Samsung LN40B530P7N Picture Issue

[imadunatic]

I've combed through the relevant guides and posts and I'm pretty sure I'm looking at a failed tcon board. This isn't the infamous AF15G, so I'm leery to jump to the conclusion that this is the problem. It started with horizontal lines of all colors scrolling up and down the black areas of the screen, then I started to get some inversion (not sure what to call it, looked like a negative of the picture) and now I just have horizontal lines scrolling up and down the screen. You can still watch the tv, but the black areas all have these lines and the picture itself is much less than great. On a blank no input screen, it is all scrolling lines and all behind the menus. The IC on my tcon board is AS19H1G.

Any help is greatly appreciated.
Thanks
Kevin

[imadunatic]

Re: Samsung LN40B530P7N Picture Issue

Further research leads me to believe that the tcon is ok given that my menus are fine. I've checked all analog and digital inputs and I get the same thing.

Is it possible that it's the main board? Any way to test these without a scope?

[Andrew F. Ali]

Re: Samsung LN40B530P7N Picture Issue

I would say Main Bd since you can get the OSD showing OK or normal. I think the way to check this is with a scope to determine if the LVDS signals are being generated from the Main Bd and reaching the T-CON Bd since it could be a LVDS ribbon cable problem, too.

[imadunatic]

Re: Samsung LN40B530P7N Picture Issue

I'm getting a fairly loud buzzing/whining sound from the t-con, I'm not sure if a faulty mainboard would cause this or if this is a sign of a bad t-con board. Given the lack of availability on the mainboard, I think I'm going to gamble on the t-con and see what happens. The fact that menus are working fine concern me, but this buzzing sound certainly isn't right either.

[imadunatic]

Re: Samsung LN40B530P7N Picture Issue

So I took the plunge and ordered a new T-conn board from Ebay.... Ironically, my picture looks like this now (classic T-conn board symptoms from what I gather). I reinstalled my board just to be sure I was seating cables properly, etc and it still exhibits the same symptoms as before.... In my simple mind, beings that the symptoms changed, I found the problem (or part of it), now it's just a matter of getting a good part.....?

[Shinju]

Re: Samsung LN40B530P7N Picture Issue

Well hold up, that might need to be a panel adjustment in the service menu.

TV off, MUTE and press 1 8 2 and power on the remote.

There should be a setting in Option Byte with the LVDS options PDP, JEIDA, VESA. (also make sure to have something playing in the background on HDMI 1) helps you see the changes made if any.

write down your settings before changing anyting once you change something you cannot go back (factory reset) you are programing your panels EEPROM. If you go back and set it to what you had before that will work.

If the VESA deal doesn't work try changing the panel type if you can.

[budm]

Re: Samsung LN40B530P7N Picture Issue

Can you take some VGMA Voltage readings on the test points of the T-CON board?

[tom66]

Re: Samsung LN40B530P7N Picture Issue

I don't think this is a gamma fault myself.

[imadunatic]

Re: Samsung LN40B530P7N Picture Issue

You sirs are geniuses... I have poured over many of your posts in my research and sure enough, Shinju was right. I really appreciate you taking the time to help out a lowly troll/leach/knowledge seeker.

Also, I'd like to note that I don't have the common failure chip (I believe the common failure is an AS15). My particular IC is a AS19-H1G. Google didn't bring up many of these as being a problem child, but their ebay-availability leads me to believe that these fail also.

Thank you again.
Kevin

[budm]

Re: Samsung LN40B530P7N Picture Issue

Glad to hear, so what setting did you end up with the LVDS setup?

[imadunatic]

Re: Samsung LN40B530P7N Picture Issue

My particular settings was in "Control" ----> "Sub Option" -----> "LVDS Format" and it had to be set to VESA.

[budm]

Re: Samsung LN40B530P7N Picture Issue

Thanks, I will have to experiment with those settings one of these days.