Widevine

A

Play : START

A

Result : Ready, Test, OK or NG

A

Printer Out(MAC Address Label)

Protocol

Command

Set ACK

Enter adj. mode

aa 00 00

a 00 OK00x

Source change

xb 00 40

b 00 OK40x (Adjust 480i, 1080p Comp1 )

xb 00 60 

b 00 OK60x (Adjust 1920*1080 RGB)

Begin adj.

ad 00 10

Return adj. result

OKx (Case of Success)

NGx (Case of Fail)

Read adj. data

(main)

(main)

ad 00 20 

000000000000000000000000007c007b006dx

(sub)

(Sub)

ad 00 21

000000070000000000000000007c00830077x

Confirm adj.

ad 00 99

NG 03 00x (Fail)

NG 03 01x (Fail)

NG 03 02x (Fail)

OK 03 03x (Success)

End adj.

aa 00 90

a 00 OK90x

 

PCBA 

PC(RS-232C)

 

RS-232C Po rt