DOWNLOAD LG 32LD550 (CHASSIS:LA02B) Service Manual ↓ Size: 4.9 MB | Pages: 58 in PDF or view online for FREE

- 9 -

No Resolution 

H-freq(kHz) V-freq.(kHz)  Pixel 

clock 

Proposed 

PC

DDC

1. 

640*350 

31.468 

70.09 

25.17   

EGA 

X  

2. 

720*400 

31.469 

70.08 

28.32   

DOS 

O 

3. 

640*480 

31.469 

59.94 

25.17   

VESA(VGA) 

O

4 .

800*600 

37.879 

60.31 

40.00   

VESA(SVGA) 

O 

5. 

1024*768 

48.363 

60.00 

65.00   

VESA(XGA) 

O 

6. 

1280*768 

47.776 

59.870 

79.50   

CVT(WXGA) 

X 

7. 1360*768 

47.712 

60.015 

85.50 

 

VESA(WXGA) 

X

8. 

1280*1024 

63.981 60.020 108.00 

 

 

VESA(SXGA)

O 

9. 

1920*1080 

67.5 

60 

148.5   

HDTV 1080P

O

DTV

1 720*480 

31.50 

2 

720*480 

31.47 

59.94 

27.00   

SDTV 480P 

3 

1280*720 

45.00 

60.00 

74.25   

HDTV 720P 

4 

1280*720 

44.96 

59.94 

74.176   

HDTV 720P 

5 

1920*1080 

33.75 

60.00 

74.25   

HDTV 1080I 

6 

1920*1080 

33.72 

59.94 

74.176   

HDTV 1080I 

7 

1920*1080 

67.500 

60 

148.50   

HDTV 1080P 

8 

1920*1080 

67.432 

59.939 

148.352   

HDTV 1080P 

9 

1920*1080 

27.000 

24.000 

74.25   

HDTV 1080P 

10 

1920*1080 

26.97 

23.976 

74.176   

HDTV 1080P 

11 

1920*1080 

33.75 

30.000 

74.25   

HDTV 1080P 

12 

1920*1080 

33.71

29.97 

74.176   

HDTV 1080P 

- 10 -

This spec. sheet applies to LA02B Chassis applied LCD TV all
models manufactured in TV factory 

2.1   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.  

2.2   AdjThe adjustment must be performed in the

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

2.4   The input voltage of the receiver must keep

100~240V, 50/60Hz.  

2.5   The receiver must be operated for about 5 minutes

prior to the adjustment when module is in the
circumstance of over 15 

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. 

• Adjust 480i Comp  
• Adjust 1080p Comp  
• Adjust RGB 

Above adjustment items can be also performed in Final
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Star Menu 1.ADJUST
CHECK.  

•  EDID/DDC download 
• White Balance adjustment 
• RS-232C functionality check  
• Factory Option setting per destination  
• Ship-out mode setting (In-Stop) 

• Ship-out mode 
• Tool option menu 
• USB Download(S/W Update, Option, Service only) 

(1) Overview

ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation. 

(2) Equipment & Condition

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

- Resolution : 480i Comp1 (MSPG-925FA: model-209,

pattern-65) 

- Resolution : 1024*768 RGB (Inner Pattern) 
- Pattern : Horizontal 100% Color Bar Pattern 
- Pattern level : 0.7±0.1 Vp-p

(3) Adjustment

1) Adjustment method

- Using RS-232, adjust items listed in 3.1 in the other

shown in “4.1.3.3”

2) Adj. protocol

Ref.) ADC Adj. RS232C Protocol_Ver1.0

3) Adj. order

- aa 00 00  [Enter ADC adj. mode] 
- xb 00 40  [Change input source to Component1(No

action)] 

- ad 00 10  [Adjust 480i Comp1] 
- ad 00 10  [Adjust 1080p Comp1] 
- xb 00 60  [Change input source to RGB(No action)] 
- ad 00 10  [Adjust 1080p RGB] 
- ad 00 90  End adj. 

Protocol

Command

Set ACK

Enter adj. mode

aa 00 00

a 00 OK00x

Source change

xb 00 40

b 00 OK40x (Adjust 480i Comp1 )

(Adjust 1080p Comp1) 

xb 00 60 

b 00 OK60x (Adjust 1080p RGB) 

Begin adj.

ad 00 10

Return adj. result

OKx (Case of Success)

NGx (Case of Fail)

Read adj. data

(main)

(main : component1 480i, RGB 1080p) 

ad 00 20 

000000000000000000000000007c007b006dx

(sub)

(main : component1 1080p)

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

- 11 -

4.2.1 Equipment & Condition 
• Play file: Serial.exe 
• MAC Address edit 
• Input Start / End MAC address  

4.2.2 Download method 
4.2.2.1 Communication Prot connection

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

4.2.2.2 MAC Address Download 
• Com 1,2,3,4 and 115200(Baudrate) 
• Port connection button click(1) 

• Load button click(2) for MAC Address write. 
• Start MAC Address write button(3) 
• Check the OK Or NG  

4.2.2.3 Input the ESN Key  
• download Model sending Key file 
• input by 1 by SET so as not to be duplicated 

4.3.1 Equipment & Condition 

• Each other connection to LAN Port of IP Hub and Jig 

4.3.2 LAN inspection solution 
• LAN Port connection with PCB 
• Network setting at MENU Mode of TV 
• setting automatic IP 
• Setting state confirmation 

- If automatic setting is finished, you confirm IP and MAC

Address. 

4.3.3 ESN Key confirmation  

• confirm Key input Data at ESN MENU Mode 

PC(RS-232C)

RS-232C Port

 

- 12 -

4.4.1. Equipment setting 

1) Play the LAN Port Test PROGRAM. 
2) Input IP set up for an inspection to Test  

Program. 

*IP Number : 12.12.2.2 

4.4.2. LAN PORT inspection  (PING TEST) 

1) Play the LAN Port Test Program. 
2) connect each other LAN Port Jack. 
3) Play Test (F9) button and confirm OK Message. 

4) remove LAN CABLE 

It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”. 

• Adjust remocon. 
• Since embedded EDID data is used, EDID download JIG,

HDMI cable and D-sub cable are not need. 

1) Press Adj. key on the Adj. R/C, 
2) Select EDID D/L menu. 
3) By pressing Enter key, EDID download will begin 
4) If Download is successful, OK is display, but If

Download is failure, NG is displayed. 

5) If Download is failure, Re-try downloads. 

•Caution) When EDID Download, must remove RGB/HDMI

Cable.