Samsung LE-46M86BD Picture Issues

[Jasgriff]

Hi,

Just picked up this this TV.

The reported issues were lines down the left hand side of the screen and no sound.

I have plugged it in and can see the lines down the left hand side of the screen. As you can see in the picture though the whole screen seems to be ghosting and suffering from interference.

It also looks like when you push on the screen some of the interference goes but the lines and the ghosting remains.

I am going to have the back off shortly to try and reseat the cables and see if that has any effect.

[tom66]

Re: Samsung LE-46M86BD Picture Issues

Looks a lot like a T-con problem. The ghosting is probably caused by insufficient OFF voltage, which is used to turn off the pixels in the LCD. Budm might be able to help here.

To eliminate the main board and cabling (to T-con), you can try the trick of changing the LVDS format.

[retiredcaps]

Re: Samsung LE-46M86BD Picture Issues

momaka discusses t-con troubleshooting for a LCD monitor (post #13 - different problem), but the principle should be the same for a LCD TV.

https://www.badcaps.net/forum/showthread.php?t=17904

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

Yeah I looked in the menu but couldn't find the LVDS option I will get back into the menu and see if I can find it. I have found out why there is not sound.... Someone has removed the speakers! There were also some wedges in the top of the screen so someone has tried to remove the ghosting with them.

Looks like I have a right dog here.

[tom66]

Re: Samsung LE-46M86BD Picture Issues

Yeah I looked in the menu but couldn't find the LVDS option I will get back into the menu and see if I can find it. I have found out why there is not sound.... Someone has removed the speakers! There were also some wedges in the top of the screen so someone has tried to remove the ghosting with them.

Looks like I have a right dog here.

I have some spare speakers for a few TVs if you are interested.

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

If I can get the picture sorted then I will definitely be interested. just going to clean the ribbons and then try again. IF not then I will get back into the service menu. Hopefully all before tea arrives

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

momaka discusses t-con troubleshooting for a LCD monitor (post #13 - different problem), but the principle should be the same for a LCD TV.

https://www.badcaps.net/forum/showthread.php?t=17904

I will have a read through this also.

[cashkennedy]

Re: Samsung LE-46M86BD Picture Issues

Jeez no one mentioned this yet????

46 and 52" samsungs and sonys > from 2008-2010 , samsung brand panels

These all get tab bonding issues where you get a darker picture and ghosting. usually its the top left tab and pressing on it, or twisting the whole tv will fix the picture. The wedges were probably an attempt to fix tab bonding issues, but they could have put too much pressure and missaligned the tab at the top > causing your lines.

This is generally not fixable.

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

I thought it might have had something to do with the tab bondings.

twisting makes it better but does not cure it. I assume they have damaged it. Oh well I am sure I can get something back for the T-com, main board, power supply and inverter boards.

[tom66]

Re: Samsung LE-46M86BD Picture Issues

I thought it might have had something to do with the tab bondings.

twisting makes it better but does not cure it. I assume they have damaged it. Oh well I am sure I can get something back for the T-com, main board, power supply and inverter boards.

If possible can you save the diffuser sheets from the LCD panel in case someone, or myself, needs them to repair mura?

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

yeah can do.

Im gutted that I managed to get rid of the black lines by playing with the tab bond but then when I put it all back together it resulted in a solid thick black line.

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

diffuser sheets are out. I will try and find something to store them in.

[tom66]

Re: Samsung LE-46M86BD Picture Issues

diffuser sheets are out. I will try and find something to store them in.

You can probably roll them up and store them in a cardboard tube. How many were there? There is usually a light guide plate (thick 2mm-3mm plastic), a prism film or two (very effectively amplifies light), and a few diffuser sheets. Cheaper LCDs omit a few diffuser sheets and the prism film. You can probably get rid of the light guide plate. It's a nice lens though.

[retiredcaps]

Re: Samsung LE-46M86BD Picture Issues

Jeez no one mentioned this yet????

2 hours of soldering yesterday even with a fan blowing doesn't help my brain function.

At least I got one power supply recapped and got a few spare components from desoldering something else.

[Jasgriff]

Re: Samsung LE-46M86BD Picture Issues

2 hours of soldering yesterday even with a fan blowing doesn't help my brain function.

At least I got one power supply recapped and got a few spare components from desoldering something else.

You seem to have a few bits to work on recently!

Tom,

I have kept the sheets and will try to get a tube to store them in ready for shipping if needed. I will also try and pick up something to fix whilst dumping the remainders of this tv.