LG Electronics 640T-ZA Audio, USB S/W DownloadService only, GND and Internal Pressure check

4.12. GND and Internal Pressure check

4.12.1. Method

(1)GND & Internal Pressure auto-check preparation

-Check that Power cord is fully inserted to the SET. (If loose, re-insert)

(2)Perform GND & Internal Pressure auto-check

-Unit fully inserted Power cord, Antenna cable and A/V arrive to the auto-check process.

-Connect D-terminal to AV JACK TESTER

-Auto CONTROLLER(GWS103-4) ON

-Perform GND TEST

-If NG, Buzzer will sound to inform the operator.

-If OK, changeover to I/P check automatically. (Remove CORD, A/V form AV JACK BOX.)

-Perform I/P test

-If NG, Buzzer will sound to inform the operator.

-If OK, Good lamp will lit up and the stopper will allow the pallet to move on to next process.

4.12.2. Checkpoint

▪TEST voltage

-GND: 1.5 KV / min at 100 mA

-SIGNAL: 3 KV / min at 100 mA

▪TEST time: 1 second

▪TEST POINT

-GND TEST = POWER CORD GND & SIGNAL CABLE METAL GND

-Internal Pressure TEST = POWER CORD GND & LIVE &

NEUTRAL

▪LEAKAGE CURRENT: At 0.5 mArms

5.Audio

No.	Item	Min	Typ	Max	Unit	Remark
	Audio practical	9	10	12	W	EQ Off
1.	max Output, L/R					AVL Off
	(Distortion=10%		8.10	10.8	Vrms	Clear Voice Off
	max Output)
	Speaker (8Ω					EQ Off
2.		9	10	12	W	AVL Off
	Impedance)
						Clear Voice Off

Measurement condition:

(1)RF input: Mono, 1 KHz sine wave signal, 100 % Modulation

(2)CVBS, Component: 1 KHz sine wave signal 0.5 Vrms

(3)RGB PC: 1 KHz sine wave signal 0.7 Vrms

6.USB S/W Download(Service only)

(1)Put the USB Stick to the USB socket.

(2)Automatically detecting update file in USB Stick.

-If your downloaded program version in USB Stick is Low, it didn't work. But your downloaded version is High, USB data is automatically detecting.

(Download Version High & Power only mode, Set is

automatically Download)

(3) Show the message "Copying files from memory".

(4)Updating is starting.

(5)Updating Completed, The TV will restart automatically.

(6)If your TV is turned on, check your updated version and

Tool option. (explain the Tool option, next stage)

*If downloading version is more high than your TV have, TV can lost all channel data. In this case, you have to channel recover. if all channel data is cleared, you didn’t have a DTV/ ATV test on production line.

* After downloading, have to adjust Tool Option again.

(1)Push "IN-START" key in service remote control.

(2)Select "Tool Option 1" and push "OK" key.

(3)Punch in the number. (Each model has their number)

Copyright ©	LG Electronics. Inc. All rights reserved.	- 17 -	LGE Internal Use Only
Only for training and service purposes