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LG 47LC7DF 47 in. LCD HDTV Questions & Answers
Lg tv no sound or picture, blinking green light but back light on
The common problem is the main board, instead to purchase a expensive main board, you may try to re-flow the soldering on the main board, it is the only way you may fix the main board at your home.
Re-Flow Soldering Procedure for LG Main Board
1.Pre-heat your kitchen oven to 385 degree (No more than 400 degree);
2.Put the main board on a card board (like a pizza box board) in the oven;
3.Heat it for 10 minutes (No more than 10 minutes);
4.Turn the oven off & leave the door open, at this moment, do not touch or move the board until it colds down to the room temperature.
5.Install the board in the TV & try it out.
LG 47LN5400-UA has sound but no picture. Could it be the T-Con board?
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
LG LCD TV won't respond to remote controllers
sparrow00, your fix worked for me, and I think I know why. The 1/8" remote input jack on the back of the TV has electrical contacts inside that are probably there to sense the presence of a plug-in remote. When they detect the insertion of this plug they disable the front panel IR (infrared) receiver and the TV only responds to this plugged-in remote and the buttons on the TV itself. After some period of time these contacts get corroded and the circuit is no longer completed between them. The TV now thinks an external remote is plugged in, and it ignores its own front panel IR receiver.
When you plug a 1/8" plug into this remote socket on the back of the TV it wipes away the corrosion. When you remove the plug the internal contacts conduct properly again and the TV responds to its front panel IR receiver. For best results you should plug a 1/8" headphone plug into this remote jack and twist it a few times, then pull it out and repeat several times. Repeat every frew months or whenever the TV acts up.
Thanks for your solution!
Why is tv picture shrinking
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.
How do you do a factory reset for this tv
To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here.
Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
Lcd tv Inverter problem
Check and replace damaged component/s at its backlight inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "
Mosaic" or "
Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
Do a search by type in the brand name of your device at its search box. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
Sound but no picture
No back-light. Check and replace damaged component/s at its backlight inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "
Mosaic" or "
Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
No sound
Make sure your not using spanish audio programming make sure its not muted depending on the tv some tvs have speaker off and the audio would pass through the rca out.. If your using equipment to view tv make sure your audio in is plugged in.. Change channels and see if you have audio than
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