Solarized picture on Samsung UN65ES8000F TV

[dskall]

Re: Solarized picture on Samsung UN65ES8000F TV

Your first board looks like a fail. The second has good gamma chip. Not sure what is causing problem with second board. If you feel brave you can swap chips which should fix problem. If you have never done it can easily destroy board. I know I have destroyed a few now.

[nartac]

Re: Solarized picture on Samsung UN65ES8000F TV

Thank you Davi.p. I appreciate your time

[nartac]

Re: Solarized picture on Samsung UN65ES8000F TV

Your first board looks like a fail. The second has good gamma chip. Not sure what is causing problem with second board. If you feel brave you can swap chips which should fix problem. If you have never done it can easily destroy board. I know I have destroyed a few now.

Yes, that would be my last and cheaper option before shelling out money to buy a used but expensive board.

[Davi.p]

Re: Solarized picture on Samsung UN65ES8000F TV

Lastly, yesterday i have seen many good youtube videos about.. search for QFN soldering.. bye...

[nartac]

Re: Solarized picture on Samsung UN65ES8000F TV

Wait... i have some bad feelings about it... i've noticed that spot of paint on it.. this says usualy that is a programmed chip, then a replacement one is not good as it is virgin and is difficult to program (need probably a custom software), i search for datasheet and then i let you know...

EDIT: no datsheet, but i too have bad news for you... 3 things let me understand that is a programmed chip, 1 the paint, 2 it has too few pins, 3 i see 2 testpoints called SDA, SCL and since it has a i2c communication is a programmed chip. So the only chances is to: grab the chip from the other board (ooh.. now it comes that you are right... :-), buy a new (used or not used board)...

I can't thank members of this forum enough expecially Davi.p and dskall for taking your precious time to help me. I think I have some low melt desolder wire and will attempt to remove the gamma chips and exchange them.

[Davi.p]

Re: Solarized picture on Samsung UN65ES8000F TV

Don't worry, it's an hobby for me, i go here first of all to understand better electronics.. comfortably sat on a chair..!

[piernov]

Re: Solarized picture on Samsung UN65ES8000F TV

You can probably dump the firmware of the good chip with an RT809F and flash it onto a new one. However an RT809F is more than $40 so if you don't have it or need it, don't bother.

In order to swap those chip, you'll need a hot air gun, some flux, leaded solder and solder wick. Do not try anything if you do not have this equipment, you'll destroy the board.
If you have the equipment but never tried to solder/desolder QFN, try on a scrap board first.
It is very easy to rip the pad off of the board.

[nartac]

Re: Solarized picture on Samsung UN65ES8000F TV

Just want to update with you guys regarding my problem. I also want to expression my deepest appreciation with all the help you all have given.

It took me awhile due to purchasing some items from China. I have always wanted a hot air station but since I don't use it often, I bought an el cheapo china made 858D from Ebay which cost me about $30 shipped. Only read some reviews on these hot air stations and they had problem with the internal wiring where the live wire was going directly to the board and not through the fuse and the metal part of the blower was not properly grounded. A little swapping wires and soldering fixed the problem and made safer. I then practiced removing some transistors from a bad computer video card after watching a bunch of youtube videos on how to remove smd. One mistake I made initially was I used the smallest nozzle which was about 4mm in diameter and it took quite a long time to remove one transistor. Then I decided to try the medium nozzle which measures about 8mm and it was perfect. I warmed up the board holding the nozzle arout 3-4 inches from the board for about a minute then move closer in a circular motion to about an inch or so and was able to remove the transistor within a minute or so. I was very excited. Then it was a matter of waiting for solder paste to come which just arrived today.

As you can see, I had some bridging initially with the soldering paste but using a soldering iron quickly fix the problem. As a result, it works as you can see. I realize that my soldering skills need improvements still but I think it did the job.

Again, thanks guys for helping me getting my Samsung alive again.

[dskall]

Re: Solarized picture on Samsung UN65ES8000F TV

Nice job. I blew a resistor off on my try and had to get another board. I should have done a lot more practicing before attempting the real thing. It's harder than it looks. Glad you got a working tv. Now you need another so you can get your money out of hot air station.