Hi guys I'm considering picking up my second broken tv to attempt to repair. You guys did a great job helping me fix my first. Anyways I want to see of this problem has been heard of or if it's most deffinately going to be a logic board replacement LG 42LK450. Has no hdmi sound or video . Component video works but still no sound. Thanks for any input
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LG 42LK450 no sound or hdmi
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Re: LG 42LK450 no sound or hdmi
hello i have a very similar issue to the op. i managed to source a mainboard and the sound now works. i have found however my picture has very strange colour. i know that the reason for this is that the board i have is programmed for a 37lk450 and the not the 42lk450 i need. i have found how to get in the instart service menu but am beign asked for a password. please help i have spent a day messing around only to be defeated by a 4 digit number lol.
i have tried
0000
1234
0413
7777
8 7 4 1
8 7 4 3
8 8 7 8
many thanks
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Re: LG 42LK450 no sound or hdmi
Originally posted by rawsy View Posthello i have a very similar issue to the op. i managed to source a mainboard and the sound now works. i have found however my picture has very strange colour. i know that the reason for this is that the board i have is programmed for a 37lk450 and the not the 42lk450 i need. i have found how to get in the instart service menu but am beign asked for a password. please help i have spent a day messing around only to be defeated by a 4 digit number lol.
i have tried
0000
1234
0413
7777
8 7 4 1
8 7 4 3
8 8 7 8
many thanksfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!
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Re: LG 42LK450 no sound or hdmi
thanks for responding. i was just about to post how i did it. the only way i could get n to the menu was buy programming a one4all remote i found the instructions herefor future reference.
all the other methods i tried would not work. none of the passwords would work so i updated the firmware and all of a sudden they worked. if anyone is to try this it isnt just a case of changing the screen size in the options all the other settings need to be changed too. its fairly easy though as the tool options are listed 1 - 5 and have a code next to them which denominate all of the settings. so just change them to what the origional board was set to and away you go.
thanks for trying to help , i managed to sort it after 7 hours of messing around.
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Re: LG 42LK450 no sound or hdmi
I have installed the same 37LK450 board in a 42LV3500 TV and it works great, except the screen is upside down.
Did you see any setting in there, with that I could flip the screen?
I can't get to the service menu.
The LV3500 doesn't even has a Menu button on the TV itself, just Home, Enter, Input, Channel up/down and Volume up/down.
I'm scared to update the firmware, because it may not work with this screen. Which firmware should I use, the 37LK450 or the 42LV3500?
What would you do in my situation?Last edited by tibimakai; 03-14-2014, 01:10 PM.
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Re: LG 42LK450 no sound or hdmi
@tibimakai, what is the screen model number, some panel has one control pin for the picture rotation.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: LG 42LK450 no sound or hdmi
If you look at the details, it is the pin on the LVDS connector on the T-CON board, see pin 6 if it is High or low.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: LG 42LK450 no sound or hdmi
High (3.3V) = ROTATE ENABLE. is there cable connected to that pin 6?, if not, use 3.3V power supply (3AA may work) to feed that pin through 1K, if there is wire connected to that pin 6, you will have to cut it so it will allow the pin 6 to go HI.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: LG 42LK450 no sound or hdmi
They are called VIAS, I am sure there are 3.3V power supply on the T-CON, just have to look for 3.3V regulator IC.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: LG 42LK450 no sound or hdmi
Actually, I have just found it and it's the same:
http://wenku.baidu.com/view/e4db3926482fb4daa58d4b83
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