samsung 40 in lcd can i ruin panel???

[mattstolte]

I recived this lcd and the color was messed up so I ordered a new chip that was on ebay for this tcon well I tried to solder it and messed it up, then I ordered another tcon and whole screen is white now. wondering is it possible I could of damaged the panel? then I put the other tcon back in and I seen alittle color but was white also, but seen some color but the tcon I got off ebay no color

[tom66]

Re: samsung 40 in lcd can i ruin panel???

There is the chance, but it is unlikely.

[steviewonder]

Re: samsung 40 in lcd can i ruin panel???

probably a duff board you have been sold..notably the as15f ic..if this gets hot rather quickly,then there's the fault.

[vinceroger69]

Re: samsung 40 in lcd can i ruin panel???

with the new tcon in have you tested the gamma voltages are they good or bad?

[mattstolte]

Re: samsung 40 in lcd can i ruin panel???

with the new tcon in have you tested the gamma voltages are they good or bad?

i dont know how to test them could you guide me with this please? would help for future reference i have been learning alot lately, and would like to know how to do this because i been been running into errors miss diagnosing tvs because of this, thanks

[tom66]

Re: samsung 40 in lcd can i ruin panel???

There are guides all over this forum - you just need to locate the gamma points (VG#, GAMA#, etc.) and test them. Report the readings you get.

[mattstolte]

Re: samsung 40 in lcd can i ruin panel???

tom I see vgma1-vgma22 I need to test all these? and how can I find out on my own for future reference on the readings? I will I know if there good or not? basically im asking what all do I need to know how to test a tcon?

[budm]

Re: samsung 40 in lcd can i ruin panel???

Example:
https://www.badcaps.net/forum/showth...gamma+voltages
https://www.badcaps.net/forum/showth...ht=LN40B530P7N

[tom66]

Re: samsung 40 in lcd can i ruin panel???

Basic principle with gamma voltage curves is "monotonicity". The voltages should go either up or down, but not both. i.e. not up, down then up again, that is a fail. Almost all bad ICs fail this test.

They also should range from 0 to about 15V, sometimes a little lower or higher, but no lower than 14V or higher than 18V. Some bad ICs will get have half the voltages low, other half good. That means the IC is bad and needs to be replaced.

More complicated test is symmetry. The voltages should mirror themselves around the centre point of half the highest voltage. i.e. if the highest voltage is 15V, then you should be able to draw a virtual mirror around 7.5V and the voltages will be in the same "curve". Excel helps here!