Multi colours on Samsung LE40M86BDX.

[Dang]

As you can see from the pictures it's just all over the place, my guess is a T-con problem. I've already been in the service menu but nothing is making any real difference at all.

The second picture shows bad image retention.

[wreksta]

Re: Multi colours on Samsung LE40M86BDX.

power tv off then press info,menu,mute,power tv wil start with service menu find reset on main screen or in option press ok on this
do not touch anything else

see if this sorts it out

[Dang]

Re: Multi colours on Samsung LE40M86BDX.

Tried that yesterday, no difference, tried different screen size, different screen type etc, all had very little if any effect.

[wreksta]

Re: Multi colours on Samsung LE40M86BDX.

replace tcon I would think or feel heatsink on av main if its burning hot I would say its that

[freakaftr8]

Re: Multi colours on Samsung LE40M86BDX.

That's a tcon issue. More specifically on the tcon there is a gamma IC. AS15-F or G or thereabouts. It may be bad.

[budm]

Re: Multi colours on Samsung LE40M86BDX.

Gamma issue on the T-CON board.
http://www.shopjimmy.com/catalogsear...ung+LE40M86BDX

MAX9590:
http://www.maximintegrated.com/datas...ex.mvp/id/5135

https://cdn.badcaps-static.com/pdfs/...b12aa79458.pdf

[multimeter]

Re: Multi colours on Samsung LE40M86BDX.

yep,gamma issue,continued use will most likely cause it to go to a "negative" like a photo negative.

replace t-con, for piece of mind,try reseating lvds cable,clean contacts with iso alcohol,at both ends,just to rule it out,99% sure gamma proccesor has though

[tom66]

Re: Multi colours on Samsung LE40M86BDX.

You can check gamma voltages to confirm if IC is bad or not, but it looks bad to me.

[RJARRRPCGP]

Re: Multi colours on Samsung LE40M86BDX.

Reminds me of re-installing Windows, with pre-XP versions of Windows, LOL.

[Maxstang]

Re: Multi colours on Samsung LE40M86BDX.

Why do the better manufactures use these chips. It seems they have a terrible failure rate. I just replaced one in a 46" Samsung. Picture is till inferior to my 2007 model.

[tom66]

Re: Multi colours on Samsung LE40M86BDX.

Probably a matter of not knowing about the high failure rate.

[Dang]

Re: Multi colours on Samsung LE40M86BDX.

OK, so the T-con board has the notorious AS15-F gamma chip installed, I've found a replacement board at £50 which is just extortionate so I'm going to try and replace the chip, I can get the chip here: http://www.ebay.co.uk/itm/AS15-F-AS1...item1e800bfea1. Now I've never changed a chip like this before but for £2.50 it's worth a go as it's certainly better than £50, all I really want to know is what I need and how best can I do this in the home? I don't mind spending a few pounds on some extra equipment but of course I'm wanting to keep it as cheap as I can, thanks as always, Andy.


I should add: there is no heat sink pad in place so I shall add one after the repair.

[T-con]

Re: Multi colours on Samsung LE40M86BDX.

My experience after replacing an as15 chip, the broken chip heats a lot (using my finger) but with the new chip its cold, before i was planning to put a heat sink but realized its not the overheating that cause the failure, maybe bad manufacturing or design?

[budm]

Re: Multi colours on Samsung LE40M86BDX.

Your T-CON board is for AUOPTO LCD panel, you must not have the same version as shown at Shopjimmy, the T-CON as shown at SJ uses IC MAX9590.

[Maxstang]

Re: Multi colours on Samsung LE40M86BDX.

I just did this swap yesterday. I'll post a guide. In short, if you don't have a hot air station (like I don't), I recommend a rework product called Chipquik. It's an alloy you reflow over the part you want to remove like solder. It mixes with the solder already on the part and lowers it's melting temperature enabling you to keep all the traces melted at once and pull the part easily.

[Dang]

Re: Multi colours on Samsung LE40M86BDX.

Thanks for the help guys, agreed on the gamma chip, I managed to get a replacement T-con and all is well, total cost just £28, can't complain, Andy.

[triplerotor]

Re: Multi colours on Samsung LE40M86BDX.

Hi All

I have an LE40M86 with exactly the same issue, powers up with a good picture then after 20 seconds the picture starts to saturate until eventually we get the full psychedelic effect.

I tried the service menu changes and reseated the LVDS connectors but no difference so hopefully a t-con swap will do the trick. One thing I did notice is that the teletext image is unaffected, always sharp with the correct colours... does that help confirm that its not a main board problem?