DOWNLOAD LG 42LH50 (CHASSIS:LA91L) Service Manual ↓ Size: 11.44 MB | Pages: 40 in PDF or view online for FREE

- 9 -

 

Width (W) 

Length (D)

Height (H) 

mm 

 

1052.2

719.1 mm 

With Stand 

Before Packing 

1052.2

296.2

90.8

657.3 mm 

Without Stand 

1. 

Product 
Dimension 

After Packing 

1330

228

770 mm 

With Stand 

With Stand 

19.0kg

Only SET 

17.2Kg

Without Stand

2. 

Product 
Weight 

With BOX 

23.5kg 

Kg 

Kg 

Kg 

With Stand 

40ft

40ft(H-CUBIC) 

 

 

Indi.

Wooden

Indi. Wooden 

3. 

Container 
Loading 
Quantity 

Individual or 

Palletizing              

270 - 

270 - 

4. Stand 

Assy 

Swivel Degree

Swivel Force

Swivel(+/- 20degree) 

1.5 Kgf(0.8Kgf ~ 2.5Kgf) 

5. Appearance 

General  

Refer to Standard of LG(56)G4-9002 

 

 

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This specification sheet applied to LA91L Chassis applied
LCD TV all models manufactured in TV factory.

(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 equipment.

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

20±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.

(4) The input voltage of the receiver be must kept 100V-240V,

50/60Hz when adjusting.

(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.

• MAC Address Download, ESN Key Write 
• Adjust 720P Comp1 
• Adjust 1024*768 RGB 
• EDID/DDC download 

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.

• White Balance adjustment 
• RS-232C functionality check 
• PING Test 
• Factory Option setting per destination 
• Ship-out mode setting (In-Stop) 

• Ship-out mode
• Service Option Default
• USB Download(S/W Update, Option, Service only)
• ISP Download(Option)

(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 : 720p Comp1 (MSPG-925FA: model-209,

pattern-65)

1024*768 RGB (MSPG-925FA: model-60 , pattern-65)

- 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 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(480i)]
- ad 00 10  [Adjust 480i Comp1]
- xb 00 60  [Change input source to RGB(1024*768)]
- ad 00 10  [Adjust 1024*768 RGB]
- ad 00 90  End adj.

Protocol

Command

Set ACK 

Enter adj. mode 

aa 00 00 

a 00 OK00x 

Source change 

xb 00 40 

xb 00 60   

b 00 OK40x (Adjust 720p Comp1 ) 

b 00 OK60x (Adjust 1024*768 RGB) 

Begin adj. 

ad 00 10 

 

Return adj. result   

OKx (Case of Success) 

NGx (Case of Fail) 

Read adj. data 

(main) 

ad 00 20   

 

(sub ) 

ad 00 21 

(main) 

000000000000000000000000007c007b006dx 

 

(Sub) 

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 

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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 

(RS-232C)

RS-232C Port

 

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 

5.1.1 Overview 

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

5.1.2 Equipment & Condition 

1) Adjust Remocon
2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern

Generator

- Resolution: 720p, 1024*768 ‘
- Pattern : Horizontal 100% Color Bar Pattern 
- Pattern level: 0.7±0.1 Vp-p
- Image

3) Must use standard cable

5.1.3 Adjust method 

5.1.3.1 ADC 720p Comp1 

1) Check connected condition of Comp1 cable to the

equipment 

2) Give a 720p Mode, Horizontal 100% Color Bar Pattern

to Comp1. 

(MSPG-925FA => Model: 209, Pattern: 65)

3) Change input mode as Component1 and picture mode

as “Standard”

4) Press the In-start Key on the ADJ remote after at least

1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 720p on the menu. Press enter key. The
adjustment will start automatically.

5) If ADC calibration is successful, “ADC RGB Success”

is displayed.

If ADC calibration is failure, “ADC RGB Fail” is
displayed.

6) If ADC calibration is failure, after recheck ADC pattern

or condition retry calibration. Error message refer to 

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