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I have two genuine S107G models which are fitted with 'yellow' boards. These connections may be different for those fitted with the 'red' board .
Board markings are: S107R5 SMLBH.
Board connections are:
With board laying flat, component side up and connections to the left ie switch on top side:
Going downwards:
1. Battery Positive is a thick red lead
2. Front rotor motor positive - a thin red lead together with Rear rotor motor positive - a thin white lead
3. Tail motor negative - a very thin blue lead
4. Tail motor positive - a very thin red lead
5. Rear rotor motor negative - a thin black lead
6. Front rotor motor negative - a thin blue lead
7. Battery negative is a thick black lead
The battery and motor positive connections are joined on the underside of the board. This suggests that the motors are driven via negative voltage levels.
I hope this is clear and useful to those brave enough to strip and repair these excellent little machines.
Here's the thing with fakes and real helis--it really does not matter. If it flies, it flies, if it dies, it dies. Nobody should be worried about fake helis, since they aren't really a problem to fix. Only issue being if they were from longer than Amazon's return policy, (where if it breaks in the first however long like the fakes do, just swap it out for one from Amazon) then you just have to replace one motor when it blows. If you already have a soldering gun, or know somebody with one, it's not a problem in the least.
I just recived my new 107 and the bord is yellow on that aswell
thanxs for the reply. it does fly nice so im happy with it.
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I think the main thing to consider is if the heli flies ok, it might be a clone, which is ok too, Syma are using different products from other supplies, no I can not prove that but makes sense to me the are Constancy upgrading
"Fly like a butterfly sting like a Syma" http://syma107.com
hi im new to the syma107 site and just bought my first heli 
but the motherboard is yellow? ut us marked s107r5 on the board and the light is green. the model i bought is a yellow body so is that why my motherboard is yellow? it flys great so no problems there. thanx for reading and i appreciate all responses , ok maybe the board is tan, srry
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