Problems with my LG 50" PLASMA ...

Ros3 · 29th April 2012, 20:51

My LG 50" plasma tv has developed 5 lines down the centre of the screen. They are very thin about a millimetre and they tend to move occasionaly to the left or right a bit. Anyone know what the problem is and can it be fixed on the cheap ??..

mamasboy · 29th April 2012, 21:08

Quote:

Originally Posted by ros3

My LG 50" plasma tv has developed 5 lines down the centre of the screen. They are very thin about a millimetre and they tend to move occasionaly to the left or right a bit. Anyone know what the problem is and can it be fixed on the cheap ??..

Normally it's a sign of t-con board failure, is it more on one side than the other, larger screens tend to have a 4-channel tcon and is split as two channels per side. Also the heat from the psu can damage the bonding of the ribbon cable to the screen, sometimes opening it up and packing some card between the chassis and the screen where the lines are can give a good temp repair.

mh007 · 29th April 2012, 21:09

I had a similar problem on one of my 50" LG Plasma's about a year ago.

Turned out to be interference from the power supply unit inside the TV.

Back cover off & it was a fair size unit.

It was done under warranty so I have no idea of actual cost.

Your fault may well be something different but that was my experience.

Ros3 · 29th April 2012, 21:22

Quote:

Originally Posted by mamasboy

Normally it's a sign of t-con board failure, is it more on one side than the other, larger screens tend to have a 4-channel tcon and is split as two channels per side. Also the heat from the psu can damage the bonding of the ribbon cable to the screen, sometimes opening it up and packing some card between the chassis and the screen where the lines are can give a good temp repair.

The line's are almost in the middle of the screen but tend to move slightly to the left or right by a centemetre or two. Is this an easy repair or am i better of getting a new telly. Also how easy is it to do the fix with card ?..

mamasboy · 30th April 2012, 12:03

Hi, if the lines are not fixed in one place consistantly then bonding issue is unlikley. It seems a T-Con issue or failing that a PSU one. The PSU issues tend to be slow start and then little or no functionality.
The T-Con is most likely and for a fairly capable person it easy enough. Make sure you have yourself grounded with an ESD strap first. The T-Con is at teh top centre as you look from the rear with the back off the TV. Samsungs are easily got at but the LG boards are normally buried beneath lots of metalwork which acts as a shielding canister. Once you get to it it's easy unplug and plug new board in.
If in doubt however dont attempt it.

29th April 2012, 20:51	#1
Ros3 This is my second home Rover 75 V6 saloon (gone to the Rover garage in the sky), Mazda mx5 Phoenix. Join Date: Feb 2011 Location: Cumnock Posts: 3,215 Thanks: 347 Thanked 157 Times in 92 Posts	Problems with my LG 50" PLASMA ... My LG 50" plasma tv has developed 5 lines down the centre of the screen. They are very thin about a millimetre and they tend to move occasionaly to the left or right a bit. Anyone know what the problem is and can it be fixed on the cheap ??..

30th April 2012, 12:03	#5
mamasboy RS South East Ford fester... blah.... Join Date: Mar 2010 Location: Hastings Posts: 2,900 Thanks: 29 Thanked 78 Times in 42 Posts	Hi, if the lines are not fixed in one place consistantly then bonding issue is unlikley. It seems a T-Con issue or failing that a PSU one. The PSU issues tend to be slow start and then little or no functionality. The T-Con is most likely and for a fairly capable person it easy enough. Make sure you have yourself grounded with an ESD strap first. The T-Con is at teh top centre as you look from the rear with the back off the TV. Samsungs are easily got at but the LG boards are normally buried beneath lots of metalwork which acts as a shielding canister. Once you get to it it's easy unplug and plug new board in. If in doubt however dont attempt it. __________________ the name's Bernard but you can call me nursie......

29th April 2012, 21:09	#3
mh007 This is my second home MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe Join Date: Jul 2009 Location: Keynsham, Bristol Posts: 4,211 Thanks: 65 Thanked 635 Times in 499 Posts	I had a similar problem on one of my 50" LG Plasma's about a year ago. Turned out to be interference from the power supply unit inside the TV. Back cover off & it was a fair size unit. It was done under warranty so I have no idea of actual cost. Your fault may well be something different but that was my experience.