SAMSUNG LN40B530P7N bad TCON?

[triplefour]

please tell me this is bad TCON...
when i bought the TV for 10 dollars, i could see the display on the tv, change channels, inputs, use the menu, everything was fine, it was just wayyy brighter than it should have been.

when i got it home and turned it on it looked like this:
http://youtu.be/KhpHp311vGM

now after messing with the tcon its pretty much just entirely a white screen with just the hint of the menu.

i tried unplugging one side at a time and this is where its left me.
in my mind because its affecting the entire screen, im thinking its likely a bad tcon. or am i just being hopeful and its a bad panel?

[wreksta]

Re: SAMSUNG LN40B530P7N bad TCON?

that definatley sounds like the tcon does it start normal with a good image then go really bright to an almost white mate

[triplefour]

Re: SAMSUNG LN40B530P7N bad TCON?

no it doesnt start normal at all anymore just straight to almost white...

[tom66]

Re: SAMSUNG LN40B530P7N bad TCON?

It doesn't look like a panel fault.

It could be T-con or main. If you do ever get the menus back, there is a quick test to see which is bad.

Put TV into standby

Then on remote press MUTE, 1, 8, 2, and finally POWER.

Access Control > Test Pattern.

You have three pattern selections (press left/right to move through each pattern, up/down for each generator):
- FBE Pattern Sel: This is the main board pattern generator, the OSD is added on top.
- FRC BeforeDDR: This pattern is generated on the t-con before the FRC converts the video (50Hz -> 100Hz, etc.)
- FRC AfterDDR: This is after the DDR is used to process the video for the FRC.

If the fault exists only on FBE Pattern Sel: main board
If it exists on only the BeforeDDR or AfterDDR: t-con board

Possibly, if you can narrow it down to Before/AfterDDR you could identify exact t-con fault.

Otherwise, you will have to try one (I would try main board first) and if not, the other.

[tom66]

Re: SAMSUNG LN40B530P7N bad TCON?

...Wait, what on the T-con did you mess with?

[triplefour]

Re: SAMSUNG LN40B530P7N bad TCON?

nothing major just unplugging/ replugging connectors...
*sigh* all the TCON i can find for sale are around 40$ ...even the repair kit is 20...
hope i can get the menu up to tell for sure, but if i cant, is there any other way to diagnose the tcon by itself? on another TV i had
https://www.badcaps.net/forum/showthread.php?t=38097
glitcher had me test the VGAMMA pins...and then alastair said it was the gamma ref chip.
suppose ill try that same test here...
i still havent the skill or tools to solder such small chips though. need to work on that!

[triplefour]

Re: SAMSUNG LN40B530P7N bad TCON?

the vgamma readings seem way different than on the other TV. but if theyre supposed to be going down in 1 to 1.5v increments, theyre certainly not doing that. all but 2 of the pins are at 15.9v one of them is 14.something and another is 12.something
if i do order a new tcon board, does it have to be exactly the same, or is there some room for mixing and matching? i think $20 for a tcon should be about right...the prices people want to charge for these parts is not leaving much meat on the bone!

[tom66]

Re: SAMSUNG LN40B530P7N bad TCON?

You paid $10 for the TV and complain about a $40 T-con...? I -wish- I had prices like that here. Normally I'd buy a TV for $50 (£35)

It sounds like your gamma chip is bad. BUT you will have the original issue too. The $20 repair kit is a rip off, the chip is $5.

Did you unplug/plug in while the set was live?

[triplefour]

Re: SAMSUNG LN40B530P7N bad TCON?

no i dont think i tried that...is it safe to go around unplugging and replugging in boards while the tv is on??

what do you mean that i will have the original issue too?

i dont mean to complain i just wish if people wouldnt ask so much for the parts then more tvs could be saved!

[tom66]

Re: SAMSUNG LN40B530P7N bad TCON?

is it safe to go around unplugging and replugging in boards while the tv is on??

Usually not, I wouldn't advise it. Was just checking that you had not.

what do you mean that i will have the original issue too?

The scrambled screen. Bad gamma IC would not cause that...

[triplefour]

Re: SAMSUNG LN40B530P7N bad TCON?

oh?? dang..then i have/had a motherboard problem as well?
another reason i wouldnt want to spend 40 for a TCON only to find out i have to buy a motherboard too!

i havent been able to make it do that crazy pattern for a while now though. its just almost pure white. i can just barely make out the menu screen and channel screens but i cant read any words. i hooked up my n64 and the sound comes thru when i change to the right source, but without seeing a clear picture, i cant say the motherboard is good? only the power supply and inverter?