How do i access the service menu on my lg 47ls4500

Hi,
use a phone camera and look at the front emitter LED the camera will show the invisible output as white light, if you indeed have output showing you can be reasonably sure the remote is working, here is a link for IR sensors on the plus side they all plug into the set with no soldering and just one screw.
IR Sensor Boards MBTV Electronics

Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Have screen replaced common fault.

Your LCD panel motherboard has gone dud. You need a new LCD panel...but probably a new tv!

If it powers ON, and do not display a screen, check and replace the back light inverter circuit.

this is all lg hard reset code you much enter it


LG
2945#*# - service menu (code reset)(W3000 G5300 C1200 G7100...)
2945#(*)- hold (LG 500,600)
B1200 *+pwr, 6,6,8 Service Menu
B1300 *+pwr, 1,5,9 Service Menu

Security Removing Code For Lg 8110,8120.
47328545454#
Or
277634#*#
LG
2945#*# - service menu (code reset)(W3000 G5300 C1200 G7100...)
2945#(*)- hold (LG 500,600)
B1200 *+pwr, 6,6,8 Service Menu
B1300 *+pwr, 1,5,9 Service Menu

Security Removing Code For Lg 8110,8120.
47328545454#
Or
277634#*#

U8180 old ...............49857465454#
U8180 new .............492662464663#
U8330 ...................637664#*#
U8360 ...................*6*41*12##
U8380 ...................525252#*#


ALL LG 2G : 2945#*#
8110 & 8120 : 277634#*#
U8130 & U8138 : 47328545454#
8180 old sw : 49857465454#
8180 new sw : 492662464663#
8330 : 637664#*#
8360 : *6*41*12##
8380 : 525252#*#

LG 8550 885508428679#*#
Phone
Service Menu Code

8110 277634#*#

8120 277634#*#

8130 47328545454#

8138 47328545454#

8180 v10A 49857465454#

8180 v11A 492662464663#

8330 637664#*#

8360 *6*41*12##

8380 525252#*#

8550 885508428679#*#

Phone
Unlock Menu Code

Older phones 2945#*88110#


U880
was told that unlocking code for the phone is "0794070061"
and method is to enter 142358#*#
but when i enter above code instead of asking for nck code it restarts(phone is temporary unlocked with sim inside).
Plz help how to unlock it permanently

I want enter the convergent net code

thank of you but i need access to menu service please help me
please mail key to access to menu service
thanks of you