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UE40C6800 -> Board BN41-01444B -> Changed "Dnie"-BGA, nothing working anymore

Posted: Wed Oct 05, 2016 8:48 am
by Torbes
Hello Forum,

this is my first post, so I hope doing it all correctly and you understand my problem.

I have a Samsung UE40C6800 TV-Set, which has the known Problem with the "Dnie"-BGA (Mstar-BGA) with broken/interrupted solderballs.

Board-Type: BN41-01444B.

The Picture was corrupted, but the TV was working so far.

As i got the opportunity to change a bga with a professional bga-station, i ordered a new bga from china, and replaced the old one with that fresh...

Type and writings of that bga are exactly the same... Soldering on the bga-station is completely automatic, so the replacement should be perfect.

But my problem is:

The tv is just power cycling.... No Picture, no light, no sound... Just booting, turning off, booting again...

So my question: is it possible, that this BGA must be preprogrammed or flashed before using?

How, when needed, can this be done? Are there Jtag-Pins etc?

Sorry, but i am a very beginner on these tv-Sets...

Thank you for spending your time and trying to help me :-)

Cheers, Tob!

Re: UE40C6800 -> Board BN41-01444B -> Changed "Dnie"-BGA, nothing working anymore

Posted: Wed Nov 02, 2016 7:06 pm
by beatfreak
swapping bga chips is still a lot of thermal stress for the whole board, if only the solderballs were broken a reflow / resolder of the old chip might be the better option,

get a uart connector and grab a bootlog from exlink port (pin 11 in vga connector iirc)