Samsung LN40B530P7n solarized image and ghosting

[davekra]

I thought I'd get a thread started for this TV since I'm bored at work.
The initial problem was a solarized display but the menus looked ok. The test patterns within the service menu looked ok but I think the colors were off on those as well.

The gama voltages had some spikes and dips across the 22 test points so I replaced the AS15-f. The results are the display is very white and the menus that were black are now white as well. The new chip gets quite hot as well.

I've got a few more AS15's on order since they're cheap and somewhat easy to replace to see if I may have gotten a bad one but are there any tests to be done on the main board to see if it's sending the correct voltage/signal?
The main board tests seem to be more a process of elimination.

I'll add some pics tonight when I get home.

Thanks,
davidk

Mainboard BN96-11779a
T-con board FX-6640T02C03-92L-0000NIP-00767-06

[davekra]

Re: Samsung LN40B530P7n solarized image and ghosting

So, I'm guessing the solarized/negative image is the t-con AS15 chip. The one I just put on gets real hot and the voltages are way off so either it was bad to begin with or I damaged it durring installation. As I said I've got a few more coming and will try them and see what we get.

The vertical lines are a little conserning. I'm hoping you guys say it could still be the t-con board.

Thanks for looking.
davidk

[tom66]

Re: Samsung LN40B530P7n solarized image and ghosting

I have seen repeated vertical lines caused by gamma IC (where other faults also existed.) However, do not run the TV for too long, it is plausible, although unlikely, that bad gamma chip could cause issues with LCD panel driver chips which if they fail, would ruin the panel.

[davekra]

Re: Samsung LN40B530P7n solarized image and ghosting

Roger that. I only had it on enough to test voltage and take pics. Hopefuly it will be ok.
It'll take a couple weeks to get the new chips so till then I'll just cover it up so it doesn't get dusty with the woodworking I need to do.

Thanks,
davidk

[davekra]

Re: Samsung LN40B530P7n solarized image and ghosting

Whoo hoo!
I got several more AS15 in the mail today and went right to work removing the old one from the board.
Cleaned everything up and was careful soldering the new one on. The first time with the old chip I had several times where too much solder was used and bridged a couple pins. I thought I'd cleaned it up well enough but in hindsight probably not.
This time I was extremely careful and had only one case where solder bridged pins.
Using a 10x loupe I saw where the pins bridged there was solder still bridging them even after using the wick.
A new xacto blade took care of it and I was rewarded with a working TV.

Another working TV with the help of this outstanding forum.
Thanks for the help and for listening.
davidk

[budm]

Re: Samsung LN40B530P7n solarized image and ghosting

Great works and thanks for the repair follow-up.